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Link source: https://knoba.wordpress.com/2015/07/...-centre-punch/
CAD file: https://www.dropbox.com/s/2qhmuuqipj...02015.dxf?dl=0
Thanks Ken!
Link source: https://knoba.wordpress.com/2015/07/...-centre-punch/
CAD file: https://www.dropbox.com/s/2qhmuuqipj...02015.dxf?dl=0
Thanks Ken!
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)
Nice tool, knoba!
Altair (Aug 8, 2015), emu roo (Dec 9, 2025), knoba (Aug 8, 2015), mwmkravchenko (Jun 10, 2020)
Thanks DIYer!
emu roo (Dec 9, 2025)
Pretty thing to look at and look into. Great idea on the crosshairs. Spot on!
Al
wow thats a nice punch eyeglass as good as mine. :O)
emu roo (Dec 9, 2025)
Thanks guys'!
Mornin' Cap!
There's nothing shoddy about your punch, mine just looks fancy in a round tobacco tin...
i'm gonna get a tin toooo...:O)
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:
emu roo (Dec 9, 2025)
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!
emu roo (Dec 9, 2025)
I'm not that smart!Originally Posted by PJs
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!
The radius of the optic was set to allow for some manual adjustment, later by trial and error, on the lathe. The actual radius ended up somewhere near 9/16th. The optic was gradually altered until it appeared to give a good magnification without too much distortion. Only the top surface of the curvature of the optic needs modifying as needs require.
Sometimes I get stuck knowing where to start with a project (like with my welding turn table). My answer, to myself, is just to start it, anywhere, somewhere, the answers will define the questions that need to be asked.
Thank you for your compliments!
Let's not forget the pink packing foam. It was specially imported from China...
**Have updated the cad file and changed the optic to a 14mm radius.
Last edited by knoba; Aug 12, 2015 at 01:38 AM.
Paul Jones (Aug 12, 2015), PJs (Aug 12, 2015)
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