Re: [CAD_CAM_EDM_DRO] Encoder count selection for G320

Alan is right,
OTOH-
You will get much more than 30 ipm - and it wont be too important. You
might bet about 200 ipm.
You should get (engineer basic rules)
- minimum 16 teeth small pulley
-max 3 (3.3) transmission
If you can spare 20$ extra, get HTD 5 mm pulleys + belts. Dont use xl
(stretch, like rubber).
250 is ok.
500 is ok.
Depends on your sw ... and higher is better.
IF you are going to use emc, definitely use the 500 or more.


Alan Rothenbush wrote:

>
> dcassyc1 wrote:
> > Hello all,
> > I want to use homeshopCNC servo motors on a router. The motor is rated
> > 72VDC and 4200 rpm no load speed, 850 in oz peak torque, 170 oz in
> > continuous torque. My plan for the gantry drive is to go from the
> > motor through a 1:3 reduction and drive a jackshaft with 14 tooth XL
> > gears on each end, which rack over stationary belts fixed to the
> > frame. I calculated the gantry mass at 175lbs aprox. I'd like to
> > achieve 30 ipm traverse speeds for the gantry and carriage. Is that an
> > unrealistic speed?
> > I don't know how to make the choice between 250 or 500 line quadrature
> > encoders. The 'files' sections servo motor files were empty. From what
> > I remember, top speed depends on pulse throughput from the PC. The
> > control software is CNCPRO, Turbocnc, and EMC. Would the 500 line
> > encoder provide greater precision?
> > Would anyone care to show me how to make the line count selection for
> > the Gecko G320 and advise on the PC speed/performance requirements?
>
> One quick comment .. a 14 tooth pulley is pretty small considering what
> you're trying to do; there is not a lot of wrap around that pulley.
>
> You may want to look at some of the technical guides online for a
> recommendation. Sterling Drive Products
>
> http://www.sdp-si.com/ <http://www.sdp-si.com/>
>
> have some great docs online.
>
> Alan
>
>