Re: [CAD_CAM_EDM_DRO] Encoder count selection for G320

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/

have some great docs online.



Alan