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Forum: Troubleshooting Fri 09 November 2012, 07:04
Replies: 85
Views: 79,028
Posted By bradm
I think you've proven that you aren't loosing...

I think you've proven that you aren't loosing steps, so I wouldn't spend money on encoders - you can read more opinions on encoders in general here in the forum.

Try Ross' long calibration method,...
Forum: Troubleshooting Thu 08 November 2012, 21:09
Replies: 85
Views: 79,028
Posted By bradm
You are correct that losing steps would destroy...

You are correct that losing steps would destroy repeatability on the return to a known location. So, if you have repeatability after cutting the inconsistent lengths, it's not lost steps. Of...
Forum: Troubleshooting Thu 08 November 2012, 11:09
Replies: 85
Views: 79,028
Posted By bradm
What are your acceleration settings? Set them so...

What are your acceleration settings? Set them so slow that you can see and hear the accel and decel on every move, and try the calibrations again. You are still describing something that matches up...
Forum: Troubleshooting Fri 02 November 2012, 08:15
Replies: 85
Views: 79,028
Posted By bradm
You're making great progress! The replacement...

You're making great progress! The replacement table looks good as well.

For the calibration question, check your acceleration / deceleration values. If they are too aggressive, you might be...
Forum: Troubleshooting Wed 31 October 2012, 10:53
Replies: 85
Views: 79,028
Posted By bradm
Yeah, Ross covered it. Those rails are probably...

Yeah, Ross covered it. Those rails are probably not worth trying to recover :(

Great photos, though, they make the diagnosis easy. You guys should be in the home stretch now, though.
Forum: Troubleshooting Tue 30 October 2012, 12:12
Replies: 85
Views: 79,028
Posted By bradm
I like Heath's idea (you put shims under the...

I like Heath's idea (you put shims under the bolts at the low spots). Also, note that there are slots to adjust the V-roller heights at at least one corner each of the gantry and car (can't remember...
Forum: Troubleshooting Tue 30 October 2012, 11:52
Replies: 85
Views: 79,028
Posted By bradm
I would be tempted to try to knock the high spots...

I would be tempted to try to knock the high spots off the rails, if you concur that you can manage to not make it any worse. Can you give us a close up photo of what a variation in the rails looks...
Forum: Troubleshooting Mon 29 October 2012, 12:24
Replies: 85
Views: 79,028
Posted By bradm
Ideally, there are are offset bushings on those...

Ideally, there are are offset bushings on those V-rollers that can be used to adjust them - a fraction of a turn should bring the V-roller closer or farther. But you'll first need to confirm that...
Forum: Troubleshooting Mon 29 October 2012, 11:42
Replies: 85
Views: 79,028
Posted By bradm
Check for slop in the Z-Axis v-rollers in both...

Check for slop in the Z-Axis v-rollers in both possible dimensions. (As per Sean's original list of likely mechanical issues). Given what you've found so far, it's likely there are a few other...
Forum: Troubleshooting Mon 29 October 2012, 07:53
Replies: 85
Views: 79,028
Posted By bradm
The shim gives extra opportunities for slippage,...

The shim gives extra opportunities for slippage, and you say "motor shaft does not have any flat spots" - I think you have to take that apart and file two flats on the shaft. Shims are easy enough...
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