RE: [CAD_CAM_EDM_DRO] small 3-axis micro stepper

Your expectations with regard to speed may be overly ambitious. The enco
mill/drill table uses a 10 TPI acme leadscrew. The leadscrew has cast
iron thrust blocks. I modified mine for needle thrust bearings. And
since I used a timing belt pulley to drive it I would use at least a 2/1
ratio with a 250 oz in motor. Then at 200 steps per rev times 2 (ratio)
times 10 TPI= 4000 steps per inch and you would need 20 revs per inch,
times 60 seconds and you would need to get 1200 RPM of the motor to run
the table at 60 IPM. I would think that 30 IPM is more realistic but
still ambitious and 20 IPM is more likely.
Additionally, the enco mill drill table suffers from a few other
problems like some of the drive nuts for the XY axis have a lot of slop
in them and they have at about .010 backlash in them. You can modify
this relatively inexpensively but you need a lathe to make the changes.
You will probably need a lathe also to make couplings or bore out
pulleys to fit the leadscrews.
On my one of my enco mill drill tables ($119) and I have modified
several, I modified the XY axis drive nut and installed anti backlash
nuts to reduce the slop and it seemed to work quite well. I also found
that the leadscrew pitch was off by .001 per inch. So I have another
mill/drill table setting in my shop where I was going to retrofit all
the lousy parts for better parts including replacing the leadscrews but
haven't gotten to it.
I'll look to see if I have any pictures of the motor mounts and how I
installed them before I sold them.
Dan
Dan
-----Original Message-----
From: J [mailto:jaredts@...]
Sent: Monday, September 16, 2002 7:23 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] small 3-axis micro stepper


OK--one vote so far that the 2.5 amp bipolar drive from xylotex may not
be enough (thanks Bob). Anyone have experience converting an Enco
mill/drill table to cnc? Anyone pushed their 2.5 amp cnc to the limit
and want to share your performance? Any help would be appreciated--just
keep in mind that I am on a tight budget and am no E.E. Here are the
specs. on the Enco slide table:
*11" X 7-1/2" travel
*10TPI leadscrews
*The y-axis probably moves 35-40lbs with an empty table
Do I have any choice but to buy a high dollar cnc controller (geckos are
high dollar to me!)? The ideal system would be able to make cuts with a
router or milling head (cutting steel would be nice), have a 60 i.p.m.
rapid and cut at around 10 i.p.m. minimum. By the way, xylotex
suggested a nema 23 powermax II 253oz-in Bipolar motor (2.3 amps bipolar
series). Thanks for any replies.

Robert Campbell wrote:Jared,

First determine what stepper motors you are going to use with them. The
xylotex board is limited to 35 volts.

As a general rule, if you divide the 35 volts by 20 you would get 1.75
volts
as the voltage for the stepper motors.

You can ask others, but I think that 2.5 amps may not be enough.

You may want to save up your money and buy Gecko drives.

Bob Campbell

----- Original Message -----
From: "J"
To:
Sent: Monday, September 16, 2002 12:54 PM
Subject: Re: [CAD_CAM_EDM_DRO] small 3-axis micro stepper


>
> For anyone kind enough to offer 2 cents:
> This stepper driver from xylotex looks like a good setup at a great
price.
Before I go out on a limb and buy one, does anyone see anything wrong
with
this system for a small cnc? I have an Enco mill/drill table that is
slightly larger and heavier than a Taig's. I don't know what to use as a
spindle yet (I guess just a router for now). Is 2.5 amps bipolar enough?
I
would greatly appreciate any help from those more experienced than me
(probably 99% of those reading this right now). My problem is that I
can't
afford geckos, and don't want to buy a unipolar driver board and be
disappointed with the performance.
> Thanks,
> Jared
> bsptrades wrote:
> Just spotted this outfit on e-bay looks to be a nice simple package
> using the newer allegro chips. The price seems fair at $90 for small
> projects
>
> http://www.xylotex.com/
>
> Brian
> BSP
>
>
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