On Monday 11 February 2008, Dave Engvall wrote: >Spindle load is certainly one way to do it. Whether you do spindle >load or force your cam is going to have to >do a good job of keeping the cutter load constant or you will end up >setting the trip too high to do much good. >The same is true in trying to control such things by setting >following error rather tightly. > >Dave > Running steppers here, so there is no feedback from that. And it could have been useful yesterday as I was cutting the crush slot in a boring bar holder, the cut involved going about 1.25" deep from open end to open end with a std 1/4" end mill that had been sharpened till there was only about 5/8" of flutes left. A particle of swarf apparently got jammed between the shank and the slot wall, stopping my 4 ipm x motion. Backing away by hand allowed it to clear, but then I had to rezero the x axis, edit my routine for the then current depth of cut to restart it at, and it continued till it was done with no further issues. I was cutting about 10 thou deeper per pass each way, at around 500 rpm. Trying to keep the chips big enough to not constitute a nanoparticle hazard. Or in my hands, virtually invisible but painful as hell. Lubed by a couple of drops of cutting oil per pass. Too cold to plug in the air compressor since I'd have to leave the door open, its outside under the roof overhang, with a tarp over it ATM.
I need a shop about 4x bigger. Don't we all? But using the finished boring bar, I've found about 75% of the motor mount I just knew was hiding in a 3.2x3.2x4" block of alu. I should have put a fresh chip in it though, it sings to me & leaves a stippled finish. Now I have to turn it around in the 4 jaw, relocate it and do the other ends last 3/8", drill the motor mount and flange holes & mill away the sides to clear the mill table when the rotary is mounted to it. Then switch the 3 axis card for a 4 axis, pull the 262 oz/in z motor from the mill and replace it with a 430 & use the 262 on the rotary table. And plug in another parport card I've bought so I can use the 3 axis card on the lathe eventually, which would have made that boring job a heck of a lot more precise. And, I obviously need to cut an allen wrench down for a very short short leg so I can reach the carriage adjustment capscrews which are only about 3/8" above the lead screw, I could see it bouncing a bit last night after I'd pulled it down hard enough I had a heck of a time restarting the carriage onto the ways. Way wear in the middle I 'spose, there's a lot of time on that little 7x12, I've refinished the bottom of the carriage once already. The factory way fit was atrocious, wrong V angle by a couple of degrees so the wear was very high initially. Subject to being replaced with a bigger lathe IF I can get my sugar under control, we're still working on that. Then I can start playing with 4 axis's on the mill. 8:) There are a lot of things I have left to do, hopefully I have the time left before I fall over. 73 and diabetic, so who knows... But I AM having fun, thanks to you guys, all of you! -- 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) Some of my readers ask me what a "Serial Port" is. The answer is: I don't know. Is it some kind of wine you have with breakfast? ------------------------------------------------------------------------- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
