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Author Topic: Profile toolpath problem  (Read 4618 times)

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Offline AJF

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Profile toolpath problem
« on: June 20, 2009, 11:14:45 AM »
I’m having a problem cutting a profile cut. I’ve created a simple rectangle with rounded corners that I want to cut with a V-bit. Everything looks fine when I preview it in Aspire. But when I run the cutting file on my machine; a ¼” before the end of the cut the spindle rises and leaves the cut unfinished. I thought initially that the ramping feature might be turned on but it is not. All other cutting seems to be working correctly except profile cuts.
I recently installed Mach 3 and I’m not sure if that might be the cause as I’m not yet fully familiar with all the settings in this program. Does anyone have any ideas that could help me. Which puzzles me the most is if I run this file on my old Mach 2 machine it runs fine completing the cut. Attached is the code generated by Aspire which I can't seem to find any problems with.

( Border-1 )
( Mach2/3 Postprocessor )
N20G00G20G17G90G40G49G80
N30G70
N40T1M06
N50G00G43Z0.7874H1
N60S25000M03
N70G94
N80X0.0000Y0.0000F60.0
N90G00X0.5000Y0.7500Z0.2362
N100G1Z-0.1000F20.0
N110G3X0.7500Y0.5000I0.2500J0.0000F60.0
N120G1X11.2500
N130G3X11.5000Y0.7500I0.0000J0.2500
N140G1Y9.2500
N150G3X11.2500Y9.5000I-0.2500J0.0000
N160G1X0.7500
N170G3X0.5000Y9.2500I0.0000J-0.2500
N180G1Y0.7500
N190G00Z0.2362
N200G00Z0.7874
N210G00X0.0000Y0.0000
N220M09
N230M30
%

Offline Hood

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Re: Profile toolpath problem
« Reply #1 on: June 20, 2009, 12:14:12 PM »
It is working fine here, its starting cutting at x0.5y0.75 and going right round and back to that position before rising again then finally going to X0Y0.

Can you attach your xml and I will see if I can find a problem with it.
Hood

Offline AJF

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Re: Profile toolpath problem
« Reply #2 on: June 20, 2009, 01:01:40 PM »
I'm not that familiar with the XML and as there are several listed, I'm not sure which one you might be referring to.

Offline Hood

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Re: Profile toolpath problem
« Reply #3 on: June 20, 2009, 01:09:38 PM »
Ok the one you want is the one for the profile you are using. So for example if you are using the standard Mach3Mill profile then it is the Mach3Mill.xml that you want to attach. You will find it in the main Mach3 folder, C:\Mach3 if you have installed to the default loactaion.
You will need to copy the xml to another loacation on your drive and rename for the forum to accept as an attachment, suggest you rename it to AJF.xml.
Hood

Offline AJF

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Re: Profile toolpath problem
« Reply #4 on: June 20, 2009, 01:25:24 PM »
I've attached 2 files as they both appeared to be modified about the same time.

Offline AJF

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Re: Profile toolpath problem
« Reply #5 on: June 20, 2009, 02:52:34 PM »
I had been running Mach 2 for several years with no problems on my existing machine. I decided to upgrade to Mach 3 when I started using Aspire to learn more about 3d cutting. It wasn't till recently when I had to do some simple  2d cutting that I noticed this problem. It is actually more of a problem than I thought, if you look at the attached file were I tried cutting a series of squares with square corners, and radius corners then a circle and ellipse. You will notice that they all are distorted at the corners and incomplete, however the overall size of each is correct.

Offline Hood

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Re: Profile toolpath problem
« Reply #6 on: June 20, 2009, 02:56:21 PM »
Just looking at your xml at the moment, I have noticed that you have Input 1 set to Port 1 Pin 1, that is not correct as pin 1 is an OutPut. Its not likely your problem but that may depend on what you are using OutPut 1 as you have it set up to the same port and pin. I will continue looking at the xml and see if I can find the problem.
 The corners however are likely to be backlash so check everything is tight such as pulleys on motors and screws etc.
Hood

Offline Hood

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Re: Profile toolpath problem
« Reply #7 on: June 20, 2009, 03:03:20 PM »
Ok, found your problem, go to config menu then General Config and set the lookahead to 2 and you should be fine. This should be fixed in the next revision of Mach but setting to 2 should work for the time being.
Hood

Offline AJF

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Re: Profile toolpath problem
« Reply #8 on: June 20, 2009, 04:27:39 PM »
I changed the lookahead and tried cutting the same files as in the picture but it made no difference. I also checked for backlash but everything is tight.
By the way thanks for your efforts I appreciate.

Offline Hood

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Re: Profile toolpath problem
« Reply #9 on: June 20, 2009, 04:30:21 PM »
Does it cure the lift up at the last part or is that still happening with the lookahead at 2?
Hood