Originally Posted by tof1  Something I was also wondering is my Z axis tops out at 80IPM how it's set up right now. Would the Z axis not being able to move quickly enough or something to do with a setting on the DTHC have anything to do with the rough edge?? |
As long as you not getting head "bounce" (visible up and down) then the jaggies are not coming from the Z motion. There are settings in the DTHC that allow you to fine tune the gap voltage (defaulted to 1 volt "span") and the "Tip Saver" (anti-dive) Percentage in the cut profiles. The max response of the DTHC is set by the total loop speed which includes the Z axis speed. You have to normally run the Z at reduced velocity during DTHC operation because there are no accleration curves applied. So if you start with 80 IPM you may be limited to 24 IPM in THC mode. The faster you can move the Z (and still keep resolution reasonable) the better your DTHC will perform. That being said, on flat cuts the 80 IPM is probably not the cause of the ragged edges. The rounded edges are from poor acceleration in the mechanics. The control software will compensate for the inability to accelerate by rounding the corners. While you can loop the corners that won't help you when you are trying to cut detailed cuts with sharp angles you don't have scrap areas to cut on.
I have to agree that the problem looks a look like uneven motion. With MACH , which has constant velocity, and with 4 node circles motion should be smooth as butter. What is your final drive mechanics like? If it's stepper do you have belt reduction? Direct drives to pinon will run with poor acceleration and reduced resolution. Check everything for backlash.
Get the workclamp onto the workpiece and grind off a spot for the clamp to get through the rust. Make sure you air supply is dry.
Heed what Jim says. That 1000 will cut nicely if you pair up the right nozzle with the right current setting and the proper feedrate. I really like the cut quality I get with a 40A tip on material up to about 1/4 ".
Contact me on the CandCNCSupport Forum and I can give you some settings for the Cut Profile for the DTHC to check.
TOM Caudle
www.CandCNC.com