On 07/15/2011 09:40 AM, gene heskett wrote:
> On Friday, July 15, 2011 10:37:53 AM Daniel Rogge did opine:
>
>> If you swap the X and Y drivers it will be fairly easy to determine
>> whether the problem is with the driver (as Gene suspects) or with
>> friction or mechanical linkages (as Jan suspects). If the problem
>> stays on Y after swapping drivers, then your driver is absolved,
>> leaving only mechanical or step signal generation problems as
>> possibilities. You can distinguish between these last two by only
>> swapping the control leads between drivers while leaving the motor
>> leads hooked up as they are now.
>>
>> Rogge
>
> And in any event, please do not silently fix it, the OP should post what
> the OP did so that we'll have better info to refer to the next time it
> happens.
>
All,
Thanks for all your pointers. I swapped the X and Y connectors at the
Geckodrive
controller and the problem rotated 90 degrees. I measured about 0.0067 inches
of backlash
on the Y axis. I can turn the Y shaft about 10~15 degree with no movement,
which agrees
with calculated value of 12.06 degrees of backlash. ( 5 TPI screw )
The X axis backlash is about 0.0005. Both shafts turn freely when power is not
applied.
I've found some reference on the Hossmachine site that the ballnut backlash can
be
improved by putting in larger bearings. I'll try that.
There seems to be another problem though. I see the X and Y DRO values changing
sometimes
without any motor movement. This only happens at low speeds.
I'll investigate that further after I address the backlash issue.
Thank all for your help. I will let the list know how this was resolved.
Regards,
Andy
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