dandrummerman21
Stainless
- Joined
- Feb 5, 2008
- Location
- MI, USA
Running a part that we have run before. 1/2" endmill, volumill programming about 4500rpm 200ipm, maybe .040" stepover. Gibbscam is programmed to leave .015" stock (I know increasing this is a possible solution, but read on)
The problem area in question is a rounded area about 1.5" diameter on the left side of the part. about 225 degrees of circle, with some other features on the right side. Imagine a circle shape with a 1" wide rectangle sticking out of it on the right
We previously ran this on a 1993 leadwell 760ap with 0m control. This job ran perfectly well on that. The volumill toolpath did not dig in anywhere, so the .015" stock was adequate to let the finish pass clean it up.
Now, that machine is gone, and replaced with a NEW (lol) 1999 Leadwell v40 with 21mb control. The problem is, the machine overcuts on a couple square corners slightly, and overcuts by a bunch around the big circle (I estimate .025, that is to say it cuts past the .015 stock by .010" or so). Same code, same tool.
Now, i CAN repost the code to leave .030 or so of stock, or maybe slow it down. Maybe find the "finish pass" of high speed milling and slow that down by a %. But I'd like this machine to behave while interpolating like the 0 controls do. We still have 4 0m machines of the era and I'd at least like the same code to work the same in this machine too. Even if I have to slow the machine down.
Offhand, I don't know what motors this machine has vs the other one, but I do know that the maximum feedrate was set to 197ipm on the old machine, while the newer v40 is 394ipm (394 rapids vs 787ipm rapids).
So are there parameters I could change to make it behave? I tried turning down 1422 and 1430 to 5000 (they were 10000) but that made no difference. I think if I slowed down further, they might cause the feedrate not to exceed those rates? I believe a setting of 5000 equates to 197ipm if I understood the book right. So if I set them to 4000 the machine wouldn't feed above 160? Still this doesn't "fix" the issue since the 0m machine had no problem going 200ipm around the circle without overcutting.
I also tried changing accell/decel parameters 1620 (was 100, tried 150) and 1622 (was 50, tried 75) but that didn't seem to have an effect.
The 21/210 operators manual mentions using G08, which this machine does not have (illegal g-code). I have an option parameter list for a 21 that does not show the option existing, and another list for 16/18/21 that does show it as existing, but the bit would not turn on, suggesting that G08 is a 16/18 option only. But why does the use of G08 show in the 21 manual? Would a 210 control have it but a 21 wouldn't? (I don't know what the difference between 21 and 210 is)
The problem area in question is a rounded area about 1.5" diameter on the left side of the part. about 225 degrees of circle, with some other features on the right side. Imagine a circle shape with a 1" wide rectangle sticking out of it on the right
We previously ran this on a 1993 leadwell 760ap with 0m control. This job ran perfectly well on that. The volumill toolpath did not dig in anywhere, so the .015" stock was adequate to let the finish pass clean it up.
Now, that machine is gone, and replaced with a NEW (lol) 1999 Leadwell v40 with 21mb control. The problem is, the machine overcuts on a couple square corners slightly, and overcuts by a bunch around the big circle (I estimate .025, that is to say it cuts past the .015 stock by .010" or so). Same code, same tool.
Now, i CAN repost the code to leave .030 or so of stock, or maybe slow it down. Maybe find the "finish pass" of high speed milling and slow that down by a %. But I'd like this machine to behave while interpolating like the 0 controls do. We still have 4 0m machines of the era and I'd at least like the same code to work the same in this machine too. Even if I have to slow the machine down.
Offhand, I don't know what motors this machine has vs the other one, but I do know that the maximum feedrate was set to 197ipm on the old machine, while the newer v40 is 394ipm (394 rapids vs 787ipm rapids).
So are there parameters I could change to make it behave? I tried turning down 1422 and 1430 to 5000 (they were 10000) but that made no difference. I think if I slowed down further, they might cause the feedrate not to exceed those rates? I believe a setting of 5000 equates to 197ipm if I understood the book right. So if I set them to 4000 the machine wouldn't feed above 160? Still this doesn't "fix" the issue since the 0m machine had no problem going 200ipm around the circle without overcutting.
I also tried changing accell/decel parameters 1620 (was 100, tried 150) and 1622 (was 50, tried 75) but that didn't seem to have an effect.
The 21/210 operators manual mentions using G08, which this machine does not have (illegal g-code). I have an option parameter list for a 21 that does not show the option existing, and another list for 16/18/21 that does show it as existing, but the bit would not turn on, suggesting that G08 is a 16/18 option only. But why does the use of G08 show in the 21 manual? Would a 210 control have it but a 21 wouldn't? (I don't know what the difference between 21 and 210 is)