Hello everybody, My father, my brother and I have a little workshop and we make camshafts as spare parts for the local market here in Argentina.
Given the situation in our country with the medium and little manufacturers like us, it's almost impossible for us to adquire a CNC camshaft grinding machine (A seller once quoted me one 1995 landis for $195,000 dolars), so that says pretty much all. Obviously we use standard grinding machines, with a master that guides a pivot to make the shape of the lobe. Anyway, the problem is that new cnc camshaft grinders, have linear motors, and hydrostatic ways, so it's really complicated to adapt an existing machine to achieve the quality that new machines have, also the new ones weight 10 tns like the old ones, so it's like retrofitting a train. But I think that with a ballscrew may be good results can be achieved, obviously not as good as the ones with an original machine. Another way would be to attach a servo motor on the pivot, and then move it to recreate the shape of the lobe instead of using a master. I'm really interested in this project so I hope I can help! Thanks as always for this space, and for good job with EMC! Best regards. Leonardo Marsaglia. 2011/6/14 H & J Johnson <hjjohn...@sasktel.net> > 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 <tu...@hotmail.com> 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 > > >> Emc-users@lists.sourceforge.net > > >> 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 > > > Emc-users@lists.sourceforge.net > > > 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 > > Emc-users@lists.sourceforge.net > > 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 > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
