Quoth bodge...@gmail.com.....
>
>On 5 September 2013 16:33, Russell Brown <russ...@lls.lls.com> wrote:
>
>> Is this the sort of thing that a screw compensation table is meant to
>> deal with? If so, how do I actually measure the numbers for the table?
>
>Then just run up the table, G0 X10, note the reading and make a comp
>file entry of 10,9.92, and so on to the end of travel, then come back the
>other way, filling in the third column.
OK. If I do that, given my X backlash of 0.165mm and an assumed feed of
9.92mm for every 10mm commanded, then I end up with a table like:
00.00 00.00 0.165 (10.085-9.92)
10.00 09.92 10.085 (20.005-9.92)
20.00 19.84 20.005 (29.76-9.92+my_backlash)
30.00 29.76
Does that look right?
Given 600mm travel on the X-axis, what table intervals make sense?
>Or have I misunderstood the question?
Well..... You missed bits... but it was multi-part :-)
Were the 'errors' I showed (~.015mm over a 50mm move) in the right ball
park for a non-ball-screw benchtop mill driven by steppers?
Should I expect a commanded 50mm move to travel 0.040mm less than 50mm ?
Does the variation in actual distance moved indicate missed steps? (the
actual move varied with different microsteppings)
Am I trying to fix something that's 'normal' ?
--
Regards,
Russell
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| Russell Brown | MAIL: russ...@lls.com PHONE: 01780 471800 |
| Lady Lodge Systems | WWW Work: http://www.lls.com |
| Peterborough, England | WWW Play: http://www.ruffle.me.uk |
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