CAD CAM EDM DRO - Yahoo Group Archive

reality check...

on 2003-08-20 10:22:33 UTC
OK, given the following:
Application: Rack & Pinion Gantry router, work area is 8' x 13'

Motor Specs:

37.51 oz-in/A (Kt)
25.0 - 30.5 V/kRPM (Kv)
Terminal resistance 0.75 - 1.02 Ohms @ 4A
Max terminal voltage 60V
Max continuous speed 2100RPM
Max peak torque 1500 oz-in
Max peak current 44.5A (unsure)
Max continuous stall torque at maximum motor temp 300oz-in
Max continuous current 8.9A

Reduction Calulations:

a 40:1 drive reduction with 24 d.p. rack, 30t 24 d.p. pinion (effective
circumfrence of 3.926 inches)

desired rapid of 400-500 ipm (approx 100-125 rpm pinion speed)

I calculate I would need a 2.38:1 ratio from motor to reduction unit, does
this ((125*40)/2100=2.380)
will give me a torque at 20 amps(gecko 340 max current) of
(37.51*20)/2.38*40=12,608 in oz)or 788 in lbs of force.
>anybody remember how to calculate force at the tool with a rack & pinion
drive?

1024 count quadrature encoders * 4= 4096 counts per rev, 2100 rpm=35 rps,
35*4096=143,360 pulse frequency, in excess of
mach 2's limit of 45 Khz, I'll have to use a pulse multiplier of either
x5(28672 khz) or x10(14336 khz).

If I go with x5, I end up with about 3500 steps per inch, x 10 is around
1750 steps per inch.

any problems with my math???? suggestions as to which way to go (x5, x10)



Erie Patsellis
Shelbyville Design & signworks
217-774-4444
signworks@... <mailto:signworks@...>

<mailto:signworks@cond>

Visit our website at: http://www.shelbyvilledesign.com

Discussion Thread

Erie Patsellis 2003-08-19 09:34:13 UTC Electrocraft Motor Specs Chris Baugher 2003-08-19 21:24:17 UTC Re: [CAD_CAM_EDM_DRO] Electrocraft Motor Specs Erie Patsellis 2003-08-20 07:59:15 UTC RE: [CAD_CAM_EDM_DRO] Electrocraft Motor Specs Erie Patsellis 2003-08-20 10:22:33 UTC reality check... Leslie M. Watts 2003-08-20 14:07:35 UTC RE: [CAD_CAM_EDM_DRO] reality check... Erie Patsellis 2003-08-20 15:05:45 UTC RE: [CAD_CAM_EDM_DRO] reality check... Leslie M. Watts 2003-08-20 16:12:46 UTC RE: [CAD_CAM_EDM_DRO] reality check... Mariss Freimanis 2003-08-21 20:39:42 UTC Re: reality check... Chris Baugher 2003-08-30 21:22:51 UTC Tool changing? Raymond Heckert 2003-08-31 19:56:29 UTC Re: [CAD_CAM_EDM_DRO] Tool changing? wanliker@a... 2003-08-31 23:24:33 UTC Re: [CAD_CAM_EDM_DRO] Tool changing? Jon Elson 2003-09-01 21:54:05 UTC Re: [CAD_CAM_EDM_DRO] Tool changing? baugher_c 2003-09-02 18:56:28 UTC Re: Tool changing? Jon Elson 2003-09-02 21:34:27 UTC Re: [CAD_CAM_EDM_DRO] Re: Tool changing? Chris Baugher 2003-09-02 22:20:37 UTC Re: [CAD_CAM_EDM_DRO] Re: Tool changing? Vince Negrete 2003-09-03 01:30:24 UTC Anyone get EMC on SUSE yet? Vince Negrete 2003-09-03 22:36:54 UTC Anyone get EMC on SUSE yet? Paul 2003-09-04 10:19:08 UTC Re: [CAD_CAM_EDM_DRO] Anyone get EMC on SUSE yet? Vince Negrete 2003-09-04 17:48:38 UTC Anyone get EMC on SUSE yet? Markwayne 2003-09-07 12:47:10 UTC Re: [CAD_CAM_EDM_DRO] Anyone get EMC on SUSE yet?