On 01/17/2014 12:26 PM, andy pugh wrote: > On 17 January 2014 17:30, Dave Caroline <[email protected]> wrote: > >> given a mill like >> http://www.lathes.co.uk/harrisonmiller/img1.gif > > > That being the exact machine, yes :-) > > then mount the dti on the table top and measure against the front flat >> below the horizontal spindle sliding the table side to side for >> minimum deflection. >> > > Hmm, now why didn't I think of that? I had concluded that the other way > round was no good, but didn't think of inverting it. > > But some machines have a marking or detent to easily get back to square. >> > > There is a mark, but I am not sure how much I trust it. The DTI as you > suggest would answer that question, assuming that the Y is perpendicular to > the Z slide face. > > Setting a square parallel to the T-slots and testing both ways sounds > ideal, except for me not having a suitable square. Hello eBay my old > friend..... > > Once I know it is spot-on I can make a square that fits into the T-slots. > Maybe: begin with basics making sure overarm centerline and Y motion are parallel.
dti on cockeyed table, tip on spindle overarm crank Y in & out to insure spindle is parallel to y travel ( or consider the error in further wrighting ) Next put dti on table and tram over Z ways by moving X ( extend with a parallel if necc ) This X tramming should show up X motion parallel to Z guide surfaces. Once you find square, snug it, recheck & if ok, lock it down. Maybe: drill and ream 2 holes in bottom of rearmost t-slot for dowels to tram over later. Maybe: a parallel jig between dowels and Z guides to ´quick square' Nice mill! i can see gears using that action. regards TomP tjtr33 ( I think the face below spindle is not a machine ref, while the Z guideways are. And tho the Z guides are meant to align Z motion, i doubt this mfctr did not make their faces parallel to X travel.. i may be wrong :) ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
