7x12MiniLathe@groups.io

Re: Installed a Digital Readout on Lathe

Yes.  Zietlowdesign.com should do the trick.

Lee



--- In 7x12minilathe@..., "bbftx" <bflint@a...> wrote:
Lee
Do you have a web address for Zietlow?
I couldn't find it with a Google search.
Thanks
B Flint

--- In 7x12minilathe@..., "trainman80005" 
<Trainman4@h...> wrote:
Hi:

I have just completed the installation of a digital readout on my 
Grizzly 7 X 12 and could not be happier.  I purchased the DRO from 
Zietlow Design off of the internet and got the Quill Kits for the 
machine off of Ebay.  On the Zietlow website there are complete 
instructions on how to make the mounts required for the installation 
and how to set everything up.  It is really nice to now be able to 
know exactly where your cutter is located on the x and y axis and not 
have to make a guess by reading the dials and worring about 
backlash.  The entire project was completed for less than $250.00.  
I 
am placing some pictures in the photo section of the installation.

Lee Brown

Re: 7x12 Blows Fuses ?

Chris Wood

#336

John:

It sounds like the MOSFETs have blown. We have replacements that are higher
capacity. 


Regards,
Chris Wood
LittleMachineShop.com <www.littlemachineshop.com> 
The premier source of parts and accessories for mini lathes and mini mills. 
221 E. Walnut St. #110, Pasadena, CA 91101 
(800)981-9663 * Fax (626)584-5844

Show quoted text

-----Original Message-----
From: John [mailto:moran03@...]
Sent: Sunday, March 23, 2003 8:32 AM
To: 7x12minilathe@...
Subject: [7x12minilathe] 7x12 Blows Fuses ?

My 7x12 which is now 2.5 months old popped its fuse shortly after 
startup Friday, just as I was beginning a parting cut at low speed.  
I installed the replacement fuse and , with the speed control in the 
OFF position and the tool backed away, the lathe started as if it was 
at full speed and the fuse popped again in less than a second.

This is a relatively new unit so I called Homier and they promised to 
call me back on Monday.  I'm just wondering if this is a common 
problem; my understanding is the Homiers use an SCR based controller 
which is less prone to failure than the MOSFET types. My ckt board 
has a sticker with FC250J/110V and the large power devices are 
identified as K790 -- the board uses surface mount devices except 
for  power handling which are thru-hole.  Anybody have more info on 
the Homier controller?

Up until this happened I was very happy with the controller since it 
allowed speed to be reduced to 12rpm, slower than most references in 
the 7x10 group specify.  I did notice that when the speed control was 
in the OFF position that rotating the knob slightly(as alowed while 
OFF) made the chuck would move slightly and groan a bit.  Since it 
seems to be live even while OFF I always turn the wall outlet off 
after use.

John

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Re: Installed a Digital Readout on Lathe

John

#333

Check this address, it may be what you want:
 





--- In 7x12minilathe@..., "bbftx" <bflint@a...> wrote:
Lee
Do you have a web address for Zietlow?
I couldn't find it with a Google search.
Thanks
B Flint

--- In 7x12minilathe@..., "trainman80005" 
<Trainman4@h...> wrote:
Hi:

I have just completed the installation of a digital readout on my 
Grizzly 7 X 12 and could not be happier.  I purchased the DRO from 
Zietlow Design off of the internet and got the Quill Kits for the 
machine off of Ebay.  On the Zietlow website there are complete 
instructions on how to make the mounts required for the installation 
and how to set everything up.  It is really nice to now be able to 
know exactly where your cutter is located on the x and y axis and not 
have to make a guess by reading the dials and worring about 
backlash.  The entire project was completed for less than $250.00.  
I 
am placing some pictures in the photo section of the installation.

Lee Brown

Re: 7x12 Blows Fuses ?

John

#332

Hi Mike,

Thanks for the info on the FET -- I didn't know what it was for sure. 
I understand that there is a more rugged FET which can be used for a 
replacement so I'll talk to Homier about that when they call.

Like you, I found the controller worked nicely (until it failed). 
I've stalled it several times at low speeds (parting mostly) and it 
just hums -- I quickly turn it off with the pot and release the tool.

Since my lathe is inactive anyway I'm taking advantage of the down 
time to fiddle with some of the suggested mods. I've lapped the 
gibs/dovetails on the cross and compound slides and they seem a bit 
smoother now although they were not bad to begin with.  Now I'm 
trying to adjust the backlash out of the cross slide without causing 
binding, which isn't as easy as I expected...

John

--- In 7x12minilathe@..., "Mike Nash" 
<mnfwd2.minilathe@m...> wrote:
It sounds like you have the newer (Sieg made) Homier with a mosfet type
controller. I have the older Homier with the SCR controller and these would
fail to zero speed with blown fuses.

Yep, it's a mosfet controller:
Description:
2SK 790
N-FET/500V/15A/150W

I find these failures strange. My Homier mini mill uses a mosfet drive and
(so far) it has simply "tripped" when overloaded. Turning the speed pot to
zero (click) and back on resets it.

Mike Nash



----- Original Message -----
From: "John" <moran03@e...>
To: <7x12minilathe@...>
Sent: Sunday, March 23, 2003 10:32 AM
Subject: [7x12minilathe] 7x12 Blows Fuses ?


My 7x12 which is now 2.5 months old popped its fuse shortly after
startup Friday, just as I was beginning a parting cut at low speed.
I installed the replacement fuse and , with the speed control in the
OFF position and the tool backed away, the lathe started as if it was
at full speed and the fuse popped again in less than a second.

This is a relatively new unit so I called Homier and they promised to
call me back on Monday.  I'm just wondering if this is a common
problem; my understanding is the Homiers use an SCR based controller
which is less prone to failure than the MOSFET types. My ckt board
has a sticker with FC250J/110V and the large power devices are
identified as K790 -- the board uses surface mount devices except
for  power handling which are thru-hole.  Anybody have more info on
the Homier controller?

Up until this happened I was very happy with the controller since it
allowed speed to be reduced to 12rpm, slower than most references in
the 7x10 group specify.  I did notice that when the speed control was
in the OFF position that rotating the knob slightly(as alowed while
OFF) made the chuck would move slightly and groan a bit.  Since it
seems to be live even while OFF I always turn the wall outlet off
after use.

John



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Re: Installed a Digital Readout on Lathe

bbftx

#331

Lee
Do you have a web address for Zietlow?
I couldn't find it with a Google search.
Thanks
B Flint

--- In 7x12minilathe@..., "trainman80005" 
<Trainman4@h...> wrote:
Hi:

I have just completed the installation of a digital readout on my 
Grizzly 7 X 12 and could not be happier.  I purchased the DRO from 
Zietlow Design off of the internet and got the Quill Kits for the 
machine off of Ebay.  On the Zietlow website there are complete 
instructions on how to make the mounts required for the installation 
and how to set everything up.  It is really nice to now be able to 
know exactly where your cutter is located on the x and y axis and not 
have to make a guess by reading the dials and worring about 
backlash.  The entire project was completed for less than $250.00.  I 
am placing some pictures in the photo section of the installation.

Lee Brown

Re: New Member

bbftx

#330

What other machines do you have Bill?
I have a Burke #4 mill to go with my Homier 7x12.
One of the most impactful changes I made to my lathe to overcome
the "crudities," as you put it so well, was to install a real
toolholder.  I went with the Series 100 Phase II QCTP, after making
the JWE compound mods. This dramatically reduced chatter and 
improved rigidity.  I don't find myself fiddling with those gib
adjustment set screws all the time now. (That never seemed to 
accomplish much!)
Next thing I want to do is make some tapered saddle gibs.
B Flint

--- In 7x12minilathe@..., "bwmsbldr" <BWMSBLDR@J...> 
wrote:
   I moved to this list from a similar one that suffered from an 
excess of Off Topic posts. I am hoping to participate in a list that 
is focused on the small chinese hobby lath. I have been machining 
as a hobby since starting in HS in 1953 and own a selection of machine 
tools. Bought my HF 7x10 at a garage sale for $100 last year. I have 
added a number of accessories from HF lacking only a four jaw chuck. 
the current effort is to eliminate the play and adjustment crudities 
in the machine and repair it up to optimum condition. Fortunatly 
having other machines will ease that project.

                                      Bill Williams (Bill in Boulder)

Re: QCTP Mini-Lathe.com

bbftx

#329

Tom,
I looked at your photos. Nice work.  I think you made the right 
move going with 4 screws to hold the tools.   I like the height 
adjustment arrangement you used too.  
Are those titanium coated carbide inserts in your pictures?  I 
recently got some and have been experimenting with them, but 
haven't found the right combination of speed and depth of cut 
to make them work well.  What are you doing on steel and aluminum?
B Flint



-- In 7x12minilathe@..., "tomdoyle123456789" 
<tdoyle@m...> wrote:
I recently completed the Cam Action QCTP project described on 
mini-lathe.com. It works very well and I am very happy with it. 
I made a few changes you might want to consider if you decide to
build it. I added a parting tool holder and changed the way the 
height adjusting screw is tensioned. The height adjusting screw 
tensioning described on mini-lathe.com would not work with the 
parting tool so I used a more traditional method on all the tool 
holders including the parting tool. Used a 3/4" 10-34 set screw 
threaded 1/4" into the tool holder. 
A knurled 3/16" thick adjusting screw is made from 1/2" brass rod. 
A split washer and 10/32 nut hold the adjusting screw in place. 

I used 4 screws to hold the tools in place rather than two. 
Made the cam shaft from 1/2" drill rod which allowed the use of 
1/4" rod for the handle. I posted some fairly nice photos in the 
photos section. The close up photo of the parting tool (look at 
it in full size) should tell the story If anyone needs more info 
on the parting tool holder let me know.

             tom ...

Re: need help or advice in NJ/NY

#337

--- In 7x12minilathe@..., Boris Tolkachev 
<btolkachev@y...> wrote:

My name is Boris, I live in Jersey City, NJ. 

]Have you tried vo tech schools or community colleges in your area. 
Maybe even some high schools offer night courses and will allow use 
of their machines.

Re: 7x12 Blows Fuses ?

Mike Nash

#328

It sounds like you have the newer (Sieg made) Homier with a mosfet type
controller. I have the older Homier with the SCR controller and these would
fail to zero speed with blown fuses.

Yep, it's a mosfet controller:
Description:
2SK 790
N-FET/500V/15A/150W

I find these failures strange. My Homier mini mill uses a mosfet drive and
(so far) it has simply "tripped" when overloaded. Turning the speed pot to
zero (click) and back on resets it.

Mike Nash

Show quoted text

----- Original Message -----
From: "John" <moran03@...>
To: <7x12minilathe@...>
Sent: Sunday, March 23, 2003 10:32 AM
Subject: [7x12minilathe] 7x12 Blows Fuses ?

My 7x12 which is now 2.5 months old popped its fuse shortly after
startup Friday, just as I was beginning a parting cut at low speed.
I installed the replacement fuse and , with the speed control in the
OFF position and the tool backed away, the lathe started as if it was
at full speed and the fuse popped again in less than a second.

This is a relatively new unit so I called Homier and they promised to
call me back on Monday.  I'm just wondering if this is a common
problem; my understanding is the Homiers use an SCR based controller
which is less prone to failure than the MOSFET types. My ckt board
has a sticker with FC250J/110V and the large power devices are
identified as K790 -- the board uses surface mount devices except
for  power handling which are thru-hole.  Anybody have more info on
the Homier controller?

Up until this happened I was very happy with the controller since it
allowed speed to be reduced to 12rpm, slower than most references in
the 7x10 group specify.  I did notice that when the speed control was
in the OFF position that rotating the knob slightly(as alowed while
OFF) made the chuck would move slightly and groan a bit.  Since it
seems to be live even while OFF I always turn the wall outlet off
after use.

John

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7x12minilathe-unsubscribe@...

Your use of Yahoo! Groups is subject to 

7x12 Blows Fuses ?

John

#327

My 7x12 which is now 2.5 months old popped its fuse shortly after 
startup Friday, just as I was beginning a parting cut at low speed.  
I installed the replacement fuse and , with the speed control in the 
OFF position and the tool backed away, the lathe started as if it was 
at full speed and the fuse popped again in less than a second.

This is a relatively new unit so I called Homier and they promised to 
call me back on Monday.  I'm just wondering if this is a common 
problem; my understanding is the Homiers use an SCR based controller 
which is less prone to failure than the MOSFET types. My ckt board 
has a sticker with FC250J/110V and the large power devices are 
identified as K790 -- the board uses surface mount devices except 
for  power handling which are thru-hole.  Anybody have more info on 
the Homier controller?

Up until this happened I was very happy with the controller since it 
allowed speed to be reduced to 12rpm, slower than most references in 
the 7x10 group specify.  I did notice that when the speed control was 
in the OFF position that rotating the knob slightly(as alowed while 
OFF) made the chuck would move slightly and groan a bit.  Since it 
seems to be live even while OFF I always turn the wall outlet off 
after use.

John

A Couple of Small Mod's.

#321

I have made a couple of small modifications to improve my 7 x12. 
Using a small piece of hyfax plastic from the junk box I made a flag 
for the tail stock so that I could mount a dial indicator and measure 
the depth of a hole I am boring. (photo in photo section) The dial 
indicator is a cheapy from Harbor Freight mounted on a magnet using a 
small piece of 3/4" aluminum angle.

I have also added some short legs to boost the height of the lathe.  
My lathe sits on a counter height bench and placed it at the wrong 
height for me so I made short legs from 1 1/2" Aluminum to raise the 
lathe.  Much better.  (photo in photo section)

Lee Brown

Installed a Digital Readout on Lathe

#322

Hi:

I have just completed the installation of a digital readout on my 
Grizzly 7 X 12 and could not be happier.  I purchased the DRO from 
Zietlow Design off of the internet and got the Quill Kits for the 
machine off of Ebay.  On the Zietlow website there are complete 
instructions on how to make the mounts required for the installation 
and how to set everything up.  It is really nice to now be able to 
know exactly where your cutter is located on the x and y axis and not 
have to make a guess by reading the dials and worring about 
backlash.  The entire project was completed for less than $250.00.  I 
am placing some pictures in the photo section of the installation.

Lee Brown

Handwheels For Sale - Cheap

Jim E.

#320

For those not on the 7x10minilathe group:

Show quoted text

Not too long back there were postings about adding a handwheel to the
spindle for threading, and to the leadscrew for slower feeds and finer
adjustments.

I've come upon a source of cast aluminum handwheels for a very low
price.  I can get them to the group members for $10.00 each, including
shipping.  No ups, no extras.

The handwheels are flat with 4 spokes, 7/16" thick, and 6" in diameter.
The hub is 1???" in diameter and protrudes 1/4" from one side of the
handwheel.  There is a  7/16" square hole in the middle of the hub, with
a slight taper to it.

If you're interested, please e-mail me off-forum to exchange mailing
information.  I'll accept cash, check, or money order (I have a PayPal
account also, if you'd prefer that).  I'll collect all the orders
through the end of this month (March), and mail them out the following
week.

Hurry while supplies last!

                   Graciously,
                       Jim
                   Lakewood, CA
              All Hail Rube Goldberg!

New Member

bwmsbldr

#323

I moved to this list from a similar one that suffered from an 
excess of Off Topic posts. I am hoping to participate in a list that 
is focused on the small chinese hobby lath. I have been machining 
as a hobby since starting in HS in 1953 and own a selection of machine 
tools. Bought my HF 7x10 at a garage sale for $100 last year. I have 
added a number of accessories from HF lacking only a four jaw chuck. 
the current effort is to eliminate the play and adjustment crudities 
in the machine and repair it up to optimum condition. Fortunatly 
having other machines will ease that project.

                                      Bill Williams (Bill in Boulder)

QCTP Mini-Lathe.com

tomdoyle123456789

#324

I recently completed the Cam Action QCTP project described on mini-
lathe.com. It works very well and I am very happy with it. I made a 
few changes you might want to consider if you decide to build it. I 
added a parting tool holder and changed the way the height adjusting 
screw is tensioned. The height adjusting screw tensioning described 
on mini-lathe.com would not work with the parting tool so I used a 
more traditional method on all the tool holders including the parting 
tool. Used a 3/4" 10-34 set screw threaded 1/4" into the tool holder. 
A knurled 3/16" thick adjusting screw is made from 1/2" brass rod. A 
split washer and 10/32 nut hold the adjusting screw in place. 

I used 4 screws to hold the tools in place rather than two. 
Made the cam shaft from 1/2" drill rod which allowed the use of 1/4" 
rod for the handle. I posted some fairly nice photos in the photos 
section. The close up photo of the parting tool (look at it in full 
size) should tell the story If anyone needs more info on the parting 
tool holder let me know.

             tom ...

need help or advice in NJ/NY

Boris Tolkachev

#325

My name is Boris, I live in Jersey City, NJ. 

I need to build a prototype of my invention. Unfortunately, due to my recent relocation and long process of job seeking, my funds are not in good condition yet. I can't buy simple lathe I need now, and I'm looking for access to lathe belonging to somebody else. I'm a handyman, from my High school times I remember how to use lathe and I have some money to pay for the access or for parts manufacturing 
if it will be affordable to me. I do not have many friends here in NJ and nobody I know can tell me where I can access rotating lathe.

All parts I want to make now are small (all dimensions less than 4 inches). I evaluate time I need as 6 - 8 hr of work. 

I will be grateful for advise regarding places in NJ/NY where rotating lathes might be accessible.

Thanks

Boris 

---------------------------------
Do you Yahoo!?
Yahoo! Web Hosting - establish your business online

Re: Lathe set up metric

paullathe

#326

Thanks Bob.  If I read you right if I bought an Asian 7x12 or 9x20 
I'd have these same issues, right?

Thanks a bunch.

Paul

--- In 7x12minilathe@..., Bob Sunley <rosunley@s...> 
wrote:
With the exception of the Micromart lathes and the leadscrews on the US 
model 7xX they all have metric cross slide and compound screws, so no big 
problem there.  You have to cut to size anyway so if you have inch 
measuring tools you are ok, or bring your calculator. If the graduations on 
the lathe are 40 per turn or 0.025mm per division, that is just a hair under 
0.001" by 0.0004 mm. per division.

Bob

On 11 Mar 2003, at 11:49, pkklathe wrote:

I am looking at a lathe that is set up to metric scale - the dials 
are all in metric gradations and so are the threads.  How much of a 
problem is using such a machine if turning to Imperial measure?  

I want to make working model steam and internal combustion engines 
from castine kits and bar stock, and assume many of the kits are 
from overseas sources and come with metric drawings anyway...
 
It is a nice machine otherwise and a good value...

Thanks,

Paul

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Request to start sending email

#319

_________________________________________________________________

Re: Lathe set up metric

#318

One other thing, if a lot of inch threading is required, pick up an inch 
leadscrew conversion kit from 
along with a set of inch changegears.  Solves any almost fits threading 
problems.

Bob

--- In 7x12minilathe@..., "pkklathe" <pkk@o...> wrote:
I am looking at a lathe that is set up to metric scale - the dials 
are all in metric gradations and so are the threads.  How much of a 
problem is using such a machine if turning to Imperial measure?  

I want to make working model steam and internal combustion engines 
from castine kits and bar stock, and assume many of the kits are 
from overseas sources and come with metric drawings anyway...
 
It is a nice machine otherwise and a good value...

Thanks,

Paul
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7x12minilathe-unsubscribe@...

 

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Re: Lathe set up metric

#317

The graduations aren't much of a problem, threading in the system 
other than the leadscrew is cut to can be a nuisance.  To cut 
Imperial threads, you may need different change gears than the lathe 
comes with and the thread indicator probably won't work properly.  
They're not insurmountable problems, more a convenience issue.

Roy

Show quoted text

--- In 7x12minilathe@..., "pkklathe" <pkk@o...> wrote:
I am looking at a lathe that is set up to metric scale - the dials 
are all in metric gradations and so are the threads.  How much of a 
problem is using such a machine if turning to Imperial measure?  

I want to make working model steam and internal combustion engines 
from castine kits and bar stock, and assume many of the kits are 
from overseas sources and come with metric drawings anyway...
 
It is a nice machine otherwise and a good value...

Thanks,

Paul

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