On Thursday 13 September 2018 03:23:23 Gregg Eshelman via Emc-users wrote:
> Or you could just find a straight spindle so you can get to machining > with the machine instead of spending time machining to try and fix the > machine. ;) > Rotsa ruck with that, Gregg. I expect a new, straight spindle would have to be made, at a cost exceeding what I have in it now, aka several thousand $. I have effected a restoration of the bore, and tuned up the backing plates already so both chucks run pretty true now. My time is the least cost as long as I'm still sucking air, so once I calibrated the bed wear and setup compensation, I will repeat the jig making as I have another piece of alu the same as I started out with, or try to fix this one, and regrind the 5C adapter to true. Done properly the adapter will sit a few thou deeper in the spindle, it seems to be bottoming in the spindle at the small end of the MT-5, and lose 1/16 off its back face flange. I made it originally to clear the end of the spindle by only enough to drive a knife in to help eject it if the slide hammer won't, but it has so far. But fixing it means it will sit a few thou deeper in the spindle requireing a few thou off the back of the flange. It would have been a heck of a lot simpler if the ER-40 had been made as an MT5 rear end with a 5C drawbar thread. The 5C, with its extremely size critical and cylindrical butt end is IMO a first class screwup, should never have become a std fitting in any machine shop. It is however, nice to have the pass-thru for up to 1" rod. I've run the MT-5 taper with a .0001 dial, and its running true even if the taper is wrong, so Im not going to regrind that again, I'll just make the 5C fit it by reducing the small end until it sits solid, That will be about 2 thou polished off the small end. The problem there is having a jig w/o run-out which I obviously do not have now. so the jig to hold the 5C adapter true I don't have now, and won't attempt to make true until the bed wear has been compensated for and I get the taper I program. I didn't sign up for this headache, but thats the breaks. Thanks Gregg. [...] -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
