Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 15 January 2016 at 01:04, Gregg Eshelman  wrote:
>
> The catch is that those small screws tend to cost more than larger ones.

They are not so bad now:
http://www.zappautomation.co.uk/r08-025b1-rsw.html

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Re: [Emc-users] Stepper Motors/Drives

[John Dammeyer]

Very impressive that you were able to squeeze a ball screw under the cross
slide. What diameter screw is that?
Thanks for posting the pictures.
John Dammeyer

> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-14-16 5:58 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Stepper Motors/Drives
> 
> 
> On 14 January 2016 at 03:32, Gregg Eshelman <g_ala...@yahoo.com> wrote:
> > Got any pics of yours? where are you located?
> 
> https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5611
> 904480713910226
> And also: http://www.cnczone.com/forums/mini-lathe/63621-cnc-
> 2.html#post509784
> 
> I am in the UK.
> 
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
>

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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 14 January 2016 at 03:32, Gregg Eshelman  wrote:
> Got any pics of yours? where are you located?

https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5611904480713910226
And also: http://www.cnczone.com/forums/mini-lathe/63621-cnc-2.html#post509784

I am in the UK.

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Re: [Emc-users] Stepper Motors/Drives

[Gregg Eshelman]

On 1/14/2016 10:54 AM, John Dammeyer wrote:
> Very impressive that you were able to squeeze a ball screw under the cross
> slide. What diameter screw is that?
> Thanks for posting the pictures.

5/16" or 8mm can be just fit in by milling out the nut channel in the 
saddle as wide as possible while still leaving the dovetail sides.

Denford did it to their CNC Compact 8 clone "ORAC", but cut off about 
the rear 3rd of the cross slide.

The catch is that those small screws tend to cost more than larger ones. :P

Some have fit a larger screw to a 9x20 by milling down the top of the 
saddle and making a new cross slide, mounted with a pair of thin linear 
slides.

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Re: [Emc-users] Stepper Motors/Drives

[John Dammeyer]

Very nice.  Especially hearing the spindle speed up as the tool moves inward
to keep the same SFM.
John Dammeyer

> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-14-16 10:57 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Stepper Motors/Drives
> 
> 
> On 14 January 2016 at 17:54, John Dammeyer <jo...@autoartisans.com>
> wrote:
> > Very impressive that you were able to squeeze a ball screw under the
cross
> > slide. What diameter screw is that?
> 
> 8mm.
> 
> I thought it would be too small, but it has worked very well for years.
> 
> This is a good example of the lathe in action (It is a much better
> lathe than it is a mill)
> https://youtu.be/nIYMfyf4jDI
> 
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
>

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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 14 January 2016 at 17:54, John Dammeyer  wrote:
> Very impressive that you were able to squeeze a ball screw under the cross
> slide. What diameter screw is that?

8mm.

I thought it would be too small, but it has worked very well for years.

This is a good example of the lathe in action (It is a much better
lathe than it is a mill)
https://youtu.be/nIYMfyf4jDI

-- 
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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 13 January 2016 at 17:51, John Dammeyer  wrote:
> So back to basics with a flex handle on the 1" socket and 1' away I started
> adding weight.  Each oz  would be 12 oz-in.  As I recall it took very little
> to move it.   Perhaps 50 oz-in.

My stepper lathe is fine for normal turning and boring.
However, one place where CNC can really make life easier on a lathe is
peck-drilling holes with a drill held in the toolpost.
My lathe does not seem to struggle at all with turning cuts within the
torque limit of the spindle, but stall immediately if trying to push a
drill > 10mm.

It is this that has me fitting a 1kW servo to the Z axis of my new
conversion project. (And the fact that there is room, and I had the
motor available)

-- 
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If you can't fix it, you don't own it.
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Re: [Emc-users] Stepper Motors/Drives

[John Dammeyer]

Ah.
That's about 5 tpi.  495 oz-in sounds kind of inflated for a size 23 motor.
What kind of driver (who's brand) and current setting?  Micro-stepping?  How
many micro-steps per step?
I realize that you're getting rid of it but for others who wish to retrofit
your knowledge and experience is priceless.
Thanks
John


> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-13-16 10:53 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Stepper Motors/Drives
> 
> 
> On 13 January 2016 at 18:41, John Dammeyer <jo...@autoartisans.com>
> wrote:
> 
> >> My lathe does not seem to struggle at all with turning cuts within the
> >> torque limit of the spindle, but stall immediately if trying to push a
> >> drill > 10mm.
> >>
> > What are you running on the lead screw?  Direct or belt drive? What size
> > motor? What type of driver? What power supply voltage? Lead screw
> pitch?
> > Size of lathe?
> 
> It's a Chinese 9x20 with a 3.5Nm stepper, 2:1 belt drive 20mm
> ballscrew with 5mm pitch running at 28V and a generic
> black-aluminium-box drive.
> 
> Not one item of which is the way I would do it now.
> 
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
>

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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 13 January 2016 at 19:10, Lester Caine  wrote:
> On 13/01/16 18:52, andy pugh wrote:
>> running at 28V
> One of the problems with the early 'cheap' controllers was the 24V
> supply. Simply replacing the driver with one capable of 45 or so volts

I am sure that is the case. But I am long-past caring about this
machine. The moment the Holbrook is finished it is going on eBay. No
reserve.

-- 
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Re: [Emc-users] Stepper Motors/Drives

[John Dammeyer]

> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
 
> My stepper lathe is fine for normal turning and boring.
> However, one place where CNC can really make life easier on a lathe is
> peck-drilling holes with a drill held in the toolpost.
> My lathe does not seem to struggle at all with turning cuts within the
> torque limit of the spindle, but stall immediately if trying to push a
> drill > 10mm.
> 
What are you running on the lead screw?  Direct or belt drive? What size
motor? What type of driver? What power supply voltage? Lead screw pitch?
Size of lathe?
Thanks
John


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Re: [Emc-users] Stepper Motors/Drives

[Lester Caine]

On 13/01/16 18:52, andy pugh wrote:
> running at 28V
One of the problems with the early 'cheap' controllers was the 24V
supply. Simply replacing the driver with one capable of 45 or so volts
made the stepper motor and hardware actually work reliably and I would
suspect you are subject to the same problem with not being able to get
full power out of the stepper motor. At least 10 times the rated stepper
motor voltage should be a minimum, but the lower voltage motors seem to
work better with a 20x supply.

-- 
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-
Contact - http://lsces.co.uk/wiki/?page=contact
L.S.Caine Electronic Services - http://lsces.co.uk
EnquirySolve - http://enquirysolve.com/
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Rainbow Digital Media - http://rainbowdigitalmedia.co.uk

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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 13 January 2016 at 18:41, John Dammeyer  wrote:

>> My lathe does not seem to struggle at all with turning cuts within the
>> torque limit of the spindle, but stall immediately if trying to push a
>> drill > 10mm.
>>
> What are you running on the lead screw?  Direct or belt drive? What size
> motor? What type of driver? What power supply voltage? Lead screw pitch?
> Size of lathe?

It's a Chinese 9x20 with a 3.5Nm stepper, 2:1 belt drive 20mm
ballscrew with 5mm pitch running at 28V and a generic
black-aluminium-box drive.

Not one item of which is the way I would do it now.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 13 January 2016 at 21:20, John Dammeyer  wrote:
> What kind of driver (who's brand) and current setting?  Micro-stepping?  How
> many micro-steps per step?

http://www.motioncontrolproducts.com/drives/msd542-microstepping-drive.php?cat=2

Probably max current, 1/4 microstepping.

-- 
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Re: [Emc-users] Stepper Motors/Drives

[Lester Caine]

On 13/01/16 21:20, John Dammeyer wrote:
> 495 oz-in sounds kind of inflated for a size 23 motor.
Only 3.5Nm ... we are seeing 4Nm NEMA23 now, but I've standardised on
the 3Nm as an alternative to the 1.8Nm and it's only a few pounds more.
They need 4Amp drivers though, so the 3Amp limit of the NatSemi chips is
a problem :(

-- 
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-
Contact - http://lsces.co.uk/wiki/?page=contact
L.S.Caine Electronic Services - http://lsces.co.uk
EnquirySolve - http://enquirysolve.com/
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Rainbow Digital Media - http://rainbowdigitalmedia.co.uk

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Re: [Emc-users] Stepper Motors/Drives

[John Dammeyer]

Lester, 
I guess that's what I meant.  The 3A drive is the issue.  The motors are
getting better with the same amount of 3A current.
John


> -Original Message-
> From: Lester Caine [mailto:les...@lsces.co.uk]
> Sent: January-13-16 3:08 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Stepper Motors/Drives
> 
> 
> On 13/01/16 21:20, John Dammeyer wrote:
> > 495 oz-in sounds kind of inflated for a size 23 motor.
> Only 3.5Nm ... we are seeing 4Nm NEMA23 now, but I've standardised on
> the 3Nm as an alternative to the 1.8Nm and it's only a few pounds more.
> They need 4Amp drivers though, so the 3Amp limit of the NatSemi chips is
> a problem :(
> 
> --
> Lester Caine - G8HFL
> -
> Contact - http://lsces.co.uk/wiki/?page=contact
> L.S.Caine Electronic Services - http://lsces.co.uk
> EnquirySolve - http://enquirysolve.com/
> Model Engineers Digital Workshop - http://medw.co.uk
> Rainbow Digital Media - http://rainbowdigitalmedia.co.uk
> 
>

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Re: [Emc-users] Stepper Motors/Drives

[Gregg Eshelman]

On 1/13/2016 12:28 PM, andy pugh wrote:
> On 13 January 2016 at 19:10, Lester Caine  wrote:
>> On 13/01/16 18:52, andy pugh wrote:
>>> running at 28V
>> One of the problems with the early 'cheap' controllers was the 24V
>> supply. Simply replacing the driver with one capable of 45 or so volts
>
> I am sure that is the case. But I am long-past caring about this
> machine. The moment the Holbrook is finished it is going on eBay. No
> reserve.

I'm still working on a 9x20 CNC conversion. Using a ballscrew linear 
actuator mounted onto the front of the bed to drive the carriage.

Got any pics of yours? where are you located?


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[Emc-users] Stepper Motors/Drives

[Rick Lair]

Hey Guys,

I have never dealt with stepper motors/drives and one of the guys at our 
shop is kicking around converting and old 9x30 Southbend lathe to cnc 
using Linuxcnc. Are there any recommendations on maybe some kits with 
all the power stuff (motors, power supplies, cables, etc,) that anybody 
recommends. I am up in the air on the control hardware, but I can handle 
that, I just don't know where to start on sizing/selecting the stepper 
stuff.


-- 

Thanks


Rick Lair
Superior Roll & Turning LLC
399 East Center Street
Petersburg MI, 49270
PH: 734-279-1831
FAX: 734-279-1166
www.superiorroll.com


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Re: [Emc-users] Stepper Motors/Drives

[Bruce Layne]

I've had good luck with the stepper kits for CNC conversion on eBay, 
from Wantai or Wantmotor or Longs Motors.  These are Asian imports, but 
the quality is good.  You get the stepper motors, motor drives, DC power 
supply to drive the motors and a parallel port card.  You can buy kits 
with as many axes as you need, and whatever size stepper motors you 
need.  For the 9X30 lathe, I'd try to use medium to large sized NEMA 42 
motors.

Try searching eBay for NEMA 42 kit.  Here's the first thing I found.  
You may want larger motors with more torque.

www.ebay.com/itm/321370356701

I always get the kit versions with one motor controller per axis, rather 
than a single board with all the motor drivers together. It's a bit more 
device mounting and wiring, but I like the modularity.  I've never blown 
up a stepper driver, but I want to be able to quickly replace a single 
driver and get back to business.

Speaking of downtime and replacement parts Most times, I'll buy a 
kit with one more axis than I need, so I have spare parts.  Many times, 
I'll install the extra motor driver in the electrical panel. It's hard 
to lose the spare that way, and it's awfully handy a year later when I 
decide I want a 4th axis on a mill or a homemade bar feeder on a lathe.

For stepper motor CNC conversions, I've always found the parallel port 
I/O to be good enough, fairly easy and inexpensive.  Mostly, I keep 
doing what I know how to do.  However, a good case could be made that a 
PCI card for I/O and motion control is much nicer and only a little more 
expensive.



Chatty Post Ramble:
I'm heading back into CNC mode myself.  I have a few unfinished CNC 
projects to wrap up, but I suddenly developed a business need that is 
pushing the 24"X24" CNC router ahead of the partially finished 
projects.  I have a new product that requires me to machine ABS plastic 
shells from 24" square sheets and... this is the geeky cool part... use 
the CNC router to 3D print RTV silicone like a low resolution 3D 
printer.  The prototyping looks promising.  I'll post a video when I get 
it working, probably in a month or two.  Today's project - I have 150 
lithium batteries arriving for the electric bike I'm building.  Perfect 
e-bike timing.  It's 12 F outside. #GeekLife



On 01/13/2016 11:09 AM, Rick Lair wrote:
> Hey Guys,
>
> I have never dealt with stepper motors/drives and one of the guys at our
> shop is kicking around converting and old 9x30 Southbend lathe to cnc
> using Linuxcnc. Are there any recommendations on maybe some kits with
> all the power stuff (motors, power supplies, cables, etc,) that anybody
> recommends. I am up in the air on the control hardware, but I can handle
> that, I just don't know where to start on sizing/selecting the stepper
> stuff.
>
>


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Re: [Emc-users] Stepper Motors/Drives

[andy pugh]

On 13 January 2016 at 16:09, Rick Lair  wrote:

> I have never dealt with stepper motors/drives and one of the guys at our
> shop is kicking around converting and old 9x30 Southbend lathe to cnc
> using Linuxcnc

My Chinese 9x30 is OK on the X with a 2.5Nm stepepr but a bit weak on
the Z with a 3.5Nm stepper.

If I was converting a lathe using steppers (and I am not, I am
converting using servos) then I think I would be looking at the
new-fangled closed-loop steppers.

For Z probably:
http://www.ebay.com/itm/121787201520
And something a bit shorter in the hope if tucking it back underneath
the saddle for X
http://www.ebay.com/itm/111796968667

That is just an indication of what I am talking about, not in any way
a recommendation of manufacturer or supplier.

Squeezing a ball-nut into the X axis is often difficult. It is also
possibly unnecessary. If there is one place where backlash
compensation stands a good chance of working it is the X-axis of a
lathe. it is never much of a problem with a manual lathe, is it?  I
don't think I have ever made a lathe cut where the X axis cutting
force changed direction.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Stepper Motors/Drives

[Karlsson & Wang]

> Hey Guys,
> 
> I have never dealt with stepper motors/drives and one of the guys at our 
> shop is kicking around converting and old 9x30 Southbend lathe to cnc 
> using Linuxcnc. Are there any recommendations on maybe some kits with 
> all the power stuff (motors, power supplies, cables, etc,) that anybody 
> recommends. I am up in the air on the control hardware, but I can handle 
> that, I just don't know where to start on sizing/selecting the stepper 
> stuff.

You have to find suitable voltage and currents for the stepper motors.

Nicklas Karlsson

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Re: [Emc-users] Stepper Motors/Drives

[Jon Elson]

On 01/13/2016 10:09 AM, Rick Lair wrote:
> Hey Guys,
>
> I have never dealt with stepper motors/drives and one of the guys at our
> shop is kicking around converting and old 9x30 Southbend lathe to cnc
> using Linuxcnc. Are there any recommendations on maybe some kits with
> all the power stuff (motors, power supplies, cables, etc,) that anybody
> recommends. I am up in the air on the control hardware, but I can handle
> that, I just don't know where to start on sizing/selecting the stepper
> stuff.
>
>
If you haven't bought anything yet, why not price out a 
servo-controlled system?  (Warning - tooting my own horn 
here) Pico Systems has the PWM controller system.  For brush 
motors, it will cost $500 for the controller and motor 
drives, for brushless it will be $550.  You will still need 
a power supply for the drivers, and the motor/encoders 
themselves.  Automation Technologies (formerly Keling Inc.) 
have some very affordable servo motors. 
http://www.automationtechnologiesinc.com/

The down side with open-loop steppers is you may not know 
when they have lost steps.  Steppers lose torque 
dramatically as the speed increases.  Servos have constant 
torque available up to the top speed, and the encoders 
provide position feedback all the time.

Jon

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Re: [Emc-users] Stepper Motors/Drives

[John Dammeyer]

Hi Rick,
This is a question that is asked all the time on the E-Leadscrew group. 

I have a South Bend Heavy 10L with a taper attachment so I haven't yet
gotten around to powering the X axis.  I have a 280 oz-in stepper through a
2:1 belt drive on the Z in order to be able to cut metric threads using the
ELS.  Part of the reason is, I don't care as much about really fast traverse
speed and with the back gear, the 2:1 stepper (about 300 RPM lead screw
speed) can keep up with any threading speed I might throw at it. That way I
could use the on board 3A 48V stepper driver included in the ELS kit.

On similar sized lathes others have gone to direct drive with size 34 motors
that have a torque between 500oz-in and 900 oz-in.  Although expensive
compared to far east imports the GECKO driver is good to 8A I believe and
80V and work on either size motor.  Start with a 500 oz motor and if you
find the torque too low move it to the cross slide and buy a 900 oz for the
carriage.

What I always suggest for people who are trying to augment a lathe that has
missing gears is start with an ELS and just the Z axis.  If  it turns out
the motor is a bit small you can always use it on the cross slide since that
doesn't take as much power.  Then upsize to a size 34 and a GECKO for the
carriage.

What I did with my South Bend was to create a shaft adaptor onto which I
milled HEX flats to take a 1" socket.  I tried measuring with my torque
wrench  how much torque it would take to twist the lead screw while cutting
steel.  That was a useless endeavor since it didn't even move the needle.

So back to basics with a flex handle on the 1" socket and 1' away I started
adding weight.  Each oz  would be 12 oz-in.  As I recall it took very little
to move it.   Perhaps 50 oz-in.  I looked at the torque curve for the 280
oz-in motor and at about 750 rpm with the 2:1 belt drive I was still in the
motor spec for motion so that's the way I went.

BTW. I used the same process with my Knee on my mill and found a 500 oz-in
size 34 would work with 3:1 so I initially drove it with the ELS 3A drive
and series connected motor.  It did work but the speed was painfully slow
before it lost steps and locked up.  However that happened at the exact
point in the torque curve of the motor connected and driven as it was.
Final solution there was a GECKO, and 900 oz-in parallel connected winding
drawing 6A and 48V.

For a 9" lathe you can use a 3A size 23 stepper and 2:1 reduction drive at
the expense of rapid speed.

John Dammeyer
"ELS! Nothing else works as well for your Lathe"
Automation Artisans Inc.
http://www.autoartisans.com/ELS/
Ph. 1 250 544 4950




> -Original Message-
> From: Rick Lair [mailto:r...@superiorroll.com]
> Sent: January-13-16 8:10 AM
> To: Emc Users
> Subject: [Emc-users] Stepper Motors/Drives
> 
> 
> Hey Guys,
> 
> I have never dealt with stepper motors/drives and one of the guys at our
> shop is kicking around converting and old 9x30 Southbend lathe to cnc
> using Linuxcnc. Are there any recommendations on maybe some kits with
> all the power stuff (motors, power supplies, cables, etc,) that anybody
> recommends. I am up in the air on the control hardware, but I can handle
> that, I just don't know where to start on sizing/selecting the stepper
> stuff.
> 
> 
> --
> 
> Thanks
> 
> 
> Rick Lair
> Superior Roll & Turning LLC
> 399 East Center Street
> Petersburg MI, 49270
> PH: 734-279-1831
> FAX: 734-279-1166
> www.superiorroll.com
> 
> 
>

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Re: [Emc-users] Stepper Motors/Drives

[Gene Heskett]

On Wednesday 13 January 2016 11:34:04 andy pugh wrote:

> On 13 January 2016 at 16:09, Rick Lair  wrote:
> > I have never dealt with stepper motors/drives and one of the guys at
> > our shop is kicking around converting and old 9x30 Southbend lathe
> > to cnc using Linuxcnc
>
> My Chinese 9x30 is OK on the X with a 2.5Nm stepepr but a bit weak on
> the Z with a 3.5Nm stepper.
>
> If I was converting a lathe using steppers (and I am not, I am
> converting using servos) then I think I would be looking at the
> new-fangled closed-loop steppers.
>
> For Z probably:
> http://www.ebay.com/itm/121787201520

Thats a decent price for an integrated unit.

I used a 470 oz/in nema 23 on my Z, mounted on the left, sticking out of 
the change gear cover, and made miniature taperlock hubs for 2 of the 
old change gears, which I had converted to metal versions, one to put 
the 40 toother on the motor shaft, and one to put the 80 toother on the 
end of the ball screw, so my Z is geared 2/1.  And with a 16x5 screw, 
can still move 60+ ipm.

> And something a bit shorter in the hope if tucking it back underneath
> the saddle for X
> http://www.ebay.com/itm/111796968667

I did put a piece of a ball screw in the X, more to get efficiency of 
power transfer than for the precision, but with no room under the front 
after I had made a replacement apron to meet up with the ball screws nut 
flange, I extended the rear of the carriage with an alu block, first 
putting an oddball nominally 50 oz motor directly on the rear of the 
screw, but was forced to redo it a bit and put another of the way too 
heavy 470's on it because the 50 just didn't have the cajones to do the 
job. It was being pushed back by the cutting forces.

That extra weight is just enough to unload the front v-way, so the gibs 
had to be snugged up till the z screw was having a hard time moving it.
In retrospect, a set of reduction gears between the smaller motor and the 
oem screw would probably have been a better idea as that would have 
allowed the motor to be raised out of the way above the workpiece, and 
turned around to put its weight over the saddle by a shielded belt drive 
on the rear, even the weight of the triple stack 470 would have been 
much less of a problem, and that alone would have contributed to the x 
accuracy by reducing the tendency for the V-way to be lifted.  I may 
even do that eventually, but thats just changing the color of the 
lipstick on this pig.

I relate this not as a do recommendation, but more as a don't do like I 
did.

My way does have x accuracy problems because of this has a tendency for 
the z screw to pull the carriage, exerting a bit of rotation looking 
down at it from above, lifting it very slightly on the V-way, changing 
the x about 2 or 3 thou when it does.  That however seems to be slowly 
wearing in, and less of a problem as time goes by.  Caused by haveing 
the rear gib snugged up to prevent lift, tipping the tool away from the 
work when turning OD.

I fact, now that I have done it, I don't recommend doing it to any of the 
7xnn series lathes, one should just get a machine thats big enough to 
carry the weight involved in the first place.  Carriage footprint on the 
way's is very important, and the 7x lathes just don't have enough to be 
effective.

Hindsight is always better in my observations. Like putting lipstick on a 
pig, my 7x12 is still a pig. :)

> That is just an indication of what I am talking about, not in any way
> a recommendation of manufacturer or supplier.
>
> Squeezing a ball-nut into the X axis is often difficult. It is also
> possibly unnecessary. If there is one place where backlash
> compensation stands a good chance of working it is the X-axis of a
> lathe. it is never much of a problem with a manual lathe, is it?  I
> don't think I have ever made a lathe cut where the X axis cutting
> force changed direction.

True, its either cutting on the OD, or boring in the ID. 2 separate 
operations normally done by measuring the result of the last cut so 
backlash isn't a problem 99.999% of the time.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Stepper Motors/Drives

[Wayde Allen]

A number of the motor manufacturers Galil, Kollmorgen,  et al have motor
sizing information information and tools on their web pages that may be
useful. I just had to lookup the Kollmorgen page to make certain that I'd
spelled that correctly so here is a link for them.

http://www.kollmorgen.com/en-us/service-and-support/technical/technical-support/

OK, here's Galil's:

http://www.galil.com/learn/motorsizer

I've been working on retrofitting an old dish antenna system, see <
https://www.youtube.com/watch?v=HqAmpVnAuzE> with Galil products with good
luck. However, just for the record that is not using LinuxCNC.

- Wayde



On Wed, Jan 13, 2016 at 9:52 AM, Bruce Layne 
wrote:

> I've had good luck with the stepper kits for CNC conversion on eBay,
> from Wantai or Wantmotor or Longs Motors.  These are Asian imports, but
> the quality is good.  You get the stepper motors, motor drives, DC power
> supply to drive the motors and a parallel port card.  You can buy kits
> with as many axes as you need, and whatever size stepper motors you
> need.  For the 9X30 lathe, I'd try to use medium to large sized NEMA 42
> motors.
>
> Try searching eBay for NEMA 42 kit.  Here's the first thing I found.
> You may want larger motors with more torque.
>
> www.ebay.com/itm/321370356701
>
> I always get the kit versions with one motor controller per axis, rather
> than a single board with all the motor drivers together. It's a bit more
> device mounting and wiring, but I like the modularity.  I've never blown
> up a stepper driver, but I want to be able to quickly replace a single
> driver and get back to business.
>
> Speaking of downtime and replacement parts Most times, I'll buy a
> kit with one more axis than I need, so I have spare parts.  Many times,
> I'll install the extra motor driver in the electrical panel. It's hard
> to lose the spare that way, and it's awfully handy a year later when I
> decide I want a 4th axis on a mill or a homemade bar feeder on a lathe.
>
> For stepper motor CNC conversions, I've always found the parallel port
> I/O to be good enough, fairly easy and inexpensive.  Mostly, I keep
> doing what I know how to do.  However, a good case could be made that a
> PCI card for I/O and motion control is much nicer and only a little more
> expensive.
>
>
>
> Chatty Post Ramble:
> I'm heading back into CNC mode myself.  I have a few unfinished CNC
> projects to wrap up, but I suddenly developed a business need that is
> pushing the 24"X24" CNC router ahead of the partially finished
> projects.  I have a new product that requires me to machine ABS plastic
> shells from 24" square sheets and... this is the geeky cool part... use
> the CNC router to 3D print RTV silicone like a low resolution 3D
> printer.  The prototyping looks promising.  I'll post a video when I get
> it working, probably in a month or two.  Today's project - I have 150
> lithium batteries arriving for the electric bike I'm building.  Perfect
> e-bike timing.  It's 12 F outside. #GeekLife
>
>
>
> On 01/13/2016 11:09 AM, Rick Lair wrote:
> > Hey Guys,
> >
> > I have never dealt with stepper motors/drives and one of the guys at our
> > shop is kicking around converting and old 9x30 Southbend lathe to cnc
> > using Linuxcnc. Are there any recommendations on maybe some kits with
> > all the power stuff (motors, power supplies, cables, etc,) that anybody
> > recommends. I am up in the air on the control hardware, but I can handle
> > that, I just don't know where to start on sizing/selecting the stepper
> > stuff.
> >
> >
>
>
>
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