RE: [CAD_CAM_EDM_DRO] camtronics vs gecko

To get good microstepping you need to have the voltage in the 10 - 25 X
the rated motor voltage. Half stepping is very tolerant of low voltage.
What is the voltage rating of your motors?

You say that you are "faulting out". Tell us more. What software are you
using and is the fault something the software is throwing or do you mean
the drive is actually having a hardware fault? I will guess that you may
be using EMC and are seeing a follow error under freqmod.o. If so you
need to tune the PID loop to eliminate the follow errors as they are
totally software derived and related to your increased step rate and
have nothing to do with the ability of the drivers.

Tim
[Denver CO]
Stepper motors, drives, encoders
http://www.KTMarketing.com/CNC.html

> Hi,
>
> Thanks to all for the previous help given, and I have my systems
> running well now. Only some small questions:
>
> With the Camtronics 2A board set for 2A, PS 36VDC, Sherline 2A
> stepper wired for half-coil, and lathe (lead-screw 25.4 tpi), I could
> get up to 16 ipm.
>
> When I switch to the Gecko 201 drivers set also for 2A, 36VDC, I
> could only manage 10ipm.
>
> I thought I can get better speed with the Geckos? What am I doing not
> quite right? What are the others getting?
>
> Perhaps it is limitation of the pulse rate? But it cannot be? because
> if it is the max pulse rate output, the system should just move at
> that speed corresponding to that max pulse rate without faulting out
> irrespective of how high I set the feedrate? But this is not so, as
> the max ipm I quoted was the steppers faulting.
>
> Will be interested to hear what the others are getting. Thanks
>
> lee