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Thread: Optical Center Punch Self Holding Punch

  1. #21
    jjr2001's Avatar
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    Hi Marv, I had never seen the Cosac prior to today. Nice example of a cool tool.
    I like the one you designed with only a single piece of brass and the center punch.

    I must make one of them..

    Thanks for your input.

    Cheers, JR

  2. #22
    garage nut's Avatar
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    I never see it as criticism, there is always more that one way of doing something and the circumstances will dictate which is more appropriate to use, It is merely for you to have all these options available.
    I have 4 sets of spanners and when I bought the 5th set a week ago the "other half" had a lot to say. I bought those ones with the little ratchets on the one side and normal open end on the other. Had to explain why sometimes only an open end can work, sometimes only a huge offset ring and sometimes you need very thin spanners to hold a half nut.
    So from my side thanks to all out there sharing their ideas and a Happy tooling new year,

  3. #23
    mklotz mklotz's Avatar
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    Quote Originally Posted by jjr2001 View Post
    Hi Marv, I had never seen the Cosac prior to today. Nice example of a cool tool.
    I like the one you designed with only a single piece of brass and the center punch.

    I must make one of them..

    Thanks for your input.
    It has a surprising second use as well. Read the full story here...

    One tool - two uses
    ---
    Regards, Marv


    Home Shop Freeware
    http://www.myvirtualnetwork.com/mklotz

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    jjr2001 (01-01-2018)

  5. #24
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    Thanks Marv,
    Excellent. That is one way to make a useful tool even more useful.

    Cheers, JR

  6. #25
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    Three uses for one tool

    Ok, I just had to try one of these for myself and was happy to see how well it works for center punching.
    Not bad for corner finding as well like Marv pointed out in this link:
    One tool - two uses
    Now make that three uses with my new version that combines Marv's type with RR (Randy Richards) stamp aid
    and you get this:
    Attached Thumbnails Attached Thumbnails Optical Center Punch Self Holding Punch-img_1440a-copy.jpg   Optical Center Punch Self Holding Punch-img_1439a-copy.jpg   Optical Center Punch Self Holding Punch-img_1438a-copy.jpg  

  7. The Following 2 Users Say Thank You to jjr2001 For This Useful Post:

    garage nut (01-04-2018), PJs (05-14-2018)

  8. #26
    garage nut's Avatar
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    what are the approximate sizes there?

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    jjr2001 (01-05-2018)

  10. #27
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    Quote Originally Posted by garage nut View Post
    what are the approximate sizes there?
    Oops, I forgot to put in the dimensions.

    The largest is the brass one. It is made from 1.25" diameter brass stock and is 1.2" long. Center hole was made for a sliding fit with a .177" piece of drill blank.
    Slot is a slide fit for my stamps which came to .242" wide and about .175" deep so the stamp is proud of the top of the brass.
    Under that slot is a hole made with a 1/4" drill bit for the magnet. The two milling cuts were made to the center of the hole on both the x and y axis.

    The knurled steel guide is 3/4" in diameter and 1.500 inches long.

    The straight steel guide is 1.250" long and 3.4" in diameter.

    Same punch is used in all of them.

    Cheers, JR

  11. #28
    garage nut's Avatar
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    Thanks, great addition for the letter/number stamps.


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