what is your thc Speed Setting?

don't be surprised about my Setting, i am in metric

Ok, thats possible - try making up some simple code to rapid (G0) the Z axis from Z0 to Z2 (or whatever travel you have, run it maybe 10 times starting from Z0 at a known position and at the end go to Z0 - is the axis in exactly the same position it was at the start???

If you are losing steps it could well be this, plus, when running THC you need to know that the normal acceleration curve is not used, THC moves on Z are more like BANG-BANG-BANG really fast moves are needed here or by the time the Z has moved the torch is elsewhere

I think there its a setting called THC-Rate - its a % of speed, try going low and working up, however i cant remember if this is a generic Mach3 setting or one specific to my screen set/THC system.

Test for lost steps first


EDIT

just saw TPS' reply - thats the box i mentioned.

what is your thc Speed Setting?

don't be surprised about my Setting, i am in metric

15

Ok, thats possible - try making up some simple code to rapid (G0) the Z axis from Z0 to Z2 (or whatever travel you have, run it maybe 10 times starting from Z0 at a known position and at the end go to Z0 - is the axis in exactly the same position it was at the start???

If you are losing steps it could well be this, plus, when running THC you need to know that the normal acceleration curve is not used, THC moves on Z are more like BANG-BANG-BANG really fast moves are needed here or by the time the Z has moved the torch is elsewhere

I think there its a setting called THC-Rate - its a % of speed, try going low and working up, however i cant remember if this is a generic Mach3 setting or one specific to my screen set/THC system.

Test for lost steps first


EDIT

just saw TPS' reply - thats the box i mentioned.

I ran a code

G0 z1
G0 z0
G0 z 1.5
G0 z0
G0 z 1.3
G0 z0


Ect.. maybe 25 times over and over. Z Axis landed in same position every time.

I will mess with my setting on Z axis tuning,

Thanks

if you have still your buttons connected to THC up/dn you can also Play a Little bit with the THC speed

Yes as TPS says above, set your Z zero at a known position, then using the buttons move the Z up and down really violently, sharp changes are what is needed, up-down-up-down then go back to Z0 and see if it returned to where you set it.

If not then lower the THC speed a bit and try again.

Okay, so I’m at This point trying to get my Z axis to travel at its maximum speed before it makes an error?

Well, really we are trying to find out if THC moves (which are different to normal moves) are causing your Z axis to lose steps.

Maximum speed is not relevant yet, just trying to fix your odd Z issues.

Ever since I adjusted my Z axis motor to run at 15:15, it’s running perfect. I’ve been cutting some 1/4” , 14GA, and 10GA mild steel and it’s awsosme

Sounds good, if it works, go with it