Photo 1 of 1 from Small surface plate tester

Photo Comments

1. 
   thehomeengineer - Apr 18, 2018, 01:39 AM - permalink

   Hi
   Not seen these before how does it work?
   I can see the dial test indicator, which I guess shows any discrepancy but unsure how you would use it. Sorry if I am being a bit stupid but very interested.
   The Home Engineer
2. 
   Lima2088 - Apr 19, 2018, 12:35 AM - permalink

   Works the same as a Rahn Repeat-O-Meter (ROM), detects surface plate imperfections from a given (assumed) flat zero. Owning a small 12"x18" surface plate, a 12" long ROM takes more room than it measures. This version is 6.5" OAL. Here's an NYC CNC link to their build: https://www.youtube.com/watch?v=ra727zZCMzk
   The real question is "Do you need one?" If you're buying a used or want to grade your exist surface plate, it helps. If there's interest, I'll make dimension drawings in PDF.
3. 
   Lima2088 - Apr 19, 2018, 12:41 AM - permalink

   PB link: http://s1333.photobucket.com/user/F-...?sort=2&page=1
4. 
   thehomeengineer - Apr 19, 2018, 01:13 AM - permalink

   Thank you for the additional information very interesting project. We have a large engraver at work and the table is all over the place (I think) so was interested to see how your project works to test our machine table.
   Thank you again for taking the time to provide the video and photos.
   The Home Engineer
5. 
   Lima2088 - Apr 19, 2018, 06:02 AM - permalink

   Here's a couple more YT surface plate resurface vids from Oxtools and Robin Renzetti (sp?):
   https://www.youtube.com/watch?v=EWqThb9Z1jk
   https://www.youtube.com/watch?v=sKwZxV4bUoA
   
   Hmmm, lemme get cracking on the dim dwgs. Will PM when done. BTW, bought the cheapest 0.0001 DI from fleabay ($26). Tested with various measured shim stock and is +/- 0.0001 repeatable.