I'll try that. The thing that confuses me is that the parts are coming out right except for on one end of the part. Everything else seems to come out just fine. It's hard to explain and might be a good idea for me to take some pictures of the parts and post them on the web so others can see what it is that I'm doing a bad job of explaining.
Chris http://www.blowyourbrassoff.com http://www.builderofstuff.com http://www.myspace.com/builderofstuff http://www.myspace.com/builderofbluesharps Just a man, his shop, and a long list of unfinished projects... ----- Original Message ---- > From: Luc Claeys <[email protected]> > To: Enhanced Machine Controller (EMC) <[email protected]> > Sent: Sunday, July 26, 2009 11:56:51 AM > Subject: Re: [Emc-users] new to group > > Hi Chris, > > Chris Reynolds wrote: > > I'm new to the group and I could use some help with a problem that I'm > > having. > I just built a new cnc machine and I keep running into a problem that I can't > figure out. I've been doing some test cuts, > > problem is they always come up short on one end. I thought it was a > > backlash problem so I put the dial indicator on the machine and ran it to > > an > inch. It came up like .040" short. So I > > tried adding a backlash command to the ini file and that didn't fix it, > > so it wasn't a backlash problem. Then I tried messing with the steps > > and finally got it to come out right. Run it to an inch, dead on 0, run it > back to 0 and end up dead on 0 again. So then I run the > > program again and the whole thing is now to long. It always seems to > > come up short on one end. Checking the math the steps are right, I have a > > 20 > tooth pulley on the motor and a 40 tooth pulley on the leadscrew, running in > full step mode, so that comes out to 1600 steps per inch, which is what I > have > in the program. It's almost like it's a compounded problem, like it's off a > small amount but then when you cut through the whole part it adds up. But the > weird thing is that it's off on one end. The part I'm cutting resembels a > comb, > where you have slots cut into the part every so often, there's a wider > section > at each end, on the far end it's right, on the 0,0 end of the part that wider > section is to short. > > I think that you are loosing steps. It may be that the MAX_VELOCITY or > MAX_ACCELERATION settings for the axis [AXIS_0] ... [AXIS_2] in your > .ini file are too large. > You could test with very low values to check if that is the problem. > > Luc > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
