To match holes that good they are going to buy ground thread and shaft bolts. Hah!
I pretty much plan on bolts being 0.003 undersize, sometimes I get fooled. Nice job on the machine. Dave On Tue, 2010-09-28 at 21:53 -0500, Stuart Stevenson wrote: > Gentlemen, > I am a happy camper. > Jeremy came in my office with a quiet voice to give me a report on how the > Cinci cut the big plate with all the holes with a +-.002 location tolerance. > I thought OH NO we have problems. He then smiled and said it nailed all the > holes. There was one dimension out of tolerance. A hole to hole location of > +-.001 on a distance of between 25 and 26 inches. It was -.0015 or .0005 out > of tolerance. This is in the realm of temperature causing the tolerance > fluctuation. I think maybe the design is a little tight toleranced as quite > a number of the holes are bolt holes. Bolt holes with a +-.002 location > tolerance are a little overdone. Jeremy said he thought this is the only > machine in the shop that could do these parts. What an endorsement of EMC2. > I heard someone say you cannot make a silk purse from a sow's ear but I am > not so sure anymore. > The Enshu is basically done. It is ready to make parts. This afternoon I > was looking at how to get an encoder on the spindle. After removing the > spindle cover and finding it would be a major undertaking to mount and > connect an encoder we started looking at the spindle drive. The spindle > drive is a full servo with feedback from the spindle motor. Instead of > encoder feedback it has resolver feedback. This feeds directly into the > spindle drive. Reading the manual lead us to check a few pins with a scope. > We found encoder A and B pulses on two pins and an index pulse on another > pin. This will allow feedback into EMC and give me control of the spindle as > an axis. I will be able to drive the spindle as an axis with the MPG. > I am not sure exactly how I want to control this. > I will be able to read the index pulse after every gear change to orient the > encoder to the spindle. > Do I want to have a linear scale or a rotary scale? > This has 4000 rpm and I am not sure how many pulses/rev this will have. > Ideas, comments welcome. > I have the video camera ready to record some motion/cutting and tool > changes. > > EMC2 rocks!!!! > thank you very much > Stuart > ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
