Messages

1

General Mach Discussion / Re: Thermal Height Control (THC) bouncing problem. CNC Plasma

« on: June 07, 2012, 12:24:05 PM »

The plasma is a miller spectrum 875 auto line.  The only thing I saw in the manual is not to use more then 120 or 130 psi.  I'm gonna look at it again.

2

General Mach Discussion / Re: Thermal Height Control (THC) bouncing problem. CNC Plasma

« on: June 07, 2012, 09:54:11 AM »

Tripleblack, Thank you so much.  That fixed my problem.  Well It will cut good using a 40 amp tip on plates 1/16" through 1/4" and using a 60 amp tip for sizes greater than 1/4".  If I cut 1/4" with a 60 amp tip it still cuts bad.  I'm fine using the different tips though.  I set my THC feed to 5.  Thanks for the help everyone.

3

General Mach Discussion / Re: Thermal Height Control (THC) bouncing problem. CNC Plasma

« on: June 05, 2012, 02:55:36 PM »

Please see attached images of my system.  I'm new to Mach plasma.  I'm more familiar with mach mill.  I hope these pics answer your questions.

4

General Mach Discussion / Re: Thermal Height Control (THC) bouncing problem. CNC Plasma

« on: June 04, 2012, 12:19:05 PM »

Thanks for your reply BR549 but I have tried that.

My system is in inches.  My velocity was over 90 and I tried backing it down a couple times and even brough it down to 10.  The problem still occured.  I've adjusted the acceleration as well. watching the z, I can see the motor turning left and right constantly during the cut. 

I've been trying to get ahold of plasma route for a week straight and they will not answer or return my phone calls. 

5

General Mach Discussion / Thermal Height Control (THC) bouncing problem. CNC Plasma

« on: June 01, 2012, 02:53:08 PM »

I have a Plasma Route CNC plasma cutting table with 3 axis stepper motor set up.  It is running mach and has a thermal height control (THC) that the company provided.  The THC has a "brain" that senses off the plasma cutter and sends information to Mach 3.

My Problem:
I can cut with no problem when The THC is turned off.  The cut is very smooth and almost straight up and down.  When I turn the THC on the Z axis jumps up and down continuously during cutting which produces a terrible cut (jagged and tapered). 

Question:
How can I adjust the THC so that it cuts smooth like it does without it on.  I have to Use the THC because all the plates I get are always bowed. 

I'm in a pinch and need this quick, Please help.