After reading through the forum, I’ve noticed a lot of similar problems. The ones that come to mind are:
- Having to adjust potentiometer
- Unshielded wire issues (homing, limit switches, etc.)
- Defective spindle
- Belt slipping
- Spindle misalignment/poor alignment
I was wondering if someone could recommend a good material, pattern, and speeds to use to test for any problems with any of these noted. Sort of a “hello world” for CNC, while running the spindle at greater than recommended speed and cut depth.
I was considering a series of circles, triangles, and squares of various depths on 3/4" MDF, at 50 in/min and .079" cut depth per pass (both 125% values recommended in Easel). The shapes could be both overlapping and spaced apart such that the edge of one is 0.XXX" from the next one, which would allow one to use calipers to measure distance and diameters.
The purpose of this would be to test the CNC after installation, and as necessary if problems are encountered, in order to be able to nail down which problems may be present. Having a “typical” test would make regular troubleshooting a LOT easier, since there could be photos to show what each problem would look like. For example:
- Stair steps on a pattern with multiple passes could indicate misalignment along the X or Y axis (with photo to match).
- Having a dozen specific spacings marked on and between features would allow someone to figure out if a belt is slipping.
- If the test piece comes out looking MUCH rougher than one pictured by the designer, it could indicate a worn bit or low spindle speed.
With a more thorough list of issues than what I listed above, I imagine it would be (relatively) easy for the designers at Inventables to come up with a pattern and troubleshooting guide to go with it that could address 99% of the problems that seem to keep coming up.
I wish I could help more with this, but I’m stuck on the sidelines until my CNC gets delivered. It would be great to have a set troubleshooting/calibration pattern to use when I get my new toy though.
Manhattan Wood Project