Z axis calibration

Troubleshooting
21

usually when people have this sort of problem, the bit is slipping in the chuck

do you have (or can you get) a cheap digial caliper (I find this on Amazon
1/2/4 Pack Digital Caliper, 6in Electronic Digital Caliper Measuring Tool, Construction with LCD Screen, Easy Switch from Inch to Millimeter(1 Pack, 6in Plastic): Amazon.com: Industrial & Scientific )
and check how far the machine actually moves (try a few different distances)

the steppers are 200 steps/rev and the pitch of the lead screws is very precise,
it should not be neccessary to tweak the settings about how far it moves with
each step (this is in the maslow.yaml I believe, can you post that?)

David Lang

1 Like
22

I do have a digital caliper.
My Maslow file is attached
maslow20150117.yaml (5.3 KB)

23

Grim wrote:

I do have a digital caliper.

make sure you are checking the movement of the frame to the sled, not the bit
(to eliminate any error caused by the bit slipping)

David Lang

24

Surely if the bit is slipping the depth would be less.
The force of the maslow moving the bit down would push it up into the collet and so result in a shallower cut.
Iā€™m seeing the opposite of that - itā€™s deeper.

25

Grim wrote:

Surely if the bit is slipping the depth would be less.
The force of the maslow moving the bit down would push it up into the collet and so result in a shallower cut.
Iā€™m seeing the opposite of that - itā€™s deeper.

No, Iā€™ve mostly seen it slip out from the router (even when using stright bits,
let alone upcut buts), making the cut deeper.

David Lang

1 Like
26

I donā€™t think that this makes sense as all I did was one drilling action.

It was just Z zeroed.

27

Grim wrote:

I donā€™t think that this makes sense as all I did was one drilling action.

after a bad cut, does it fully retract? or when you return to Z=0 and then jog,
will you cut wood, thatā€™s the real test.

Iā€™ve had the bit drop on handheld routers as well as CNC routers.

David Lang

28

After the drilling I returned it to z 0 and that was the correct height.

Did you see anything wrong in my maslow.yaml?

Add youā€™ll see from my other post on chewed up belts, Iā€™m in maintenance mode now, so Iā€™ll remember this the next time Iā€™ve got everything working.

Thanks

29

Grim wrote:

After the drilling I returned it to z 0 and that was the correct height.

Did you see anything wrong in my maslow.yaml?

I did not, we need @bar to look at it.

Add youā€™ll see from my other post on chewed up belts, Iā€™m in maintenance mode now, so Iā€™ll remember this the next time Iā€™ve got everything working.

Ok.

David Lang

1 Like
30

still waiting for arrival of the package

31

The gcode is telling the machine to move down 3mm so it makes sense that the whole ends up being 3mm deep. To me this sounds like an issue on the CAM software side, I donā€™t think itā€™s an issue with the Maslow z-axis

1 Like
32

Hmm, Iā€™m not sure if I edited it and posted in the wrong gcode or if thatā€™s the value of the executed gcode.
Another one for the list of tests to do.

Thanks for reviewing it.

1 Like