So whats the deal with holey calibration

[Joshua]

@blurfl

While you’re polishing things

What is polish? A type of sausage?

@blurfl

While you’re polishing things
• how about indicating how the measurements are to be made in the instructions? I assumed center-to-center, but there have been times in the past when folks talked about near-edge to near-edge.
• while precision is desirable, wouldn’t it make sense to round the error in the calibration result screen to the nearest .05mm instead fo showing error values smaller than that?

This is good feedback. I will do my best. When it is merged, anyone can make these updates.

@blurfl

• The tool path for Point6 is vulnerable to friction - consider moving to a point ~10cm above and 2 or 3 cm beyond it then moving back to the final point to reduce this.

I like this observation. It is like the cutting process is creating some potential biases. In addition to this, I was just recently thinking the timing of the holes may cause some issue. We know the position controller isn’t perfect. Since the gcode drills immediately after arriving at the point, it doesn’t give the controller a chance to stabilize. I think there should be a pause before drilling the hole.

@dlang

fair point, but that’s papering over the problem, if friction affects the
position like that, it will affect the cut like that. we need to test and find
if this is really a problem (and if it is, walk the user through fixing it and
then re-drill the holes)

I agree with this. I recommend a 12 ft top beam because of this. I still think the calibration could be slightly less biased, if this friction wasn’t built in.

I tried to resolve the conflicts with the main Firmware fork. Based on everything I see, I think it is OK; however, I didn’t personally test it. So, it should be ready for another alpha test.

BTW, I think someone asked for a link to the instructions on how to use Holey Calibration. Here is the post:

Holey Triangular Calibration

For the bravest among you, The GUI could be testable. Everything is in place, and should be functional. Remaining Issues There is a popup at the end of all the calibration that warns you about exiting early. It shouldn’t be there I haven’t actually tested the cut step (the one step before you enter your measurements). I did my best, but your machine might burn your house down as soon as you click “go”. It should be checked. I haven’t actually re-downloaded the repository onto my machine to…