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Thread: Counter Bore Sharpening Fixture

  1. #1
    rossbotics rossbotics's Avatar
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    rossbotics's Tools

    Cool Counter Bore Sharpening Fixture

    After making the Counter Sink Sharpening Fixture about aweek ago made me think about other cutters I have, it just happened that the counter bores could use a little sharpening, so I decided to make another fixture for sharpening them.

    I utilized the 5C spindle from my end mill sharpening fixture; its one of those grinding fixtures that allows you to sharpen the primary and secondary angles on the bottom of an end mill, this 5C spindle already has indexing holes that's stamped 2-3-4-6-8-12 on its face, so all I had to do was make an 85 angle plate and bore it to accept the 5C spindle plus drill and tap an indexing lock screw hole.


    The angle plate consist of two pieces of 1018 steel, one piece is 1 X 3 X 3 and the other piece is 1/2" X 3 X 3 , the larger 1 piece is bored in the center to accept the 5C spindle along with a tapped hole in the top of the plate for the indexing thumb screw, the front edge of the plate was machined at a 5 angle for the cutters relief angle, after all the parts were completed they were then assembled and ground together as a whole unit.


    Setup is quick and simple, you just sit the fixture on the magnetic chuck of the grinder with the 5 edge against the back rail on the magnet, the 5 angle is what gives you your cutting edge clearance.

    I took one of my smaller grinding wheels from the surface grinder and dressed it on one side at a 45 to clear the pilot on the counter bore, you can also sharpen counter bores using the milling machine with this fixture by making an arbor for a flared cup grinding wheel with a shank to fit a collet, install it into the spindle ofthe mill, crank up the RPMs and grind the cutting edges.


    I have included a few photos of the machining processes along with a demonstration video.


    As always thanks for looking and happy machining


    Doug

    Counter Bore Sharpening Fixture-1.jpg Counter Bore Sharpening Fixture-2.jpg Counter Bore Sharpening Fixture-3.jpg

    Counter Bore Sharpening Fixture-4.jpg Counter Bore Sharpening Fixture-5.jpg Counter Bore Sharpening Fixture-6.jpg

    Counter Bore Sharpening Fixture-7.jpg Counter Bore Sharpening Fixture-8.jpg Counter Bore Sharpening Fixture-9.jpg

    Counter Bore Sharpening Fixture-10.jpg Counter Bore Sharpening Fixture-11.jpg Counter Bore Sharpening Fixture-12.jpg

    Counter Bore Sharpening Fixture-13.jpg Counter Bore Sharpening Fixture-14.jpg

    <span style="font-family: Calibri"><font size="3"><font color="#000000">
    Comments are always welcome
    Doug

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  2. The Following 12 Users Say Thank You to rossbotics For This Useful Post:

    almarghi (09-03-2018), aphilipmarcou (09-04-2018), darkoford (09-01-2018), Frank S (09-01-2018), Jon (09-03-2018), LMMasterMariner (09-05-2018), MountainMan (09-05-2018), Okapi (12-27-2018), olderdan (09-06-2018), Papa Bill (09-09-2018), Seedtick (09-03-2018), Tule (12-27-2018)

  3. #2
    Content Editor DIYer's Avatar
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    Thanks rossbotics! We've added your Counterbore Sharpening Fixture to our Sharpening category,
    as well as to your builder page: rossbotics's Homemade Tools. Your receipt:



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    dethrow55's Tools
    Hello doug, james in txs. you sure make some cool tools. excellent work.

  5. The Following User Says Thank You to dethrow55 For This Useful Post:

    PJs (09-04-2018)

  6. #4
    rossbotics rossbotics's Avatar
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    Quote Originally Posted by dethrow55 View Post
    Hello doug, james in txs. you sure make some cool tools. excellent work.

    Well thank you very much !

    Doug
    Comments are always welcome
    Doug

    Subscribe to my you tube channel

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    rossbotics (09-04-2018)

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    PJs
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    Just the best in creative designs, write up's, pics and now video's. Your videos get better every time Doug!! Excellent. When I grow up I'd be happy to sweep floors in your shop for free! Hope you and yours are safe from the storms.

    Thanks Much for all you share...a true gift to the community.

    Best Regards,
    PJ
    Always do right. This will gratify some people and astonish the rest.
    Mark Twain

  10. #7
    rossbotics rossbotics's Avatar
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    Thank You very much PJs you always have the most nicest things to say about everyone, including me.
    I do try to keep the floors pretty clean and the equipment but once in a while I could use your help.
    I enjoy sharing my tool designs with all the community hoping they will intrigue people to use their minds more,
    We are right in the middle of Florida so the storm had no impact on use, but thank you for your concerns.

    Thanks Again PJs
    Doug
    Comments are always welcome
    Doug

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    PJs (09-10-2018)

  12. #8
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    old_toolmaker's Tools
    Another very nice tool, Doug!

    What is the little surface grinder pictured? I don't recognize it.

    Dick
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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    Another great build Doug!!!! You can tell you take a lot of pride in your work. Thanks for sharing!!
    Dave
    "I have not failed...I've just found 10,000 ways that wont work"
    Thomas Edison

  14. #10
    rossbotics rossbotics's Avatar
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    Quote Originally Posted by old_toolmaker View Post
    Another very nice tool, Doug!

    What is the little surface grinder pictured? I don't recognize it.

    Dick
    Hi Dick
    First thank you very much for your compliments, The surface grinder is a 6" X 12" Delta-Milwaukee Tool Makers Grinder it was made in 1945, It has a high grade tapered bronze front spindle bearing and an angular contact bearing on the drive end and it runs so smooth, I got the grinder from an old gent about 10 years ago, the old gent said his father bought it new, when I got it I took it completely apart, and went over it with a fine tooth comb, replaced a few things here and their, but it does a nice job, here is a link to my web site, it shows the grinder before and after restore.

    https://rossbotics.wixsite.com/machiningtechniques

    Thanks again
    Doug
    Comments are always welcome
    Doug

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