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Thread: Optical centre punch

  1. Aug 7, 2015, 04:58 PM #1
    knoba
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    Optical centre punch



    Link source: https://knoba.wordpress.com/2015/07/...-centre-punch/

    CAD file: https://www.dropbox.com/s/2qhmuuqipj...02015.dxf?dl=0

    Thanks Ken!

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  2. The Following 17 Users Say Thank You to knoba For This Useful Post:

    emu roo (Nov 2, 2024), gunsgt1863 (Oct 30, 2017), high-side (Jun 11, 2020), HobieDave (Mar 28, 2020), janders1957 (Jul 28, 2018), jere (Aug 12, 2015), johncg (Nov 25, 2022), Jon (Aug 11, 2015), kbalch (Aug 10, 2015), mwmkravchenko (Jun 10, 2020), oldcaptainrusty (Oct 29, 2017), olderdan (Oct 29, 2017), Paul Jones (Aug 8, 2015), PJs (Aug 11, 2015), tonyfoale (Oct 29, 2017), will52100 (Jun 9, 2020), zarembak (Jul 26, 2018)
  3. Aug 7, 2015, 08:40 PM #2
    DIYer
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    Nice tool, knoba!
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  4. The Following 4 Users Say Thank You to DIYer For This Useful Post:

    Altair (Aug 8, 2015), emu roo (Dec 9, 2025), knoba (Aug 8, 2015), mwmkravchenko (Jun 10, 2020)
  5. Aug 8, 2015, 12:12 AM #3
    knoba
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    Thanks DIYer!

    Blog - https://knoba.wordpress.com/
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  6. The Following User Says Thank You to knoba For This Useful Post:

    emu roo (Dec 9, 2025)
  7. Aug 8, 2015, 05:32 PM #4
    Altair
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    Pretty thing to look at and look into. Great idea on the crosshairs. Spot on!

    Al
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    emu roo (Dec 9, 2025), PJs (Aug 11, 2015)
  9. Aug 8, 2015, 08:55 PM #5
    Captainleeward
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    wow thats a nice punch eyeglass as good as mine. :O)
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  10. The Following User Says Thank You to Captainleeward For This Useful Post:

    emu roo (Dec 9, 2025)
  11. Aug 9, 2015, 02:40 AM #6
    knoba
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    Thanks guys'!

    Mornin' Cap!

    There's nothing shoddy about your punch, mine just looks fancy in a round tobacco tin...

    Blog - https://knoba.wordpress.com/
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  12. The Following 2 Users Say Thank You to knoba For This Useful Post:

    emu roo (Dec 9, 2025), PJs (Aug 11, 2015)
  13. Aug 9, 2015, 02:20 PM #7
    Captainleeward
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    i'm gonna get a tin toooo...:O)
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  14. The Following 2 Users Say Thank You to Captainleeward For This Useful Post:

    emu roo (Dec 9, 2025), PJs (Aug 12, 2015)
  15. Aug 10, 2015, 02:15 PM #8
    kbalch
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    Thanks knoba! I've added your Optical Center Punch to our Measuring and Marking category, as well as to your builder page: knoba's Homemade Tools. Your receipt:

    13 New Topic Ideas || How to Upload Photos || How to Set Your Custom Avatar || Must Read Homemade Tool Topics
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  16. The Following User Says Thank You to kbalch For This Useful Post:

    emu roo (Dec 9, 2025)
  17. Aug 11, 2015, 03:31 PM #9
    PJs
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    Knoba, Like I said I just love this thing and will be making one soon but realized you had a 17.8885mm spherical radius for your optics...how on earth did you determine that let a lone make it? I'll have to hunt for a tin though!
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  18. The Following User Says Thank You to PJs For This Useful Post:

    emu roo (Dec 9, 2025)
  19. Aug 11, 2015, 05:14 PM #10
    Okapi
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    A really good and unexpensive idea !
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    emu roo (Dec 9, 2025)
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