Drill holes different every time (problem with machine?)

1

I ran this code 3 times and got 3 different holes every time. Look at the circle areas only. There should be one hole in each circle, i.e. one plunge in each circle, however it seems that on each pass, the machine started from a slightly different location. The 2nd pass I just ran the code again. The 3rd pass I rehomed and got yet another new hole on each plunge…

I zeroed the same way before each pass - X and Y from the rail sensors, Z from a touch pad (although that doesn’t matter as much for this because its just drilling straight down).

What could cause this problem? I am worried that there is something wrong with my machine.

drill inaccuracy
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2

Does the same thing occur if you do not re-home/zero between running the same program?

3

Yes - 2nd pass I did not re-home. 3rd pass I re-homed.

4

Why not zero x and y with the probe?

5

I will try the probe tonight and see if I can get consistent plunges. However, the reason to use the rail sensors is this is to drill holes on the waste board for screwing down. So the program is running the entire 4 ft x 4 ft. I wanted to only have one set of holes in my table. Also just learning the machine.

6

If the probe works then that will tell me the inconsistency was coming from the rail sensors. Hopefully that is it!

7

Can you probe your waste board?

8

Hi Ken, sorry for super late reply, I was going through my alerts. I found that the problem was because I had removed the red plastic bushings from the motor couplers, and this caused the motors to not work properly and be imprecise. When I replaced the bushings, everything worked fine!

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