On Monday 10 March 2008, [EMAIL PROTECTED] wrote: >Please, I did not in any way mean to be unfair to EMC. I did not mean it >in that way at all. > >EMC is a fantastic program. > >What I mean is that by doing the electronic gearing there is no way to >avoid a condition where a stepper motor is operating at a step rate where >resonance is present. It will happen and there is not anything EMC can do >to prevent it. Its just a condition of steppers that cannot be avoided. > >It's hard to read E-mail and not have the writing be taken in the wrong >way. Don't take my comments to be bashing EMC in any way. It has been >everything I have been looking for in CNC control. I have no issues with >EMC at all. It's a fantastic package and there has been a ton of work put >into it. > >Jim C
I may have been a bit defensive there, I agree that emc is at least as good as sliced bread and bottled beer, but not quite up to competing with instant sex yet as I'm only 73. :) I'm also not at all fam with how other software packages intended to drive steppers may or may not handle the "getting through the critical speed" problem. I suspect they make no attempt to work around it either. I have dampers on mine, all 4 axis's now, and they somewhat resemble the ones Jeff may have a pix of on the xylotex site, and they seem to work quite well, allowing me to get decent speeds (far faster than it can cut) on my micromill, but I pretty much limit it to something that keeps it well below those speeds while actually cutting even if its a tool up rapid. They are cobble jobs for sure, and don't even fit the shaft of the motor all that well so they wobble a bit, the 1/4" drill bit that mic's at 0.2477" I used apparently was drilling about a 0.265" hole by the time it got to the deep end of the through-hole. :( You can see mine at <http://gene.homelinux.net:85/gene/emc> along with the rest of the old farts messy machineing corner in my wood working shop. That *was* an HF MicroMill at one point in past history, not sure what it should be called now. The Z axis motor is a 425oz, and I can now exert 150 pounds of push on a drill bit, so I can actually drill decent sized holes in steel with gcode. The rest of the motors are 262oz motors. xylotex drivers. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) A black cat crossing your path signifies that the animal is going somewhere. -- Groucho Marx ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
