Re: X axis DRO, my next project
Aargh!??I meant Z axis, parallel to the bed.??That's what I get for getting involved in a project too late at night, LOL.?
Chris, that's a nice setup you've got there. That looks great for doing extremely precision work. Definitely something to keep in mind but for what I'm doing it would require a lot of install and removal.?
I looked at the iGaging absolute stainless but they're a bit more than I want to spend and I'm not sure there's any advantage to the "absolute" feature on lathe Z axis???They do have an input for a power transformer so that would eliminate batteries.? ?Is there something there I'm not thinking of in regards to the absolute feature?
That's what led me to the Shars ones. A bit more affordable and stainless but I'm not seeing much around the web about them. I'm fairly set on stainless scales as they seem to be less problematic than aluminum even if they are almost 2x the cost.
On Mar 23, 2022, 3:02 PM -0400, Chris Albertson <albertson.chris@...>, wrote:
If you want "simple".? ?You can attach an iGauging" type DRO with magnets.? Glue the magnets to the DRO scale.? ? ? This is not a lot different from placing a magnetic base on a dial indicator.?
On Wed, Mar 23, 2022 at 11:23 AM plumbfishy via <seversonplumbing= [email protected]> wrote: Hi Ryan,
I opted for the "poor mans DRO"on the X axis of my lathe. I made up a simple clamp that allow me to use a 2" dial indicator against the carriage to measure travel. Cheap and easy to install/remove as needed. No batteries to wear out and no electrical interference. Granted, it's only 2" of travel, but it's easily adjusted and seems to be adequate for most jobs I do.
![]()
Attachments:
--
Chris Albertson
Redondo Beach, California
|
Re: Mini Lathe - Mini Mill
The fignoggle?split delrin nuts do take out most of the backlash. What is left is the play in the x axis bearings, and the y steel on steel. Some of that can be taken out with the handwheel nut adjustment. You can get it down to just a couple of thousands, but I can't get it all out. I've made a lot of stuff on the mill and the little bit of backlash hasn't been a problem. I would probably switch it over from the metric screw to the SAE screw if it came with the adjustable split nuts.?
Floyd
The /g/Mini-Mills/topics
doesn't show any activity since September of 2021.
On 3/23/2022 10:00 AM, Floyd Burkett
wrote:
Went to that mini-mill forum and I'm a member. So I
sent a test notification to my browser and didn't get it. I
guess I need to play with it a bit until I get the
notifications.
My mill has the Fignoggle adjustable nuts on the lead
screws so it actually has very little backlash. I also have
DRO's on all the axis. I just wondered if it would be worth
the effort to change out the lead screws. Thanks for the heads
up on that forum.
Floyd
I?
own a Micro-Mark benchtop mill and it came with Imperial lead
screws and nuts.? Of course it had backlash -- all feed screws
of this type do -- but it's been very usable.? The X axis is
better than the Y axis because it has thrust bearings while
the Y axis is a steel-on-steel, friction-prone affair.? You're
forced to balance the effort to turn the handwheel vs. how
much backlash you have.?
The mini-mill forum can be found here: /g/Mini-Mills/topics.?
-Mark
|
Re: Mini Lathe - Mini Mill
The /g/Mini-Mills/topics
doesn't show any activity since September of 2021.
On 3/23/2022 10:00 AM, Floyd Burkett
wrote:
toggle quoted message
Show quoted text
Went to that mini-mill forum and I'm a member. So I
sent a test notification to my browser and didn't get it. I
guess I need to play with it a bit until I get the
notifications.
My mill has the Fignoggle adjustable nuts on the lead
screws so it actually has very little backlash. I also have
DRO's on all the axis. I just wondered if it would be worth
the effort to change out the lead screws. Thanks for the heads
up on that forum.
Floyd
I?
own a Micro-Mark benchtop mill and it came with Imperial lead
screws and nuts.? Of course it had backlash -- all feed screws
of this type do -- but it's been very usable.? The X axis is
better than the Y axis because it has thrust bearings while
the Y axis is a steel-on-steel, friction-prone affair.? You're
forced to balance the effort to turn the handwheel vs. how
much backlash you have.?
The mini-mill forum can be found here: /g/Mini-Mills/topics.?
-Mark
|
Re: Mini Lathe - Mini Mill
??? ??? There has to be some way to get rid of most of the back
lash , unfortunately I don't have one of these machines? so I
can't say what I think can be done .
??? ??? animal
On 3/23/2022 12:02 PM, Floyd Burkett
wrote:
toggle quoted message
Show quoted text
Your probably right. I don't use the dial gauge
much anymore anyway, and the change might make the backlash
worse. Onward to the next project. Thanks for the replies
everyone,? I think I'll do some searching on the mini-mill site.
Floyd
On Wed, Mar 23, 2022 at 1:13
PM plumbfishy via <seversonplumbing= [email protected]>
wrote:
Hi
Floyd,
Not having installed that exact kit, I can't say for sure, but
I did install the metric lead screw conversion kit and there
was little to no discernible difference in backlash between
the new and the original. Also, I would think if you already
have DRO's installed it's kind of a moot point anyway?
|
Re: Mini Lathe - Mini Mill
??? ??? Unfortunately I think alot of folks have gone over to FB
groups . Good to see that I'm not the only one holding out? !
??? ??? animal
On 3/23/2022 11:51 AM, Charles Kinzer
wrote:
toggle quoted message
Show quoted text
I finally found that one you mentioned and
it is named ¡°Mini-Mills¡± ag Groups.io.? If you search
groups.io for ¡°mini-mill¡± it shows nothing.? If you search for
¡°mini-mills¡± (with an ¡°S¡±) it shows it.? (Not a very friendly
search engine.)
?
I believe this was a separate group from
the GrizHFMinimill group back in the Yahoo days.? This
Mini-Mills group has far lower membership (only 231 members)
than I remember the GrizHFMinimill group had which I think was
in the thousands and very active.
?
Chuck K.
?
Sent from for Windows
?
?
There is a mini mill group right here in
groups.io but the last message I see in it is from 8/19/2021.
?
Most just post here for mini mill
questions. It¡¯s up to the moderators to control it. I like
having them all together in here. It was pretty much the same
people who are in here. And the ones who wanted to talk CNC
all the time have moved to a CNC group leaving the mini mill
group vacant.
?
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
?
?
?
?
I was wondering where I might find the Mini
Mill forum. I'm not sure this is the forum to discuss the mill
on.?
?
|
Re: X axis DRO, my next project
If you want "simple".? ?You can attach an iGauging" type DRO with magnets.? Glue the magnets to the DRO scale.? ? ? This is not a lot different from placing a magnetic base on a dial indicator.?
On Wed, Mar 23, 2022 at 11:23 AM plumbfishy via <seversonplumbing= [email protected]> wrote: Hi Ryan,
I opted for the "poor mans DRO"on the X axis of my lathe. I made up a simple clamp that allow me to use a 2" dial indicator against the carriage to measure travel. Cheap and easy to install/remove as needed. No batteries to wear out and no electrical interference. Granted, it's only 2" of travel, but it's easily adjusted and seems to be adequate for most jobs I do.
Attachments:
--
Chris Albertson
Redondo Beach, California
|
Re: Mini Lathe - Mini Mill
Your probably right. I don't use the dial gauge much anymore anyway, and the change might make the backlash worse. Onward to the next project. Thanks for the replies everyone,? I think I'll do some searching on the mini-mill site.
Floyd
On Wed, Mar 23, 2022 at 1:13 PM plumbfishy via <seversonplumbing= [email protected]> wrote: Hi Floyd,
Not having installed that exact kit, I can't say for sure, but I did install the metric lead screw conversion kit and there was little to no discernible difference in backlash between the new and the original. Also, I would think if you already have DRO's installed it's kind of a moot point anyway?
|
Re: Mini Lathe - Mini Mill
I finally found that one you mentioned and it is named ¡°Mini-Mills¡± ag Groups.io.? If you search groups.io for ¡°mini-mill¡± it shows nothing.? If you search for ¡°mini-mills¡± (with an ¡°S¡±) it shows it.? (Not a very friendly search engine.) ? I believe this was a separate group from the GrizHFMinimill group back in the Yahoo days.? This Mini-Mills group has far lower membership (only 231 members) than I remember the GrizHFMinimill group had which I think was in the thousands and very active. ? Chuck K. ? Sent from for Windows ?
toggle quoted message
Show quoted text
From: Michael JablonskiSent: Wednesday, March 23, 2022 11:35 AM To: [email protected]Subject: Re: [7x12MiniLathe] Mini Lathe - Mini Mill ? There is a mini mill group right here in groups.io but the last message I see in it is from 8/19/2021. ? Most just post here for mini mill questions. It¡¯s up to the moderators to control it. I like having them all together in here. It was pretty much the same people who are in here. And the ones who wanted to talk CNC all the time have moved to a CNC group leaving the mini mill group vacant. ? Michael - California, USA Micro-Mark MicroLux 7x16 LMS 3990 Hi-Torque Mill with power feed ? ? ? ? I was wondering where I might find the Mini Mill forum. I'm not sure this is the forum to discuss the mill on.? ?
|
Re: X axis DRO, my next project
I did smoothing?similar years ago, but I only had a 1-inch travel dial indicator.. What I have found to be really useful in conjunction with the dial indicator is an adjustable stop between the carriage and the head stock. By the way, I get the best finish by hand-feeding toward the head stock and power feed toward the tail stock. Regards, John Mattis
On Wed, Mar 23, 2022 at 11:23 AM plumbfishy via <seversonplumbing= [email protected]> wrote: Hi Ryan,
I opted for the "poor mans DRO"on the X axis of my lathe. I made up a simple clamp that allow me to use a 2" dial indicator against the carriage to measure travel. Cheap and easy to install/remove as needed. No batteries to wear out and no electrical interference. Granted, it's only 2" of travel, but it's easily adjusted and seems to be adequate for most jobs I do.
Attachments:
|
Loads fine here too.
It's a shame that if you wanted yet another O-scope you'd have to move into a larger shop space. ?
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of WAM Sent: Wednesday, March 23, 2022 11:16 AM To: [email protected]Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor Loading for me here in north VA On 3/23/2022 11:32 AM, Johannes wrote: WAM ; Do you have problem with your web?
I have tested you With different browsers
Hmm. We¡¯re having trouble finding that site.
We can¡¯t connect to the server at www.ajawamnet.com.
Sendt fr? E-post for Windows
Fr?:WAM
Sendt: onsdag 23. mars 2022 07:38
Til: [email protected]
Emne: Re: [7x12MiniLathe] LMS 5200 Lathe motor
I have the Consew on multiple machines - my CNC and my Deckel clone:
On the one I have - the CS1000 - I know to reverse it you need to go
thru the set up menu.
Lot's of torque at any speed... nice and even
On 3/22/2022 10:25 PM, Jon Rus via groups.io wrote:
Ralph,
How do you like the motor performance? Do you have continuous
(0%-100%) analog speed control? What did you do for your mounts and
belt drive interfaces?
.
I was looking at this pretty closely
Mini Metal Lathe 1 hp Servo Motor 115V 750W Kit 2 speed Grizzly
Harbor Freight | eBay
<
2ndiE52l>
.
.
TIA for your thoughts
On 3/22/2022 8:47 PM, Ralph Hulslander wrote:
I have the Consew Brushless 3/4
<
w~gRVmWce>hp motor on my lathe, my mill and my bandsaw and I have a
spare.
Ralph
On Tue, Mar 22, 2022 at 8:16 PM mike allen <animal@...> wrote:
if you don't mind making a new motor mount you can use a
treadmill motor & controller , that will give you variable speed .
animal
On 3/22/2022 3:23 PM, Johannes wrote:
Hi group
I have a 5200 LMS lathe, and I think the motor is gone.
It need a manual twist to run and the motor make a lot of noise.
Sometimes ago the motor make a lot of noise, and I took out the
rotor.
The axel under the bearing was very worn, I did something and it
has worked ok until today.
A new LMS 4145 500 Watt Brushless DC motor will cost me
350/400 USD.
So before I order, I ask my group :
*_is it possible to get a new motor that can replace and fit to
my 5200 lathe ?_*
350/400 USD Is nearly 1/3 of a new lathe :-)
If someone have some experience with this motor or similar , you
are welcome to give me some advice.
Best regards
Johannes
Mexico
|
Re: Mini Lathe - Mini Mill
There is a mini mill group right here in groups.io but the last message I see in it is from 8/19/2021. ? Most just post here for mini mill questions. It¡¯s up to the moderators to control it. I like having them all together in here. It was pretty much the same people who are in here. And the ones who wanted to talk CNC all the time have moved to a CNC group leaving the mini mill group vacant. ? Michael - California, USA Micro-Mark MicroLux 7x16 LMS 3990 Hi-Torque Mill with power feed ? ? ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of Floyd Burkett Sent: Wednesday, March 23, 2022 7:31 AM To: [email protected]Subject: [7x12MiniLathe] Mini Lathe - Mini Mill ? I was wondering where I might find the Mini Mill forum. I'm not sure this is the forum to discuss the mill on.?
|
Re: X axis DRO, my next project
Hi Ryan, I opted for the "poor mans DRO"on the X axis of my lathe. I made up a simple clamp that allow me to use a 2" dial indicator against the carriage to measure travel. Cheap and easy to install/remove as needed. No batteries to wear out and no electrical interference. Granted, it's only 2" of travel, but it's easily adjusted and seems to be adequate for most jobs I do. 
|
Loading for me here in north VA
toggle quoted message
Show quoted text
On 3/23/2022 11:32 AM, Johannes wrote: WAM ; Do you have problem with your web?
I have tested you With different browsers
Hmm. We¡¯re having trouble finding that site.
We can¡¯t connect to the server at www.ajawamnet.com.
Sendt fr? E-post for Windows
Fr?:WAM
Sendt: onsdag 23. mars 2022 07:38
Til: [email protected]
Emne: Re: [7x12MiniLathe] LMS 5200 Lathe motor
I have the Consew on multiple machines - my CNC and my Deckel clone:
On the one I have - the CS1000 - I know to reverse it you need to go
thru the set up menu.
Lot's of torque at any speed... nice and even
On 3/22/2022 10:25 PM, Jon Rus via groups.io wrote:
Ralph,
How do you like the motor performance? Do you have continuous
(0%-100%) analog speed control? What did you do for your mounts and
belt drive interfaces?
.
I was looking at this pretty closely
Mini Metal Lathe 1 hp Servo Motor 115V 750W Kit 2 speed Grizzly Harbor
Freight | eBay
<>
.
.
TIA for your thoughts
On 3/22/2022 8:47 PM, Ralph Hulslander wrote:
I have the Consew Brushless 3/4
<>hp
motor on my lathe, my mill and my bandsaw and I have a spare.
Ralph
On Tue, Mar 22, 2022 at 8:16 PM mike allen <animal@...> wrote:
if you don't mind making a new motor mount you can use a
treadmill motor & controller , that will give you variable speed .
animal
On 3/22/2022 3:23 PM, Johannes wrote:
Hi group
I have a 5200 LMS lathe, and I think the motor is gone.
It need a manual twist to run and the motor make a lot of noise.
Sometimes ago the motor make a lot of noise, and I took out the
rotor.
The axel under the bearing was very worn, I did something and it
has worked ok until today.
A new LMS 4145 500 Watt Brushless DC motor will cost me 350/400
USD.
So before I order, I ask my group :
*_is it possible to get a new motor that can replace and fit to
my 5200 lathe ?_*
350/400 USD Is nearly 1/3 of a new lathe :-)
If someone have some experience with this motor or similar , you
are welcome to give me some advice.
Best regards
Johannes
Mexico
|
toggle quoted message
Show quoted text
On 3/23/2022 2:03 PM, WAM via groups.io wrote: Not quite 3 phase as you know it.
It's a BLDC drive based on the Microchip/Atmel BLDC Sensor-based reference design:
There also are designs that do not use an sensor/encoder and instead uses the back-EMF for BLDC control
More here:
An NXP document on BLDC drive using a quadrature encoder:
ON the LMS BLDC - the encoder is that black thing on the back of the motor that has wires going to it. It's very critical that it is aligned correctly. Usually requires some o'scopes to set up the encoder feedback with the actual drive circuitry.
Some companies like CUI make things to make it easier to align the encoders to the drive's back EMF
- see this vid, it will give a good overview of how much of a pain in the ass it can be to align the encoder, and how their AMT One Touch works:
So yea - technically it's three phase, but it's usually something like a trapezoidal waveform that is locked to either an encoder or reads the back EMF to control voltage and current waveforms through the motor coil
On 3/23/2022 12:37 PM, Chris Wood wrote:
The control board not only changes 120V to 230V, but it makes it 3-phase too. The marvel of electronics, which I do not understand.
The Fault light indicates an error condition. In your case it may be because the motor is not giving reliable feedback of its speed.
Chris
From: [email protected] <[email protected]> On Behalf Of Johannes via groups.io
Sent: Tuesday, March 22, 2022 4:49 PM
To: [email protected]
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
Hi Chris
Nice you are following us on the Group.
I have an electrical question: how do you make 120 V to a 220 V motor? (Just for education!)
The 5200 lathe lamps is for 220 V, so it is difficult to read, but easy to fix.
To day with my broken motor, I see the FAULT lamp is glowing a littlebit.
Can you explain FAULT error ?
/Johannes
Sendt fr? E-post<> for Windows
Fr?:Chris Wood<mailto:chrisw@...>
Sendt: tysdag 22. mars 2022 17:14
Til: [email protected]<mailto:[email protected]>
Emne: Re: [7x12MiniLathe] LMS 5200 Lathe motor
The motors used on the LittleMachineShop.com mini lathes and mini mills are 230V motors.
The motor on Alibaba is a 48V motor. Besides the voltage being correct, be sure to check the physical dimensions.
SIEG makes those motors at their factory in Shanghai so they may not be standard.
Chris Wood
LittleMachineShop.com<>
The premier source of tooling, parts, and accessories for bench top machinists.
396 W. Washington Blvd. #500, Pasadena, CA 91103
(800)981-9663 * Fax (626)797-7934
From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Michael Jablonski via groups.io
Sent: Tuesday, March 22, 2022 4:01 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
I was looking into getting one of these motors for another project a while ago and found this:
<
I¡¯m not sure if it will work, and I did not buy one yet but thought I¡¯d pass this on to you as a possibility.
I wasn¡¯t happy with the replacement cost from either Micro-Mark or LMS.
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Johannes
Sent: Tuesday, March 22, 2022 3:23 PM
To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>
Subject: [7x12MiniLathe] LMS 5200 Lathe motor
Hi group
I have a 5200 LMS lathe, and I think the motor is gone.
It need a manual twist to run and the motor make a lot of noise.
Sometimes ago the motor make a lot of noise, and I took out the rotor.
The axel under the bearing was very worn, I did something and it has worked ok until today.
A new LMS 4145 500 Watt Brushless DC motor will cost me 350/400 USD.
So before I order, I ask my group :
is it possible to get a new motor that can replace and fit to my 5200 lathe ?
350/400 USD Is nearly 1/3 of a new lathe :-)
If someone have some experience with this motor or similar , you are welcome to give me some advice.
Best regards
Johannes
Mexico
|
Re: Mini Lathe - Mini Mill
Hi Floyd,
Not having installed that exact kit, I can't say for sure, but I did install the metric lead screw conversion kit and there was little to no discernible difference in backlash between the new and the original. Also, I would think if you already have DRO's installed it's kind of a moot point anyway?
|
toggle quoted message
Show quoted text
On 3/23/2022 2:03 PM, WAM via groups.io wrote: Not quite 3 phase as you know it.
It's a BLDC drive based on the Microchip/Atmel BLDC Sensor-based reference design:
There also are designs that do not use an sensor/encoder and instead uses the back-EMF for BLDC control
More here:
An NXP document on BLDC drive using a quadrature encoder:
ON the LMS BLDC - the encoder is that black thing on the back of the motor that has wires going to it. It's very critical that it is aligned correctly. Usually requires some o'scopes to set up the encoder feedback with the actual drive circuitry.
Some companies like CUI make things to make it easier to align the encoders to the drive's back EMF
- see this vid, it will give a good overview of how much of a pain in the ass it can be to align the encoder, and how their AMT One Touch works:
So yea - technically it's three phase, but it's usually something like a trapezoidal waveform that is locked to either an encoder or reads the back EMF to control voltage and current waveforms through the motor coil
On 3/23/2022 12:37 PM, Chris Wood wrote:
The control board not only changes 120V to 230V, but it makes it 3-phase too. The marvel of electronics, which I do not understand.
The Fault light indicates an error condition. In your case it may be because the motor is not giving reliable feedback of its speed.
Chris
From: [email protected] <[email protected]> On Behalf Of Johannes via groups.io
Sent: Tuesday, March 22, 2022 4:49 PM
To: [email protected]
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
Hi Chris
Nice you are following us on the Group.
I have an electrical question: how do you make 120 V to a 220 V motor? (Just for education!)
The 5200 lathe lamps is for 220 V, so it is difficult to read, but easy to fix.
To day with my broken motor, I see the FAULT lamp is glowing a littlebit.
Can you explain FAULT error ?
/Johannes
Sendt fr? E-post<> for Windows
Fr?:Chris Wood<mailto:chrisw@...>
Sendt: tysdag 22. mars 2022 17:14
Til: [email protected]<mailto:[email protected]>
Emne: Re: [7x12MiniLathe] LMS 5200 Lathe motor
The motors used on the LittleMachineShop.com mini lathes and mini mills are 230V motors.
The motor on Alibaba is a 48V motor. Besides the voltage being correct, be sure to check the physical dimensions.
SIEG makes those motors at their factory in Shanghai so they may not be standard.
Chris Wood
LittleMachineShop.com<>
The premier source of tooling, parts, and accessories for bench top machinists.
396 W. Washington Blvd. #500, Pasadena, CA 91103
(800)981-9663 * Fax (626)797-7934
From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Michael Jablonski via groups.io
Sent: Tuesday, March 22, 2022 4:01 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
I was looking into getting one of these motors for another project a while ago and found this:
<
I¡¯m not sure if it will work, and I did not buy one yet but thought I¡¯d pass this on to you as a possibility.
I wasn¡¯t happy with the replacement cost from either Micro-Mark or LMS.
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Johannes
Sent: Tuesday, March 22, 2022 3:23 PM
To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>
Subject: [7x12MiniLathe] LMS 5200 Lathe motor
Hi group
I have a 5200 LMS lathe, and I think the motor is gone.
It need a manual twist to run and the motor make a lot of noise.
Sometimes ago the motor make a lot of noise, and I took out the rotor.
The axel under the bearing was very worn, I did something and it has worked ok until today.
A new LMS 4145 500 Watt Brushless DC motor will cost me 350/400 USD.
So before I order, I ask my group :
is it possible to get a new motor that can replace and fit to my 5200 lathe ?
350/400 USD Is nearly 1/3 of a new lathe :-)
If someone have some experience with this motor or similar , you are welcome to give me some advice.
Best regards
Johannes
Mexico
|
Not quite 3 phase as you know it.
It's a BLDC drive based on the Microchip/Atmel BLDC Sensor-based reference design:
There also are designs that do not use an sensor/encoder and instead uses the back-EMF for BLDC control
More here:
An NXP document on BLDC drive using a quadrature encoder:
ON the LMS BLDC - the encoder is that black thing on the back of the motor that has wires going to it. It's very critical that it is aligned correctly. Usually requires some o'scopes to set up the encoder feedback with the actual drive circuitry.
Some companies like CUI make things to make it easier to align the encoders to the drive's back EMF
- see this vid, it will give a good overview of how much of a pain in the ass it can be to align the encoder, and how their AMT One Touch works:
So yea - technically it's three phase, but it's usually something like a trapezoidal waveform that is locked to either an encoder or reads the back EMF to control voltage and current waveforms through the motor coil
toggle quoted message
Show quoted text
On 3/23/2022 12:37 PM, Chris Wood wrote: The control board not only changes 120V to 230V, but it makes it 3-phase too. The marvel of electronics, which I do not understand.
The Fault light indicates an error condition. In your case it may be because the motor is not giving reliable feedback of its speed.
Chris
From: [email protected] <[email protected]> On Behalf Of Johannes via groups.io
Sent: Tuesday, March 22, 2022 4:49 PM
To: [email protected]
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
Hi Chris
Nice you are following us on the Group.
I have an electrical question: how do you make 120 V to a 220 V motor? (Just for education!)
The 5200 lathe lamps is for 220 V, so it is difficult to read, but easy to fix.
To day with my broken motor, I see the FAULT lamp is glowing a littlebit.
Can you explain FAULT error ?
/Johannes
Sendt fr? E-post<> for Windows
Fr?:Chris Wood<mailto:chrisw@...>
Sendt: tysdag 22. mars 2022 17:14
Til: [email protected]<mailto:[email protected]>
Emne: Re: [7x12MiniLathe] LMS 5200 Lathe motor
The motors used on the LittleMachineShop.com mini lathes and mini mills are 230V motors.
The motor on Alibaba is a 48V motor. Besides the voltage being correct, be sure to check the physical dimensions.
SIEG makes those motors at their factory in Shanghai so they may not be standard.
Chris Wood
LittleMachineShop.com<>
The premier source of tooling, parts, and accessories for bench top machinists.
396 W. Washington Blvd. #500, Pasadena, CA 91103
(800)981-9663 * Fax (626)797-7934
From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Michael Jablonski via groups.io
Sent: Tuesday, March 22, 2022 4:01 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
I was looking into getting one of these motors for another project a while ago and found this:
< >
I¡¯m not sure if it will work, and I did not buy one yet but thought I¡¯d pass this on to you as a possibility.
I wasn¡¯t happy with the replacement cost from either Micro-Mark or LMS.
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of Johannes
Sent: Tuesday, March 22, 2022 3:23 PM
To: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>
Subject: [7x12MiniLathe] LMS 5200 Lathe motor
Hi group
I have a 5200 LMS lathe, and I think the motor is gone.
It need a manual twist to run and the motor make a lot of noise.
Sometimes ago the motor make a lot of noise, and I took out the rotor.
The axel under the bearing was very worn, I did something and it has worked ok until today.
A new LMS 4145 500 Watt Brushless DC motor will cost me 350/400 USD.
So before I order, I ask my group :
is it possible to get a new motor that can replace and fit to my 5200 lathe ?
350/400 USD Is nearly 1/3 of a new lathe :-)
If someone have some experience with this motor or similar , you are welcome to give me some advice.
Best regards
Johannes
Mexico
|
Re: Mini Lathe - Mini Mill
Went to that mini-mill forum and I'm a member. So I sent a test notification to my browser and didn't get it. I guess I need to play with it a bit until I get the notifications.
My mill has the Fignoggle adjustable nuts on the lead screws so it actually has very little backlash. I also have DRO's on all the axis. I just wondered if it would be worth the effort to change out the lead screws. Thanks for the heads up on that forum.
Floyd
I? own a Micro-Mark benchtop mill and it came with Imperial lead screws and nuts.? Of course it had backlash -- all feed screws of this type do -- but it's been very usable.? The X axis is better than the Y axis because it has thrust bearings while the Y axis is a steel-on-steel, friction-prone affair.? You're forced to balance the effort to turn the handwheel vs. how much backlash you have.?
The mini-mill forum can be found here: /g/Mini-Mills/topics.?
-Mark
|
The control board not only changes 120V to 230V, but it makes it 3-phase too. The marvel of electronics, which I do not understand.
?
The Fault light indicates an error condition. In your case it may be because the motor is not giving reliable feedback of its speed.
?
Chris
?
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Show quoted text
From: [email protected] < [email protected]>
On Behalf Of Johannes via groups.io
Sent: Tuesday, March 22, 2022 4:49 PM
To: [email protected]
Subject: Re: [7x12MiniLathe] LMS 5200 Lathe motor
?
Hi Chris
Nice you are following us on the Group.
I have an electrical question: how do you make ?120 V to a 220 V motor?? (Just for education!)
?
The 5200 lathe lamps is for 220 V, so it is difficult to read, but easy to fix.
To day with my broken motor, I see the FAULT lamp is glowing a littlebit.
Can you explain FAULT error ?
?
/Johannes
?
?
?
?
Sendt fr? for Windows
?
?
The motors used on the LittleMachineShop.com mini lathes and mini mills are 230V motors.
?
The motor on Alibaba is a 48V motor. Besides the voltage being correct, be sure to check the physical dimensions.
?
SIEG makes those motors at their factory in Shanghai so they may not be standard.
?
Chris Wood
The premier source of tooling, parts, and accessories for bench top machinists.
396 W. Washington Blvd. #500, Pasadena, CA 91103
(800)981-9663 * Fax (626)797-7934
?
?
?
?
?
I was looking into getting one of these motors for another project a while ago and found this:
< >
?
I¡¯m not sure if it will work, and I did not buy one yet but thought I¡¯d pass this on to you as a possibility.
?
I wasn¡¯t happy with the replacement cost from either Micro-Mark or LMS.
?
Michael - California, USA
Micro-Mark MicroLux 7x16
LMS 3990 Hi-Torque Mill with power feed
?
?
?
?
Hi group
?
I have a 5200 LMS lathe, and I think the motor is gone.
It need a manual twist ?to run and the motor make a lot of noise.
?
Sometimes ago the motor make a lot of noise, and I took out the rotor.
The axel under the bearing was very worn, I did something and it has worked ok until today.
?
A new LMS 4145? 500 Watt Brushless DC motor will cost me 350/400 USD.
So before I order, I ask my group :
is it possible to get a new motor that can replace and fit to my 5200 lathe ?
?
350/400 USD Is nearly 1/3 of a new lathe? :-)
?
If someone have some experience with this motor or similar , you are welcome to give me some advice.
?
Best regards
Johannes
Mexico
?
?
?
|
Re: Mini Lathe - Mini Mill
I? own a Micro-Mark benchtop mill and it came with Imperial lead screws and nuts.? Of course it had backlash -- all feed screws of this type do -- but it's been very usable.? The X axis is better than the Y axis because it has thrust bearings while the Y axis is a steel-on-steel, friction-prone affair.? You're forced to balance the effort to turn the handwheel vs. how much backlash you have.? The mini-mill forum can be found here: /g/Mini-Mills/topics.?-Mark
|
John Mattis
