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
