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General Mach Discussion / Re: New CV features
« on: December 07, 2006, 01:14:05 AM »
Ok, sorry it's taken awhile to get back to this, it's that time of year again. 
I'm not real sure if it's better, I've been running some different parts lately and it's harder to tell with these. One thing that I have noticed is that with a CV Distance Tolerance setting of say 0.10 and a feed of 100, a toolpath may execute fine, but as you take the speed up a bit, it will start to hesitate between segments again. If you turn on stop on angle, then it will always hesitate no matter what the setting for the angle. Take for example the right angle talked about earlier and add a "S" shaped path going back to X0Y0 with a couple of line segments at the beginning, middle, and end (Attached sample file). The return path in the file really needs little or no speed adjustment, depending on how fast you're going. If I ran this with CV on and no distance check, it runs fine. With CV and a distance check of 0.12 at 120IPM, it runs ok. Start raising the feed and it starts to hesitate between each line and arc segment on its way back to X0Y0. Throw in a angle check of 89 and it stops CV at the right angle, but also still at each line and arc segment. If CV distance is unchecked and angle is checked, it doesn't matter what you put in for a value (89 -270), it will hesitate again at each line and arc segment.
What I'd like to be able to set for the many varied size and shape pockets that I make for law enforcement badges and guns, is to be able to set a distance tolerance of 0 (exact path), a low accel (no banging in and out of corners) and still have smooth non-hesitant motion between the sections of code (G01 to G02 or G03). Many times I have to have a rectangular pocket within the main pocket and they were intended to have a radius the same as the cutter to allow for clearance for some part to drop into. These are getting cut (with a low distance check) with a larger radius on one side of the end of the rectangle (due to rounding) and a close to normal radius on the other side, making what I can best explain without actually drawing it, a radiused trapezoid rectangle.
On another note, correct me if I'm wrong cuz this may just be my dyslexic mind
, but on the "General Logic" page where it says "Stop CV On Angles <", doesn't that mean less than? So If we have an angle of 90 degrees and a setting of 89, it shouldn't stop, but if it's set at 91, it should.
I'm not real sure if it's better, I've been running some different parts lately and it's harder to tell with these. One thing that I have noticed is that with a CV Distance Tolerance setting of say 0.10 and a feed of 100, a toolpath may execute fine, but as you take the speed up a bit, it will start to hesitate between segments again. If you turn on stop on angle, then it will always hesitate no matter what the setting for the angle. Take for example the right angle talked about earlier and add a "S" shaped path going back to X0Y0 with a couple of line segments at the beginning, middle, and end (Attached sample file). The return path in the file really needs little or no speed adjustment, depending on how fast you're going. If I ran this with CV on and no distance check, it runs fine. With CV and a distance check of 0.12 at 120IPM, it runs ok. Start raising the feed and it starts to hesitate between each line and arc segment on its way back to X0Y0. Throw in a angle check of 89 and it stops CV at the right angle, but also still at each line and arc segment. If CV distance is unchecked and angle is checked, it doesn't matter what you put in for a value (89 -270), it will hesitate again at each line and arc segment.
What I'd like to be able to set for the many varied size and shape pockets that I make for law enforcement badges and guns, is to be able to set a distance tolerance of 0 (exact path), a low accel (no banging in and out of corners) and still have smooth non-hesitant motion between the sections of code (G01 to G02 or G03). Many times I have to have a rectangular pocket within the main pocket and they were intended to have a radius the same as the cutter to allow for clearance for some part to drop into. These are getting cut (with a low distance check) with a larger radius on one side of the end of the rectangle (due to rounding) and a close to normal radius on the other side, making what I can best explain without actually drawing it, a radiused trapezoid rectangle.
On another note, correct me if I'm wrong cuz this may just be my dyslexic mind
, but on the "General Logic" page where it says "Stop CV On Angles <", doesn't that mean less than? So If we have an angle of 90 degrees and a setting of 89, it shouldn't stop, but if it's set at 91, it should.
Wow, thanks Art! Coming from the master coder, that's a treasured complement. 
