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Thread: Shop Made Tools

  1. #3401
    Join Date
    Jan 2017
    Posts
    262

    Default

    Shameless copy of commercial product, as posted about here:
    http://bbs.homeshopmachinist.net/thr...optical+center



    Scribed lines


    Punch centered on lines - the wonkiness is a matter of camera angle:


    In high school shop class 60 years ago, my biggest weakness was drilling holes where they were supposed to be. It's still a challenge for me. I'm hopeful that this punch will help.

    Parallax is pretty much a non-issue with the punch's lines being scratched on the bottom.

    The lines were scratched by a carbide scribe held in the mill. I wasn't real careful on the lathe about keeping the top and bottom surfaces parallel, so it was difficult making the scratch depth consistent - some fiddling involved. I'll know better next time.

  2. #3402
    Join Date
    Jan 2014
    Location
    Long Island, N.Y.
    Posts
    2,539

    Default

    Very nice. What kind of plastic is that?

  3. #3403
    Join Date
    Jan 2017
    Posts
    262

    Default

    Quote Originally Posted by RichR View Post
    Very nice. What kind of plastic is that?
    Acrylic, aka Plexiglas. I think - it's something that I found at our dump, so I'm not positive.

  4. #3404
    Join Date
    Jul 2016
    Location
    Brampton, Ontario
    Posts
    589

    Default

    I wonder if there's a way to keep the bottom from getting scratched with use.

  5. #3405
    Join Date
    Nov 2006
    Location
    durban s africa
    Posts
    1,274

    Default

    Whats the business end look like? Is it just a punch. Looks clumsy to use.

  6. #3406
    Join Date
    Feb 2018
    Location
    Asheville, NC
    Posts
    78

    Default

    Quote Originally Posted by mattthegamer463 View Post
    I wonder if there's a way to keep the bottom from getting scratched with use.
    Acrylic is comparitively hard for a thermoplastic.

    One could use 3 pieces of tape on the bottom to form a tripod a few thousanths thick in order to keep the base off the working surface.
    Bill Pendergrass
    Rotec RM-1 w/Rusnok head
    Atlas TH42 QC10

  7. #3407
    Join Date
    Dec 2016
    Location
    Helsinki, Finland, Europe
    Posts
    2,669

    Default

    Quote Originally Posted by mattthegamer463 View Post
    I wonder if there's a way to keep the bottom from getting scratched with use.
    Make one from sapphire optical flat

  8. #3408
    Join Date
    Aug 2013
    Location
    Australia
    Posts
    85

    Default

    Make one from sapphire optical flat
    Could be interesting - sapphire has a Mohr hardness of 9.
    Yes, you can machine it with diamond tooling, but slowly and under water.

    Cheers
    Roger

  9. #3409
    Join Date
    Mar 2013
    Posts
    1,483

    Default

    Iphone screen protector gorilla glass. Still need diamond to cut it without shattering probably but it already has an adhesive on it.

  10. #3410
    Join Date
    Dec 2009
    Location
    Stevens Point, WI
    Posts
    7,447

    Default

    Just use a diamond.
    Andy

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