The Sherlines have anodized aluminum parts. The anodize layer is an insulator.
Greg R Rogers wrote: > Pete, > > I guess I should do a little more reading and a little less thinking..lol. I re-read > his post and now I see what he meant. Thats another version of an electronic > edge-finder of sorts. I agree, that wouldnt work for most mills. I'm surprised that > it does read different resistance. > > Ron > > vavaroutsos <[EMAIL PROTECTED]> wrote: > > > Ron, I may have mis-understood what Chuck was saying, but I think he > is measuring the electrical resistance from the work to the spindle, > not the resistance to movement on the axis. This would require that > the work be electrically isolated from the mill or the probe be > electrically isolated. Things may have worked ok in Chucks case due > to the construcion of the mill not providing much electrical > conductivity from the spindle to the table, but I don't think this is > a valid assumption for all mills. > > ~petev > --- In [EMAIL PROTECTED], R Rogers > wrote: > >>Interesting concept. However what may seem absolute is often not. > > Measuring resistance upon contact is measuring the effects of a slow > minute crash. Contacting a surface to the point the drive begins to > struggle would not be touching off on an edge. Due to deflection. I'm > not ruling out that this would be accurate. It would require testing > involving the method you perscribed versus a conventional edge > finder. If the results parallel that would be a great edge-finding > technique. Design into a machine control software to enter a setup > screen that when resistance is sensed upon a drive it would > automatically zero that axis, spindle rotating as this is more > accurate. Would need to be able to distinguish between touching and > fast jog resistance measured. Could even have a compensation preset > for the radius of the stylus. None for Z obviuosly. Possibly an > extremely stiff die spring in the shank of the edge finder to prevent > damage on over-travel. This would be alot faster than present > >>method. Sometimes when I'm in a hurry I just use the end-mill for > > the cut as an edge finder, step-jog to touch and then add the radius. > >>For measuring backlash, a good dial indicator is pretty tough to > > beat. It's not something that is measured all the time. > >>Ron >> Addresses: FAQ: http://www.ktmarketing.com/faq.html FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/ Post Messages: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] List owner: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Moderator: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [Moderators] URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. http://www.metalworking.com/news_servers.html http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
