Re: 100mm spindle source in US?
Im going with AC ball bearings.
This is on a custom made CNC mini lathe. My buddy steve built it a few years ago, and I ended up with it. Just stepping it up a little.
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--- In 7x12minilathe@..., "andyf1108" wrote:
Glad to be able to help. Mike of this Group put one on his Clarke (rebadged Sieg) 7x lathe, and fitted taper roller bearings to the spindle at the same time - something you might like to consider. See
< >
Andy
|
10" bed, lead-screw, tool post.
Will swap for parts, tooling, back-lash mods to the hand controls, pieces of lead or good metal to work, leather tools or supplies, old, cool stuff, what-ever.
I also do ceramic coating of parts to offer for swapping.
|
??? The Dr.'s disabled me from work where I've been working in the Coal Mines since 1975. I had to figure out how to fix my shop to ergonomically fit me. I made a blueprint of what was going where. I looked at the Spec.'s on each piece of equipment to figure out how & where to make my benches.
??? It sure has saved me a lot of pain and moving around. I had a right wrist fusion in
94 which was the second surgery i had on it. I been working around physical? impairments since 1978.
??? It is second hand to me to think about these barriers since. It makes a big difference if your going to be at a certain place for any length of time.
Paul? ??
From: John Lindo
To: "7x12minilathe@..." <7x12minilathe@...>
Sent: Wednesday, February
6, 2013 12:54 AM
Subject: Re: [7x12minilathe] lathe height
?
Elbow height is good.. Try and avoid using stools or chairs. It's not easy to see over the top of the machine and is easier to have the chips hit your face.even worse, something flies out of the
chuck,which can happen.And on that point,it's not easy to tighten a chuck or collet sitting down. Also if you have a confined workshop,the stool is always in the way. Exceptions of course if you are unfortunate to be disabled.
John L Spain
From: Jerry Durand
To: 7x12minilathe@...
Sent: Wednesday, February 6, 2013 2:52 AM
Subject: Re: [7x12minilathe] lathe height
?
Lathe should be about elbow height...more or less to personal taste.
On 02/05/2013 05:47 PM, Ebner Heating
Air Conditioning Co. wrote:
I'm getting a
heavy bench set up to accept my lathe. After bolting a heavy
set of casters that were sized to accept the 400 pound
weight I ended up with a bench that is to high to
comfortably work while sitting on a stool. My question would
be is there a rule of thumb 'height wise" that?I should
shoot for? I don't want to cut the legs off so that the
bench ends up to low.
?
Thanks Mike
--
Jerry Durand, Durand Interstellar, Inc.
tel: +1 408 356-3886, USA toll free: 1 866 356-3886
Skype: jerrydurand
|
Sit on your chair or stool, measure down to the floor what ever is comfortable to you to operate your lathe. Since we are all different heights,there is no set bench height.My bench is 36" high. The stool is 18" high. mike
From: Ebner Heating Air Conditioning Co.
To: 7x12minilathe@...
Sent: Tuesday, February 5, 2013 8:47 PM
Subject: [7x12minilathe] lathe height
?
I'm getting a heavy bench set
up to accept my lathe. After bolting a heavy set of casters that were sized to
accept the 400 pound weight I ended up with a bench that is to high to
comfortably work while sitting on a stool. My question would be is there a rule
of thumb 'height wise" that?I should shoot for? I don't want to cut the
legs off so that the bench ends up to low.
?
Thanks
Mike
|
I used my neighbor's floor standing wood lathe one day and it was at the perfect height for me. When I set up my 8x wood lathe I measured his from spindle to floor and it was 44" so I set mine to the same height. Out of curiousity I measured my 7x metal lathe and it too was 44". I'm 6' tall if that helps. On Tue, 5 Feb 2013, Ebner Heating Air Conditioning Co. wrote: I'm getting a heavy bench set up to accept my lathe. After bolting a
heavy set of casters that were sized to accept the 400 pound weight I
ended up with a bench that is to high to comfortably work while sitting
on a stool. My question would be is there a rule of thumb 'height wise"
that I should shoot for? I don't want to cut the legs off so that the
bench ends up to low.
Thanks Mike
Vince. -- Michigan VHF Corp. The Foggy Mist Emporium
|
Re: Real Bull 7x14 lathe questions?
I have the LMS 4100. THE BLDC and Atmel-based control are great. Yes, I've stallled it both on my mill (LMS Hi torque with extended solid column) and lathe. On the mill it went into protection. On the lathe I caught it early enough before the microcontroller caught it and flagged the protection fault.
The Atmel uC uses a set of IGBT's for the motor drivers:
As to torque - snapped a 1/4" endmill on the mill - a faulty rotary table setup let go due to my stupid. Lots of power. Nice dent in the wall where it hit.
The difference is that the Atmel microcontroller will make up torque when it detects the encoder slowing down. At low speed it chugs a bit; not enough to affect what I do.
The motor gets about 147d F after running a while.
FLIR images of my mill
FLIR PDF report
Don Leitch wrote:
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Show quoted text
Gerry the brushless motor in my sc3 is hugely different than in my gaui x5 heli, I can't believe the power that little beast has its nasty , and some one wants more power, with 12 cell battery yikes.
sorry about subject change, I shut up now.
Don
On 7/02/2013, at 12:27 AM, gerry waclawiak <gerrywac@...> wrote:
Andy,
I agree with what you say about speeds, my RB is several years old and the two ranges run to 1250 and 2500rpm approx.
The torque at low speed does depend to a considerable extent to how well the control board is set up but it is not as good as the new single speed hi-tech motor versions. One word of warning though, the cooling of the motor fan falls as a square of the speed so at low speed is negligible so it is relatively easy to fry he motor without realising.
As you say the motors and controllers in the top line single speed models are the same as used in the best electric flying models. They exhibit excellent torque even at low speed (which is how they can dispense with the 2 speed ranges in our lathes and mills), I have them in my model helicopters
Gerry W
Leeds UK
To: 7x12minilathe@...
From: andyf.1108@...
Date: Wed, 6 Feb 2013 11:17:10 +0000
Subject: [7x12minilathe] Re: Real Bull 7x14 lathe questions?
I'm sure you're right, and that it should read 50 to 1250 in Low, 100 to 2500 in High. Whether there's enough torque at the lower end of either range to be useful is perhaps questionable.
I understand that the brushless motor on the new super-duper gearless Sieg is better in that respect. It seems to be a grown-up version of the powerful little electric motors used in model aircraft nowadays.
Andy
--- In 7x12minilathe@..., "Tony Smith" wrote:
Tony, the "new" verion in your second link still has a gearbox, if the
statement as
to spindle speed in the table below the picture is anything to go by. It
says:
"Spindle speed 50-2500/100-2500RPM", which seems to indicate two speed
ranges.
Seems to be just a bit of Chinglish.
It's not much of gearbox if it only changes between 50 & 100 RPM for the low
range.
Actually the description on the old version is the same, so it's wrong too.
Low should be 50-1100 or some like that.
Tony
|
Re: Real Bull 7x14 lathe questions?
Actually I think I¡¯m wrong, it seems the ¡®new¡¯ versions just have fancier controls, but are the same PWM DC drives, not the brushless 3-phase drive the Sieg has. ? They¡¯re 550W vs 250W so they¡¯ll have more power than most of these lathes, but still. ? No-one seems keen to show a photo of the back of the lathe ¨C the hi-lo lever would be a giveaway. ? I¡¯m sure I¡¯ve seen RB ¡®super¡¯ variants, maybe I saw ¡®500W motor¡¯ and assumed it was the same as the Siegs. ? Tony ? ? ? ? I agree with Tony on this
Reading the two spec sheets the only difference appears to be the digital readout and relocation of the speed and direction knobs down onto the face of the cover. The mechanical specs and general appearance seem identical indicating the two speed gearbox. Motor power is a decent enough 550W
If there is a RB with the new hi-tech motor and control to match the top of line Sieg (US LMS versions) it hasn't reached the UK as far as I am aware.
Gerry W
Leeds UK
To: 7x12minilathe@...
From: ajsmith1968@...
Date: Wed, 6 Feb 2013 19:59:53 +1100
Subject: RE: [7x12minilathe] Re: Real Bull 7x14 lathe questions?
? > I'd be slightly wary, Bob. Hitherto, Real Bull mini-lathes have all had
two speed
> ranges with the usual hi/lo gears.
>
> Of course, it may be that they have decided to produce a version with a
> brushless motor and no gearbox, to compete with the one Sieg have produced
> and which LMS sells as the Hi-Torque.
>
> If there is a picture on Ebay,look for a nut on the RH end of the
leadscrew and a
> rectangular saddle. Siegs don't have the nut, and their saddles are
H-shaped.
Real Bull have had the 'Super' version of their lathe for a while.
Old: (I've got
one of these, same colour too).
New:
The chip guard around the toolpost is new. That'll get annoying fast.
Same deal for the mill-mills they make.
Tony
|
Re: Real Bull 7x14 lathe questions?
Gerry the brushless motor in my sc3 is hugely different than in my gaui x5 heli, I can't believe the power that little beast has its nasty , and some one wants more power, with 12 cell battery yikes. sorry about subject change, I shut up now.
toggle quoted message
Show quoted text
On 7/02/2013, at 12:27 AM, gerry waclawiak < gerrywac@...> wrote:
?
Andy,
I agree with what you say about speeds, my RB is several years old and the two ranges run to 1250 and 2500rpm approx.
The torque at low speed does depend to a considerable extent to how well the control board is set up but it is not as good as the new single speed hi-tech motor versions. One word of warning though, the cooling of the motor fan falls as a square of the speed so at low speed is negligible so it is relatively easy to fry he motor without realising.
As you say the motors and controllers in the top line single speed models are the same as used in the best electric flying models. They exhibit excellent torque even at low speed (which is how they can dispense with the 2 speed ranges in our lathes and mills), I have them in my model helicopters
Gerry W
Leeds UK
To: 7x12minilathe@...From: andyf.1108@...Date: Wed, 6 Feb 2013 11:17:10 +0000 Subject: [7x12minilathe] Re: Real Bull 7x14 lathe questions?
?
I'm sure you're right, and that it should read 50 to 1250 in Low, 100 to 2500 in High. Whether there's enough torque at the lower end of either range to be useful is perhaps questionable.
I understand that the brushless motor on the new super-duper gearless Sieg is better in that respect. It seems to be a grown-up version of the powerful little electric motors used in model aircraft nowadays.
Andy
--- In 7x12minilathe@..., "Tony Smith" wrote:
>
> > Tony, the "new" verion in your second link still has a gearbox, if the
> statement as
> > to spindle speed in the table below the picture is anything to go by. It
> says:
> > "Spindle speed 50-2500/100-2500RPM", which seems to indicate two speed
> > ranges.
>
>
> Seems to be just a bit of Chinglish.
>
> It's not much of gearbox if it only changes between 50 & 100 RPM for the low
> range.
>
> Actually the description on the old version is the same, so it's wrong too.
> Low should be 50-1100 or some like that.
>
> Tony
>
|
Re: Real Bull 7x14 lathe questions?
I agree with Tony on this
Reading the two spec sheets the only difference appears to be the digital readout and relocation of the speed and direction knobs down onto the face of the cover. The mechanical specs and general appearance seem identical indicating the two speed gearbox. Motor power is a decent enough 550W
If there is a RB with the new hi-tech motor and control to match the top of line Sieg (US LMS versions) it hasn't reached the UK as far as I am aware.
Gerry W
Leeds UK
To: 7x12minilathe@... From: ajsmith1968@... Date: Wed, 6 Feb 2013 19:59:53 +1100 Subject: RE: [7x12minilathe] Re: Real Bull 7x14 lathe questions?
?
> I'd be slightly wary, Bob. Hitherto, Real Bull mini-lathes have all had
two speed
> ranges with the usual hi/lo gears.
>
> Of course, it may be that they have decided to produce a version with a
> brushless motor and no gearbox, to compete with the one Sieg have produced
> and which LMS sells as the Hi-Torque.
>
> If there is a picture on Ebay,look for a nut on the RH end of the
leadscrew and a
> rectangular saddle. Siegs don't have the nut, and their saddles are
H-shaped.
Real Bull have had the 'Super' version of their lathe for a while.
Old: (I've got
one of these, same colour too).
New:
The chip guard around the toolpost is new. That'll get annoying fast.
Same deal for the mill-mills they make.
Tony
|
Re: Real Bull 7x14 lathe questions?
I'm sure you're right, and that it should read 50 to 1250 in Low, 100 to 2500 in High. Whether there's enough torque at the lower end of either range to be
useful is perhaps questionable.
I understand that the brushless motor on the new super-duper gearless Sieg is better in that respect. It seems to be a grown-up version of the powerful little electric motors used in model aircraft nowadays. I can stall my lathe at low speed easily enough. I haven't seen the new super duper version to be able to make a comparison. Sieg & RB probably use the same motors anyway, I doubt there's much real difference between them performance-wise. Tony
|
Re: Real Bull 7x14 lathe questions?
Andy,
I agree with what you say about speeds, my RB is several years old and the two ranges run to 1250 and 2500rpm approx.
The torque at low speed does depend to a considerable extent to how well the control board is set up but it is not as good as the new single speed hi-tech motor versions. One word of warning though, the cooling of the motor fan falls as a square of the speed so at low speed is negligible so it is relatively easy to fry he motor without realising.
As you say the motors and controllers in the top line single speed models are the same as used in the best electric flying models. They exhibit excellent torque even at low speed (which is how they can dispense with the 2 speed ranges in our lathes and mills), I have them in my model helicopters
Gerry W
Leeds UK
To: 7x12minilathe@... From: andyf.1108@... Date: Wed, 6 Feb 2013 11:17:10 +0000 Subject: [7x12minilathe] Re: Real Bull 7x14 lathe questions?
?
I'm sure you're right, and that it should read 50 to 1250 in Low, 100 to 2500 in High. Whether there's enough torque at the lower end of either range to be useful is perhaps questionable.
I understand that the brushless motor on the new super-duper gearless Sieg is better in that respect. It seems to be a grown-up version of the powerful little electric motors used in model aircraft nowadays.
Andy
--- In 7x12minilathe@..., "Tony Smith" wrote:
>
> > Tony, the "new" verion in your second link still has a gearbox, if the
> statement as
> > to spindle speed in the table below the picture is anything to go by. It
> says:
> > "Spindle speed 50-2500/100-2500RPM", which seems to indicate two speed
> > ranges.
>
>
> Seems to be just a bit of Chinglish.
>
> It's not much of gearbox if it only changes between 50 & 100 RPM for the low
> range.
>
> Actually the description on the old version is the same, so it's wrong too.
> Low should be 50-1100 or some like that.
>
> Tony
>
|
Re: Real Bull 7x14 lathe questions?
I'm sure you're right, and that it should read 50 to 1250 in Low, 100 to 2500 in High. Whether there's enough torque at the lower end of either range to be useful is perhaps questionable.
I understand that the brushless motor on the new super-duper gearless Sieg is better in that respect. It seems to be a grown-up version of the powerful little electric motors used in model aircraft nowadays.
Andy
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., "Tony Smith" wrote:
Tony, the "new" verion in your second link still has a gearbox, if the statement as
to spindle speed in the table below the picture is anything to go by. It says:
"Spindle speed 50-2500/100-2500RPM", which seems to indicate two speed
ranges.
Seems to be just a bit of Chinglish.
It's not much of gearbox if it only changes between 50 & 100 RPM for the low
range.
Actually the description on the old version is the same, so it's wrong too.
Low should be 50-1100 or some like that.
Tony
|
Re: Which lube do you use
Roy wrote......The problem is cast iron swarf is a
powder; there's enough carbon in it that cutting oil would just make a
mess........
?
True, in black/grey cast iron there is enough free
carbon powder to act as a dry lubricant. In prodution machine work, often a
blast of compressed air is used as a 'coolant'.
Cheers.
???????
Ellis
|
Re: Real Bull 7x14 lathe questions?
Tony, the "new" verion in your second link still has a gearbox, if the statement as to spindle speed in the table below the picture is anything to go by. It says: "Spindle speed 50-2500/100-2500RPM", which seems to indicate two speed
ranges. Seems to be just a bit of Chinglish. It's not much of gearbox if it only changes between 50 & 100 RPM for the low range. Actually the description on the old version is the same, so it's wrong too. Low should be 50-1100 or some like that. Tony
|
?
The general rule for lathes and mills is the handwheels (carriage
handwheel on the lathe) should be about elbow height. This is just
a rule of thumb.
?I got a deal on two bar stools, nice black leather padded seats with back rests, where the top of the seat is
~30" tall. For my 5'10" height, this means I do not really lower
my upper body height very much when I sit down on the stools. They
have the usual bar around the four legs for resting your feet on,
and under my lathe there is a box I can use as a foot rest when I
am leaning over the machine to carefully disengage the carriage
feed lever when turning up to a shoulder and such like that.
?If I had to choose, I would prefer a machine to be a little too
low versus too high, since with a machine at or a little below the
elbow height rule, I can see and reach everything easily. Unless
you can stand on your feet for hours without discomfort
(especially after working all day), I would personally recommend
doing whatever it takes with whatever you have to ensure your
maximum comfort over extended periods of time. Small machines take
light cuts and the time can really add up before you know it. In
my case, I will often prefer to stand for a time, but usually end
up sitting after perhaps an hour or so because I need to get off
my damn feet. YMMV. In any case, you are going to spend a large
amount of time working at those little machines,
so simply being comfortable can make all the difference to your
enjoyment, and add quite a bit to your available patience too...
?In my case, working things out so as to be
able to comfortably stand OR sit at each machine for however long
it takes to get something done, became
every bit as serious a consideration as what
kind of machines I bought and what tooling I
use and so forth. Younger and/or healthier folks may vary
widely on their opinions on the
details, but for me, I need to be able
to sit and work as patiently
as something may?require. If I had to stand all the damn time I'd have to
do something else, or do all work in short bursts, or just go fishing instead.
And of course, YMMV, and widely.
?Just my two cents...!
?John Z., York, Pa. USA
On 2/5/2013 8:47 PM, Ebner Heating Air
Conditioning Co. wrote:
toggle quoted message
Show quoted text
?
I'm
getting a heavy bench set up to accept my lathe. After
bolting a heavy set of casters that were sized to
accept the 400 pound weight I ended up with a bench
that is to high to comfortably work while sitting on a
stool. My question would be is there a rule of thumb
'height wise" that?I should shoot for? I don't want to
cut the legs off so that the bench ends up to low.
?
Thanks
Mike
|
In article <1360120342.56572.YahooMailClassic@...>, Mark Schwiebert <maschwiebert@...> wrote: I have old eyes,and use the mini, for tiny work,so I have mine high
enough,that I can focus my bi-focals,and #5 opti-visors. But if you are
going to make heavy cuts,you do not want hot chips in your face. The answer to that is to replace your safety glasses or goggles - you DO wear them don't you! - with a full face visor. I have always worn one of these as I find it more comfortable. -- Stuart
|
My own preference is to have the cross slide handle at elbow height.
Andy
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., "Ebner Heating Air Conditioning Co." wrote:
I'm getting a heavy bench set up to accept my lathe. After bolting a
heavy set of casters that were sized to accept the 400 pound weight I
ended up with a bench that is to high to comfortably work while sitting
on a stool. My question would be is there a rule of thumb 'height wise"
that I should shoot for? I don't want to cut the legs off so that the
bench ends up to low.
Thanks Mike
|
Re: Real Bull 7x14 lathe questions?
Tony, the "new" verion in your second link still has a gearbox, if the statement as to spindle speed in the table below the picture is anything to go by. It says: "Spindle speed 50-2500/100-2500RPM", which seems to indicate two speed ranges.
Andy
toggle quoted message
Show quoted text
--- In 7x12minilathe@..., "Tony Smith" wrote:
I'd be slightly wary, Bob. Hitherto, Real Bull mini-lathes have all had two speed
ranges with the usual hi/lo gears.
Of course, it may be that they have decided to produce a version with a
brushless motor and no gearbox, to compete with the one Sieg have produced
and which LMS sells as the Hi-Torque.
If there is a picture on Ebay,look for a nut on the RH end of the leadscrew and a
rectangular saddle. Siegs don't have the nut, and their saddles are H-shaped.
Real Bull have had the 'Super' version of their lathe for a while.
Old: . (I've got
one of these, same colour too).
New:
The chip guard around the toolpost is new. That'll get annoying fast.
Same deal for the mill-mills they make.
Tony
|
Re: Real Bull 7x14 lathe questions?
I'd be slightly wary, Bob. Hitherto, Real Bull mini-lathes have all had two speed ranges with the usual hi/lo gears.
Of course, it may be that they have decided to produce a version with a
brushless motor and no gearbox, to compete with the one Sieg have produced
and which LMS sells as the Hi-Torque.
If there is a picture on Ebay,look for a nut on the RH end of the leadscrew and a rectangular saddle. Siegs don't have the nut, and their saddles are H-shaped. Real Bull have had the 'Super' version of their lathe for a while. Old: . (I've got one of these, same colour too). New: The chip guard around the toolpost is new. That'll get annoying fast. Same deal for the mill-mills they make. Tony
|
Re: Real Bull 7x14 lathe questions?
Hello Andy. As far as I am aware Real Bull ?as of 2 months ago did not produce a version with a brushless motor. Hugh at Amadeal will have the up to date info on this.
John L?| Spain
From: andyf1108
To: 7x12minilathe@...
Sent: Wednesday, February 6, 2013 9:49 AM
Subject: [7x12minilathe] Re: Real Bull 7x14 lathe questions?
?
I'd be slightly wary, Bob. Hitherto, Real Bull mini-lathes have all had two speed ranges with the usual hi/lo gears.
Of course, it may be that they have decided to produce a version with a brushless motor and no gearbox, to compete with the one Sieg have produced and which LMS sells as the Hi-Torque.
If there is a picture on Ebay,look for a nut on the RH end of the leadscrew and a rectangular saddle. Siegs don't have the nut, and their saddles are H-shaped.
Andy
--- In 7x12minilathe@..., "bob_guenthner" wrote:
>
> Anyone know anything about these? Found one listed for $650 on eBay. The description says variable speed and the seller says it has no high/low gear box. Just looking to see if there's anyone that knows anything about them.
>
> Bob
>
|
gerry waclawiak