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General Mach Discussion / Newbie with inaccurate machine looking for tips
« on: April 14, 2013, 09:08:07 PM »
Hello, my name is Chris and I am quite new to CNC. I have no CNC background at all and am having some issues with our machine and hoping to find some help here. i have had a machine for around 4 years and used it very little for the first few. It is a Vortech with 5x10 bed with stepper motors and at the time I didnt realize it is lkely a piece of junk, but I am getting ambitious about figuring this thing out. We have been using it regularly the past 6 months but it isnt very accurate and would like to try and dial things in if possible.
First main issue: If cutting a rectangular part, it turns out to be out of square. For instance, I just cut out a part that is 29x15 with a bunch of 1/2" holes in it. It comes out at 29x 15 1/16 and is 1/16 out of square. I tried tuning the motors to get them as accurate as possible already but am not fimiliar with all the different aspects.
Second issue is if I set my bit to zero on the corner of the material and run a program, instead of returning exactly to the zero point, it always comes back and sets the bit just short of 1/8" forward in the Y.
I am wondering if this is just a function of a poor machine or something I can adjust to compensate? I have poured over the forums trying to search out the answer and while I am sure it is there somewhere, I havent pinned it down yet.
Any help would be highly appreciated.
Anybody from this neck of the woods (west central Minnesota)willing to do some side work showing us the basics of Mach?
Chris
Starbuck, MN
First main issue: If cutting a rectangular part, it turns out to be out of square. For instance, I just cut out a part that is 29x15 with a bunch of 1/2" holes in it. It comes out at 29x 15 1/16 and is 1/16 out of square. I tried tuning the motors to get them as accurate as possible already but am not fimiliar with all the different aspects.
Second issue is if I set my bit to zero on the corner of the material and run a program, instead of returning exactly to the zero point, it always comes back and sets the bit just short of 1/8" forward in the Y.
I am wondering if this is just a function of a poor machine or something I can adjust to compensate? I have poured over the forums trying to search out the answer and while I am sure it is there somewhere, I havent pinned it down yet.
Any help would be highly appreciated.
Anybody from this neck of the woods (west central Minnesota)willing to do some side work showing us the basics of Mach?
Chris
Starbuck, MN