Kyle wrote:
The angle of the belt? I have a digital angle finder and could use that to see how it relates to the ground. Not sure how level the frame is though, might have to measure that and factor it in too.
the angle of the arms, or more specifically, how much further they swing with
the ears clipped. with a digital angle finder, you should be able to put it up
against a wall, move the arm to one extreme, zero the angle finder, then move it
to the other extreme.
David Lang
Okay, I see what you mean. I’ll measure that and post here shortly.
@dlang about 58-59 degrees for the top arms, 56 for the BR arm when I rotated the router cable out of the way, and 50 for the BL arm which contacted the Z mount as you explained.
thanks, two more requests
the belt end does not have straight sides, It looks like you measured against
the side while the belt end was square against the arm. could you measure both
sides of the belt end?
can you measure two arms against the sides towers (so I can figure out how
close the top left and bottom left arms can get to each other)
that should let me draw out everything and get all the angles
David Lang
I zeroed the angle gauge before rotating the arm, so while it’s a little skewed the delta should be the same, right?
Also trying to calibrate now, and while the arms no longer hit anything, the top far belt, when on either far side of the workpiece, releases a bunch of belt then tries to measure itself (can see the motor running.) seems like maybe something up with the software or calibration procedure? It’s tight when jogging to the next position.
Kyle wrote:
I zeroed the angle gauge before rotating the arm, so while it¢s a little skewed the delta should be the same, right?
for each arm, yes. the added two measurements will let me figure out how the 4
arcs you plotted match with each other
David Lang
Kyle wrote:
Also trying to calibrate now, and while the arms no longer hit anything, the top far belt, when on either far side of the workpiece, releases a bunch of belt then tries to measure itself (can see the motor running.) seems like maybe something up with the software or calibration procedure? It¢s tight when jogging to the next position.
does it pull tight before moving?
David Lang
Yes, it takes the slack back up, stops, then the top distant belt goes slack. Trying a second calibration now.
is this with the new calibration released in the last couple of days.
David Lang
No, it’s 0.87, the one with the frame stretch procedure.
Have some time to test today, any idea why the too far belt is going slack on calibration @dlang or @bar ?
Is there something in the software that tries to account for hitting the frame? That kinda seems like what’s going on.
Kyle wrote:
Is there something in the software that tries to account for hitting the
frame? That kinda seems like what¢s going on.
no there isn’t.
David Lang
Any theories on why it’s miscalculating the expected length of that arm?
Might upload a fresh yaml file and try calibrating again in case it’s some leftover setting. Not really sure what else I can test.
Upgraded to 0.88.0 tonight and got the machine to successfully calibrate at 2300x1100 with a 9x9 grid. Fitness was about 0.55 whereas with v0.87.1 it would only get to 0.40 or something. Still had the issue with a slack belt on the edge while calibrating, but seemed to work any way.
The exciting part is with the ears removed and a calibration right to the edges of the workpiece, the scaling issue was reduced yet again. 1200mm from the origin it was only off by about -2mm in either direction on the X axis. Jogging to 800 it was only off by about 1mm. I might try another cut and see if this has solved the scaling issue.
Last notes:
Kyle wrote:
@dlang do you know what an ideal angle for the belts would be? Or how to go
about calculating that?
We do not, I aim to have the belts as flat as possible, but that’s not basd on
experimentation (and I run flat, not near-vertial)
David Lang
Makes sense. I’ll probably just try to match the height/angle on BL since that’s the flattest one. Thanks.
Kyle, can you snap a couple more photos of exactly where you chopped? I’m having a hard time visualizing it…
