I haven't closely followed this thread but what is wrong with the traditional method of sweeping a DTI attached to the end of an L-shaped rod secured in the spindle? Simple, time tested and very accurate.
> -----Original Message----- > From: Gene Heskett [mailto:[email protected]] > Sent: Tuesday, August 18, 2015 12:26 PM > To: [email protected] > Subject: Re: [Emc-users] Resetting a tilt-able head to plumb? > > On Tuesday 18 August 2015 11:50:30 Russell Brown wrote: > > > Quoth Gene Heskett..... > > > > >indicates the head may be tilted a fraction of a degree. > > > > Look for Hoss's G0704 tramming videos on Youtube: > > > > https://www.youtube.com/watch?v=40Q61UAnOTA > > > > He shows how it's done with silver steel^W drill rod and a DTI. Tram > > the spindle to the column first as these rotating head mills do seem > > to go out of alignment and the sticky label position indicator isn't > > worth the paper it's printed on. > > This one also has a scribed mark right on the face of the Z sled casting, and its > this mark I tried to use when I remounted the head. > > > When you get a chance it's also worthwhile fitting some little > > tramming aids to your G0704 (see here > > http://www.cnccookbook.com/CCMillTramAdj.html). Not only to they make > > the fine adjustment easier, they also hold the whole thing steady > > while you tighten up the head bolts (I say 'bolts' as a popular mod is > > to add two more than the standard single bolt: google g0704 three > > bolt mod). > > > This one already has that mod as shipped, 4 bolts total, one centered on the > axis of the tilt, and 3 more, one size smaller in a sliding track around it. That > track is as cast, some sort of a plug dropped into the mold I have to assume, > having done some iron casting one summer, '58 I think. > > > FWIW, on my WMD30LV (the G0704's bigger brother) I ended up shimming > > the bottom of the tilty bit of the head where it meets the Z saddle to > > get the spindle in line with the column *and* the base of the column > > to get the, now aligned, spindle in tram with the table. > > Interesting, so I should not only check the side of the rod, but the front face > too. I hadn't considered that might be needed. But measuring the out of square > of the column may be beyond the ability of my tools. > > For that, I wonder if a medium sized, trustworthy square, one leg on the table, > the other against the machined face of the column might suffice. > I'd have to remove all the swarf shielding to get full length access. > Keyword there is trustworthy of course. Plastic ones do not even get to the > cashier in my cart, but... > > Z Gibs too loose would compound that error too. Whole can of lively worms I > have here it seems. > > Thanks Russell. > > 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 ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
