On Tuesday 28 March 2017 10:06:12 John Kasunich wrote: > I can't see how lathe alignment could affect your angle. If you > turned the OD running forwards with the cutting tool in front and > bored the ID running in reverse with the cutting tool in back, then > yes. But if both were done with the spindle going forward then the > tip of the cutting tool is in exactly the same place and should be > moving at exactly the same angle. > > I must say that if I was doing this I probably would program both the > ID and OD tapers _exactly_ the same, even if that means one of them is > longer than necessary and wastes a bit of time cutting air. When you > change the Z length you leave room for errors to creep in. > > I suspect that delta-x divided by delta-z is not the same in your ID > program vs. your OD program.
For OD: delta x=0.0993758989161300168, delta z=0.735" the delta x is TAN[7.7]*0.735 For ID: delta x=0.135205304647795941, delta z=1.0000" The delta x is TAN[7.7] looks correct, is it not? I need to go to the USPO & send a box of childrens books to a grand niece with a house full of toddlers. Its called Honeydoo's. > On Tue, Mar 28, 2017, at 09:54 AM, Gene Heskett wrote: > > On Monday 27 March 2017 03:56:53 Gene Heskett wrote: > > > On Monday 27 March 2017 00:17:19 Erik Christiansen wrote: > > > > On 26.03.17 18:53, Gene Heskett wrote: > > > > > But is 7 the correct factor? It should be fairly easy to jack > > > > > it back out. > > > > > > > > Gene, I've never made one of them, but looking here: > > > > > > > > http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd= > > > >8&ve d= > > > > 0ahUKEwiE6q-q5PXSAhWGKWMKHeZIAf0QFgg-MAc&url=http%3A%2F%2Funiver > > > >salb ear > > > > ings.com.au%2Fdownload-subproducts%2Ftaperlock-bushes&usg=AFQjCN > > > >GOFI vAU jPQ1JccxaHkdEjC0hT5oA > > > > > > > > the first bush in the table seems to be: > > > > > > > > atan((35.2 - 33.7)/11.1) = 7.7° included, near as dammit. > > > > So I did the taper turn at TAN[7.7]*total z len which was 0.735" > > > > Finished (except for jacking holes) hub looks great. Set it aside > > for now. > > > > Chuck pulley and hammer around for concentricity etc, spins good and > > true. Edit code to do the tapered bore, but change for a full inch > > of Z motion, so I used the TAN[7.7] raw as the inner factor to sub > > from the bore at z left end. Using one of those cheap $20 a kit of > > cemented carbide boring bars. Re-shapened with a diamond disk in a > > dremel. Get it bored big enough (and bore looks like shit, tool is > > skipping) to start checking fit using the hub I just made at what > > was supposed to be the same angle. Bored angle too steep by quite a > > bit. Hub goes in about half way, jams on tip of hub and can be > > rocked around. Its not trashed yet, but this is where I start > > fiddling with bar sharpening angles, widening the hole at the deep > > end until it fits. And changing the bar to a monster I made years > > ago, a 5/8" diameter bar about 10" long I had made a groove in the > > side of to hold a small bar that seriously needed some stiffening. > > Takes std diamond pattern chips. Then gradually reduce the x > > decrement until it fits. > > > > I don't believe the spindle head on this lathe has ever aligned with > > the z motion of the carriage. I replaced the whole head a year ago > > after refitting a new head with all metal gears, and while I cleaned > > the paint overspray off the mating surfaces on its bottom, I think > > this one is sitting even more out of alignment. At one time years > > ago I had wasted a piece of cold roll and a few days adding an > > offset per inch factor to x until it was turning a decent cylinder, > > and should have painted it on the monitor, as its in the area of 7 > > thou per inch, but that was on the OEM head assembly. Cheap, mumble > > mumble, Chinese crap. > > > > Andway, change the bar to the big boy, then start shaving the angle > > is todays project. After I go to the store and get stuff for > > breakfast and fix it for us. > > > > > Cheers, Gene Heskett > > > > 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> > > > > -------------------------------------------------------------------- > >---------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
