On Monday 28 January 2019 12:17:03 Jon Elson wrote: > On 01/28/2019 04:28 AM, andy pugh wrote: > > One oddity from Holbrook that I have not seen elsewhere > > (and isn't actually a feature of the H17 in the original > > advert) is a double dovetail on the cross slide. There is > > a part rather like a butterfly shape, fitting into a > > female dovetail in the saddle and another female dovetail > > in the cross slide. The cross slide nut is mounted in this > > dovetail, and normally it is rigidly bolted to the saddle > > by a conical bolt. But you can move that conical bolt to > > the taper-turning slide, and then you have completely > > independent taper and cross slide motion. (with typical > > taper-turning systems you have to use the compound slide > > to adjust the cut) > > http://www.lathes.co.uk/holbrook-B-13-71-21/ It is curious > > that the Sheldon R series is absent from lathes.co.uk, but > > then so is the Holbrook H series. > > I didn't quite understand this description, but if you have > a taper attachment on the Sheldon R-series, it is a > "telescopic" taper attachment. So, the crossfeed screw ADDS > an adjustment to the taper attachment. I think this is what > you might be referring to. I think a number of larger > toolroom lathes have this feature. I think on the Sheldon, > you just turn two handles to switch how the nuts are > clamped, you don't have to move a bolt. (Wish I had the > taper attachment on my lathe! I could probably build one, > but I haven't because I might CNC it "someday". > > Jon > I'd offer you mine Jon, but I suspect its too small for your bigun, as mine is an 11 by, and I kept the crossfeeds long cover section, filling the top slot to swarf proof my x screw, filled the bottom of the carriage too so the air hose can't blow swarf up out of the pan I put under the ways to catch most of the swarf in. The drive nut will have to be made new anyway, someone had helicoiled it, and it was worn to about 85 thou of backlash, another 5 thou and it would have been stripped again. Anmasingly. the screw isn't hurt! > > _______________________________________________ > 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
