RE: [CAD_CAM_EDM_DRO] Newbie to CNC - 400 step/rev motors

Kevin,

Welcome to the hobby. Your checkbook and credit cards will never be safe
again <g>.

You can use 400 step per rev motors just as well as 200 step/rev motors.
Most people don't because they are less common and frequently cost more.
You can use any other step/rev count just as well. I used some 192
step/rev motors on my Shoptask for a while. The only potential drawback
is that you will end up with a tiny step increment with a micro step
controller. If you need a high rapid rate you may run out of step
generating ability on your contoller unless you use a low step division
from the controller (meaning run it as half step or quarter step). The
lower micro step rates will likely not be as smooth and resonance
resistant as running at the higher micro step rate.

You can use the different step/rev motors regardless of the drive you
use. The drive does not have to support the various micro step levels
like the Xylotex does to allow you to use the 400 step/rev motors. The
advantage to having the micro step adjustment is that you can tailor it
to the particular application and use the highest microstep ratio that
still allows your controller to put out an adaquate step rate.

If you have not purchased your Xylotex drive yet you may want to wait. I
am working with Jeff on a complete turn key controller. It will have the
power supply, breaker, E-stop, and drives all integrated into the same
box. A 4 axis version will go for $500 and a 3 axis just slightly less.
The 110 VAC for the spindle motor is routed through the box and
controlled by the E-stop. When you hit the red mushroom on the top of
the controller box it will remove power from the drives, the spindle,
and signal the e-stop to the controller software. Jeff is working on
adding spindle on/off control to the package. As soon as that is done it
will be ready for purchase.

If you want to roll your own or have the drive already I like the cases
from www.sescom.com and I frequently use the power supplies and
transformers from www.MPJA.com

Tim
[Denver, CO]
Sherline products at Deep Discount
Mach1 & DeskCNC with credit card ordering
www.KTMarketing.com/Sherline
Now selling Visual Mill

> -----Original Message-----
>
>
> I am a newcomer to the home-built CNC hobby. I am currently
> in the process of planning the build-up of my CNC-ready Taig
> mill. I'm still debating over controllers but leaning towards
> Xylotex. I'm on the search for stepper motors and have found
> many different kinds. I've read through the CNC for Hobbyists
> document and I'm stuck on the part that covers the number of
> steps per rev. Am I only looking for 200 step motors or can I
> also use 400 step motors? From reading the on the Xylotex
> website I see that it can be configured for full, 1/2, 1/4,
> and 1/8 step. Will this alllow me to use motors besides a 200
> step? Will this mean higher resolution? I have found a motor (Vexta
> #PK268M-02A) Rated around 190 oz-in. 4.5 VDC, 2 Amps, 400
> Steps/Rev, Step Angle 0.9°, 6 Wire Leads, 2.25 Ohms. Does
> this sound like a possible chioce to match up with this
> controller? Also, does anybody have a source for a housing
> for the controller, power supply and misc.?
>
> Thanks,
> Kevin
>
>
>
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