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Strange Z behavior

 

Hi Everyone,

 

Wishing you full tables, joy, and no difficult relatives tomorrow.

 

I’m having a problem with my Z axis in Mach 3. I open Mach 3 , set my X, Y, and Z., load in my .NC file, and press start. I’m cutting a part out of 70# density tooling board. It cuts like butter on my mill. My stick out on a .250 3Flt FEM is just over 3 inches. When I press start, everything looks normal. Except the Z.

 

I’ve zeroed the Z to the top of my part, which is 2.520”. At this point, my scale shows that I have milled just over an inch. The reading on Mach shows: 2.24”. It seems that for every .250: on Mach is really about an inch off of the part’s Z.

 

I have shut down the system and waited a couple of minutes before starting the computer and mill. Then rinse, wash, repeat.

 

Does anyone have any experience with this and what did you do to fix it?

 

Thanks,

 

Terry Wellman

 

Is there a tool length off set in your tool table? You could be setting your z zerowith the tool length off and when you run the g code it gets switched on. 
 
Calum
 

On 23/11/2023 03:37 NZDT SCMWCAD1 <scmwcad1@...> wrote:
 
 

Hi Everyone,

 

Wishing you full tables, joy, and no difficult relatives tomorrow.

 

I’m having a problem with my Z axis in Mach 3. I open Mach 3 , set my X, Y, and Z., load in my .NC file, and press start. I’m cutting a part out of 70# density tooling board. It cuts like butter on my mill. My stick out on a .250 3Flt FEM is just over 3 inches. When I press start, everything looks normal. Except the Z.

 

I’ve zeroed the Z to the top of my part, which is 2.520”. At this point, my scale shows that I have milled just over an inch. The reading on Mach shows: 2.24”. It seems that for every .250: on Mach is really about an inch off of the part’s Z.

 

I have shut down the system and waited a couple of minutes before starting the computer and mill. Then rinse, wash, repeat.

 

Does anyone have any experience with this and what did you do to fix it?

 

Thanks,

 

Terry Wellman
 

You could also be binding on the z-axis. Try removing stepper motor power and see if you can manually turn the motor shaft.

 

First thing to do is run above material with the spindle turned off. If it doesn't do it, then you have a noisy spindle.

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