Thread: Trueing up chuck jaws
I want to mount my pencil air-powered diegrinder on my lathe's cross-slide so I can true up the jaws of my chuck, along the lines of this article (at the bottom of the page).
The tricky bit will be getting the grinding wheel shaft parallel to the bed so that the jaws end up ground parallel... The cross-slide on my lathe is mounted on an ungraduated swivel and I have yet to find an accurate way to lock it so the slide travel is perpendicular to the bed...
The best solution I have come up with to get the slide perpendicular to the bed is to put the DTI on the cross-slide and the plunger on one edge of the chuck face, then spin the chuck to find the min and max values and rotate to set it midway, then keeping the chuck stationary, traverse across the face of the chuck and adjust the slide swivel to get the same reading and keep traversing back and forth and adjusting until it is constant across the face. That gets the slide right, but then how do I get the die grinder shaft parallel to the bed. Its not long enough to DTI sensibly along the shaft over the travel of the saddle.
No, of course I'll use the longtitudinal feed to feed the grinder into the jaws but i need to use the cross-slide to mount it on else it will be too low on the saddle alone and i'll still need the cross-slide to position it offset relative to chuck centre line. The issue is how to position the grinding wheel parallel to the bed. Or are you suggesting it doesnt need to be as long as sufficient of the wheel contacts the jaws while traversing along the bed? I realise you move it in and out of the jaws till no more metal is being removed so maybe the alignment of the grinding wheel is not critical as long as some of the wheel contacts the jaws.
Making the retainer is a problem right now tho. The solution I think is to holesaw a 22mm hole in some 1/4" Ali sheet and then cut into 3 segments as shown in the article, drill and slot, then bolt together and use a file to even the edges up (I can't use the mill yet, but maybe I'll wait a couple of weeks till I can - its nearly done).
By Scott in forum Milling Machines, Builds & ConversionsReplies: 2Last Post: 28-01-2012, 03:19 PM
By Pmac in forum Tool & Tooling TechnologyReplies: 4Last Post: 28-01-2010, 06:55 PM
By irving2008 in forum Machine DiscussionReplies: 1Last Post: 16-11-2009, 12:09 PM
By irving2008 in forum Machine DiscussionReplies: 3Last Post: 30-08-2009, 08:55 PM
By irving2008 in forum Tool & Tooling TechnologyReplies: 25Last Post: 24-11-2008, 07:41 AM