tag:blogger.com,1999:blog-12223283.post115200590399762336..comments2009-02-28T11:54:13.852ZAdrian Bowyerhttp://www.blogger.com/profile/17595509188999219420noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-12223283.post-1152170335061758592006-07-06T08:18:55.063+01:002006-07-06T08:18:55.063+01:00Ed, Yes, that would be nice to see more photos, I think I half understand your anti-backlash device, but would like to understand the other half! ;)<BR/><BR/>Plaas, and digital calipers are so inexpensive, I could of bought three for the price I paid for a mechanical one 20 years ago. Argh!Yvan Royhttp://www.blogger.com/profile/14473970544348533290noreply@blogger.comtag:blogger.com,1999:blog-12223283.post-1152109861325370322006-07-05T15:31:01.326+01:002006-07-05T15:31:01.326+01:00Pics are good! I'd also like to see a pic of how you bolted that digital caliper onto your z-stage. I'm thinking about buying a digital caliper. :-)plaasjaapiehttp://www.blogger.com/profile/00240780042458014636noreply@blogger.comtag:blogger.com,1999:blog-12223283.post-1152099084305123062006-07-05T12:31:24.306+01:002006-07-05T12:31:24.306+01:00Well, there's actually an anti-backlash mechanism built into the design to give gravity a helping hand. And I'm sure that's the reason for such good repeatability. The mechanism is simply: driven nut forced down onto the thread with a spring pushing against a trapped nut which travels at a set distance with the driven nut. That might be easier witha picture... let me knoweDhttp://www.blogger.com/profile/16719815680560641865noreply@blogger.comtag:blogger.com,1999:blog-12223283.post-1152076072589626632006-07-05T06:07:52.590+01:002006-07-05T06:07:52.590+01:00I'm impressed with the accuracy, great stuff. I guess with gravity providing the antibacklash, it will stay accurate even as the threaded rod wears out with use.Yvan Royhttp://www.blogger.com/profile/14473970544348533290noreply@blogger.comtag:blogger.com,1999:blog-12223283.post-1152054692453264472006-07-05T00:11:32.453+01:002006-07-05T00:11:32.453+01:00No - Ed bolts a digital caliper to the machine, which is accurate and repeatable to 0.01mm.Adrian Bowyerhttp://www.blogger.com/profile/17595509188999219420noreply@blogger.comtag:blogger.com,1999:blog-12223283.post-1152021060028225352006-07-04T14:51:00.026+01:002006-07-04T14:51:00.026+01:00So how are you determining that you've got back to start? Simple counting or a limit detector?plaasjaapiehttp://www.blogger.com/profile/00240780042458014636noreply@blogger.comtag:blogger.com,1999:blog-12223283.post-1152020781895767792006-07-04T14:46:21.896+01:002006-07-04T14:46:21.896+01:00BRILLIANT! Congratulations! :-Dplaasjaapiehttp://www.blogger.com/profile/00240780042458014636noreply@blogger.com