Messages

1

General Mach Discussion / Re: New Mach3 user looking for some help

« on: October 24, 2010, 12:03:23 AM »

Ah. Sorry about that then. I guess I could have found my answer by more diligent searching. Even so, I really appreciate the help and it made a big difference in my progress.

Richard

2

General Mach Discussion / Re: New Mach3 user looking for some help

« on: October 23, 2010, 10:09:39 PM »

Thanks a ton for the help. I switched to IJ incremental mode and this seems to have improved the problem. Not sure why it should be on incremental rather than absolute. At least it seems to do better in an air cut. I'll post an update once I see how it actually works when cutting the material.

Richard

3

General Mach Discussion / Re: New Mach3 user looking for some help

« on: October 23, 2010, 08:07:37 PM »

Yes. The DROs and the toolpath shows the strange motion. In addition, after I hit stop I can send the machine back to zero by selecting "go to zero" so things remain referenced properly.

Richard

4

General Mach Discussion / New Mach3 user looking for some help

« on: October 23, 2010, 06:50:50 PM »

Perhaps someone can point me in the right direction. I am a new Mach3 user. I have a 3 axes router from Camaster with a 48x48 table running Mach3. The router is new and I'm trying to cut my first part. I've created a curved part in Aspire and saved both pocket and profile toolpaths using the Mach3 PP for my machine. I've referenced x, y to the front left corner of the machine consistent with how I set things up in Aspire. I've also set the Z to an arbitrarily high height to perform an "air cut."

When I do this, the start of the G-code file runs correctly until it reaches a G3 command, at which point the gantry slows and wanders off until it hits the X limit switch. As far as I can tell, this makes no sense but I don't know jack at this point. It is, however, pretty frustrating.

Here's an example of the start of the G-code file for the profile (or cutout) toolpath using a .25 end mill:

( Cutout 2 )
( File created: Saturday, October 23, 2010 - 04:47 PM)
( for Stinger with Mach 3 from CAMaster CNC )
( Material Size)
( X= 43.000, Y= 43.000, Z= 0.750)
(Notes for Job: )
()
(Toolpaths used in this file
(Cutout 2)
(Tools used in this file: )
(1 = End Mill {0.25 inch})
N110G00G20G17G90G40G49G80
N120M03 G4 4
N130X0.0000Y0.0000F100.0
N140G00X1.5877Y1.9671Z0.2000
N150G1Z-0.1258F30.0
N160G1X3.8377F100.0
N170G3X3.9627Y2.0921I0.0000J0.1250 <- Here's the problem line
N180G1Y2.6858
N190G1X5.9627
N200G1Y2.0921

Works fine until line N170 when it does its wander off into infinity trick at slow speed. It does this, by the way, for three different files cutting radically different shapes from different start positions, etc. As far as I can interpret the code, this line:

"N170 G3 X3.9627 Y2.0921 I0.0000 J0.1250" simply tells the router to travel in a counterclockwise arc from its current position to X3.9627 Y2.0921 with no I offset and with a J offset of 0.1250. I don't see how this can possibly cause the router to drift off into oblivion at markedly slow feed rate and hit the limit switch.

Mach3 is set up the way it was shipped to me. I don't have the slightest idea how to troubleshoot this. This seems like pretty plain vanilla G-code that the router should be able to handle without problems. I am at a loss...

Can anyone get me on the right track?

Richard