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411  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Arcs not cutting smoothly on: February 16, 2012, 04:36:20 AM
In any case, this doesn't change anything about the segmented arcs I'm getting on this part. I tried exact stop this afternoon, and it didn't make a difference. Still getting the same behavior.   Huh

I think the answer lies right there, in the numbers of your test. X axis is pretty much obvious, heaving an absolute deviation of 0.002", which is enough for those segments to be seen. I would guess that if you did the test over a longer distance you would see a distinct repetitive nature of the numbers. Entering the numbers in Excel would make it easier to visualize.

Since you're not using a belt drive, you have to start looking elsewhere in the driver mechanism. For instance, what is the motor? Could be a stepper motor with poor accuracy - unevenly spaced poles or magnets on the rotor. Since your Y axis is much better than the X, you could try swapping the motors.

Dan
412  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Arcs not cutting smoothly on: February 15, 2012, 11:42:27 AM
Sorry I missed this:

The length of the flats are .160" on the outside of the large diameter (0.75") and 0.120" on the outside of the smaller diameter. They're also not flat, now that I take a close look. They're definitely arcs in and of themselves.

Outside of the backlash, the axes are very consistent - example: I make a g0 move from x0 to x-3.7500, then from x-3.7500 to x-3.5000. I now zero the glass DRO, and I can make any move in the positive direction and be pretty much dead on (within a couple of ten thousandths, anyway).

Can you extend this test. Zero Mach3 and glass scales (after taking out any backlash) and then do short moves of 0.01" up to a total of about 0.15" and compare the numbers in Mach3 and the glass scale at each point and see if they correlate. Repeat on both axes.

Dan
413  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Arcs not cutting smoothly on: February 15, 2012, 11:09:43 AM
Is the arc segmented all around? And segments are absolutely equal in length (both on same arc and different radius arcs)? Can't be seen on the photo.

Mach3 sometimes does do strange things. Have you tried restarting the PC?

Have you successfully cut arcs before?

Dan
414  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Arcs not cutting smoothly on: February 15, 2012, 10:30:18 AM
Doesn't look like backlash to me. I would, however, guess that it is a mechanical problem in one (or both) of the axes. If you have belt transmission, for instance, a run-out of the pulley could cause something like this.

To make troubleshooting easier you could hold a pencil in the spindle and draw the tool path on a paper.

By the way, the transition points you specified in the above drawing are not all correct. The 2 diagonal lines should be removed as there is no direction change in either axis.

Dan
415  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 08, 2012, 03:15:22 AM
This leopard looks so much more better than the first one. Nice, Greg!

Dan
416  Mach Discussion / General Mach Discussion / Re: Laser cutting on: February 07, 2012, 03:02:30 PM
Definitely against the rules! Grin

By the way, not sure Tweakie is the address either. He only can cut plastics and woods with his setup. There are many plasma users here though, so may be better asking them to do the job. Not many metal cutting lasers here (if any).

Dan
417  G-Code, CAD, and CAM / LazyCam (Beta) / Re: LazyCAM Plasma Different Feed per Layer - Is it Possible? on: February 07, 2012, 03:58:34 AM
Thanks, Rich. Looks like there is no provision for this in Plasma mode Sad

Dan
418  G-Code, CAD, and CAM / LazyCam (Beta) / LazyCAM Plasma Different Feed per Layer - Is it Possible? on: February 06, 2012, 10:52:09 AM
Hi,

It does work in Mill mode, but doesn't seem to in Plasma. Is there a way to do this in Plasma?

Thanks,
Dan
419  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Just got a lathe to retrofit on: February 06, 2012, 06:16:43 AM
Yep, Hood, it's only a good thing or at least as long as you won't have to reduce acceleration.

Dan
420  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 06, 2012, 04:15:39 AM
If you had Input #1 controlling something else which you wouldn't expect to get triggered while using the plugin it could get not pleasant.

Dan
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