It doesn't matter, the wheel diameter is going to change in time due to use so it will effect the final part dims, this is why cam grinding requires multiple passes [one reason]. I've seen machine tools that use lasers to measure wear on end mills and such, I suppose that is possible w/ a stone as well but probably an expensive pc of hardware [laser micrometer].
J Johnson > My understanding was that grinding doesn't require wheel diameter > correction because the precision grinding happens on one side of the > wheel: > > |____| wheel moves this way --> > -----xx----------------------------------workpiece > > On 6/14/11, Martin Dobbins <[email protected]> wrote: > > > > Sherline sells a miniature version of what you are talking > about, and since > > they sell their CNC machines with EMC installed it's probably > done with > > that. There's a picture here: > > > > http://www.sherline.com/images/CamGrindCallouts.jpg > > > > and a couple of you tube videos here: > > > > http://www.youtube.com/watch?v=OIWyGtXEgR4 > > > > and here: > > > > http://www.youtube.com/watch?v=PlZDg0rpIi8 > > > > I understand Joe Martin (owner of Sherline) hand wrote the G > code for this, > > he might let you have it if you drop him a note. > > > > Hope that helps? > > > > Martin > > > > > >> > >> Guys, > >> > >> I know a guy who is interested in using EMC2 to control a cam > grinding>> operation - as in automotive type camshafts cam lobe > grinding.>> > >> Usually a large diameter grinding wheel is moved in and out to > grind the > >> cam profile. Compensation for the wheel diameter is required. > >> > >> Has anyone ever done this before with EMC2 or otherwise? > Attached is > >> a diagram which is exaggerated in that the grinding wheel is > usually>> much larger. > >> > >> A cam grinding machine looks like a lathe but the grinding > wheel which > >> is usually .75 inches wide and usually quite large - perhaps 12 > inches>> or more in diameter and it moves in and out as the > camshaft revolves to > >> grind the profile. > >> > >> Here is a diagram that shows the wheel to cam situation: > >> http://imagebin.org/158266 > >> > >> Dave > >> > >> ---------------------------------------------------------------- > -------------- > >> EditLive Enterprise is the world's most technically advanced > content>> authoring tool. Experience the power of Track Changes, > Inline Image > >> Editing and ensure content is compliant with Accessibility > Checking.>> http://p.sf.net/sfu/ephox-dev2dev > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ----------------------------------------------------------------- > ------------- > > EditLive Enterprise is the world's most technically advanced content > > authoring tool. Experience the power of Track Changes, Inline Image > > Editing and ensure content is compliant with Accessibility Checking. > > http://p.sf.net/sfu/ephox-dev2dev > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------- > ----------- > EditLive Enterprise is the world's most technically advanced content > authoring tool. Experience the power of Track Changes, Inline Image > Editing and ensure content is compliant with Accessibility Checking. > http://p.sf.net/sfu/ephox-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
