On Thursday 01 September 2016 05:33:58 Andy Pugh wrote: > > On 1 Sep 2016, at 01:13, Gene Heskett <[email protected]> wrote: > > > > Assumeing I have the tapered thread I want, can I continue that > > thread without the taper if I don't change the Z resting point while > > its > > You could use G33 again rather than G76 to be completely sure.
I finally made the g76 work. I found the drawing in the doc pdf is incomplete, no mention of "j" and what it does. So I worked it out for a test cut last night, very late. If it works, fine, but I'll likely start over with another piece of A2 as I accidentally bored the screws's seating hole too big, so this one is a practice piece anyway. ATM I haven't a clue if I'll have to work on the saddle to get clearance internally. And that will be a major PITA as I'll have to build a fly cutter that is piloted by the old crossfeed handle carrier that now has torrington bearings in it, both for the expected thrust, and for the belt tension involved from the motor to it. There is a recess in the saddle, beyond the end of the handle carrier, but it may not be deep enough axially to clear both nuts. Then is a smaller hole in the casting that allows the drive screw to pass thru. If I were to remove that, my drive nut carrier will overpass the ways v peak, which would gain me some more out travel. But I'd much rather not remove it as its strength in the crossfeed, but not allergic to boreing it out enough to clear the nuts I haven't made yet. Removal on the mill would be easy as that could be done from the top. Boring it out would be quite some work with a Dremel cable driven hand tool because its about 4" inside the handle carrier hole in the saddle, which would have to be mounted on a stand on the mill table so that I can lay the head down and figure out how to mount the dremel to the mills head. Lots of dust from worn stones as its only a fat 3/8"hole now. I'll do most anything to keep from contemplating that job. Including dropping a 1/4" mill in from the top, and expanding that pocket to the front of the saddle far enough the end of the handle boss would be sunk enough thou when screwed in to serve as a swarf shield for that thrust bearing, as I intend that to be the inside thrust bearing seat anyway. That wouldn't get me any more crossfeed travel, but it sure would give me room for the nuts, and would clear the OD of the thrust bearing. Complicated by the two bearing washers being dead identical. Leave it to VFX to screw it up. Presently, I'll have to stick sandpaper on a rod, and take about 2 though off the threads internal peaks as that thread is non-std, and won't allow the thrust bearings washers to pass without a struggle. The handle carriers peaks are about 3 thou larger than 7/8" and sharp enough to shave with. So are the internal threads. A turn loose and its darned near air-tight yet. A smoothly machined area there would allow an oversized washer to be fitted for an interference fit for a swarf shield. Possibly spinning against a felt washer. This thing has turned into a 1500lb casting I can make a lathe out of. But it will take me a while. :( Thanks Andy. 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
