Revision as of 09:20, 13 November 2021

Friction

11/14/21 gets us 13-23 lb friction on Y1. At times static friction is overwhelming and axis doesn't start. X motion is stronger. 20 lb stopping force is available at 500 mm/sec on x and y. Z had no problems (due to slow speed?)
Y1 has more friction than Y2 - due to autoparallel-Y piece being on Y1 side and less stiff? Y1 axis rotates around the Y axis as does slide into y-autoparallel piece. Y2 doesn't due to stiff x connection.
Without increasing force, we are limited to safe zone of 2000 mm/sec?
- Data collection: measure upper speed where drive force remains 20 lb throughout entire length of axis - on x, y, and z. This is 30% of theoretical Max of about 64 lb drive (300 is in)

Y1 belt kept rubbing on idler side. Idler was slightly slanted, and wobbly pulley on x motor did not help.
Enlarging hole in pulley from 6 to 8 mm is difficult with mag drill. Did it in 0.4 mm drill increments - drilling is not self-alogning even with this small increment
Z pulley wobbly and bent from too string vice hold
Z and y1 pulleys replaced - these were wobbly
Drilling was done in 1/64" (0.4 mm) increments starting with 1/4". Motor shafts are 8 mm, pulleys were 6 mm
X autoparallel is implemented with oversized x mount holes on x1
Y autoparallel is implemented with autoparallel y 3D prints and nylon bushings; nylon bushings are longer than needed
Y and Z only use hollow shaft. Hollow shaft uses nylon bushings, solid shaft uses bronze oiled bushings

At half inch cutting speeds of 20 ipm or 500 mm/min - this is prior to pulley size calibration of about 30% larger pulley
11/12/21 gets us 25 lb towards negative y1, 20+ for both directions of y2, and 20+ lb for both directions of x
Positive y1 - data?

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