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Thread: Direct Indexing Sharpening Fixture

  1. #1
    rossbotics rossbotics's Avatar
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    Direct Indexing Sharpening Fixture

    On my last post I had designed and built a dividing fixture for cutting some metric gears, Well that all came out fine and dandy, Now the cutters are dull !!
    So I designed a fixture to resharpen the cutters using my surface grinder, In the photos you will notice I have set the surface grinder up with a flared cup wheel, That's just to show the process, I have ordered a 30° dish wheel which will do the actual grinding of the cutters.

    The majority of the fixture was made from 1018 C.R.S. All except for the indexing pin which is O-1 drill rod that has a hardened point, The 2 knobs were made from 360 brass round. All surfaces were precision ground before assembly.

    I decided to use the direct method of indexing instead of the blade type, Which uses an existing tooth for indexing, This type of indexing will allow me to do a lot of different things other than just sharpening, This fixture can also be clamped in the Mill vise or on the table as well.

    I'm using a NEW 36 tooth gear for dividing, Which will also allow me to make a lot of different divisions that are equally divided, Such as 2,3,4,6,9,12,36, I also have a variety of other NEW gears with the same pitch with different numbers of teeth which will make this a very useful tool.

    Below are some photos

    As always thanks for looking and happy machining

    Doug

    Click here to purchase a set of these plans Direct Indexing Sharpening Fixture Plans


    Direct Indexing Sharpening Fixture-1.jpg

    Above photo shows all parts made and ground ready for assembly

    Direct Indexing Sharpening Fixture-2.jpg

    Above photo shows a side view of the fixture block, note the slots in the 3/4" arbor hole. There is a 5/16' SHCS installed for clamping the arbor after each index

    Direct Indexing Sharpening Fixture-5.jpg

    Above photo shows the indexing pin housing mounted to the fixture

    Direct Indexing Sharpening Fixture-6.jpg

    Above photo shows the arbor installed in the fixture along with the 3/4" N.F. split shaft collar, The threaded split shaft collar is for adjusting all the end play out of the arbor then locking it down with the provided screw.

    Direct Indexing Sharpening Fixture-7.jpg

    Above photo shows the dividing gear installed onto the arbor with the indexing pin in the tooth

    Direct Indexing Sharpening Fixture-11.jpg

    Completely assembled

    Direct Indexing Sharpening Fixture-15.jpg

    On the grinder

    Click here to purchase a set of these plans Direct Indexing Sharpening Fixture Plans
    Last edited by rossbotics; 09-10-2016 at 01:14 PM.
    Comments are always welcome
    Doug



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  2. The Following 8 Users Say Thank You to rossbotics For This Useful Post:

    bvd1940 (12-02-2015), Jon (11-30-2015), kbalch (11-30-2015), Okapi (06-28-2017), Paul Jones (11-30-2015), PJs (12-04-2015), tooly (11-28-2017), Workshopshed (11-30-2015)

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    Paul Jones's Avatar
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    Doug,
    Looks like your will have many uses for this fixture. Nice work. Question: what is the purpose of the threaded section on the arbor?
    Thanks for the posting, Paul

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    rossbotics rossbotics's Avatar
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    Thanks for the compliment Paul.
    The purpose of the threaded area on the arbor is for the threaded split shaft collar, After you insert the arbor in the fixture block you then screw on the collar until there is no end play then lock the split collar down on the thread, that will hold the arbor securely in place.

    Thanks Doug
    Comments are always welcome
    Doug



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    PJs (12-04-2015)

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    Doug,

    Very good design advice using a threaded split collar to remove the end play and so much easier to setup than a pair of lock nuts.

    Thanks, Paul

  7. #5
    Content Editor DIYer's Avatar
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    Thanks rossbotics! We've added your Direct Indexing Sharpening Fixture to our Sharpening category, as well as to your builder page: rossbotics' Homemade Tools. Your receipt:


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    Hi Doug,

    Another very useful tool and very well-explained. Your Direct Indexing Sharpening Fixture is our 'Best Documented Build' for November, 2015!

    You'll be receiving a $35 online gift card from GiftRocket.

    Just send me your email address (via PM) and we'll get things processed directly.

    Congrats!

    Ken

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    steamingbill's Tools
    Hello,

    Very good design advice using a threaded split collar to remove the end play and so much easier to setup than a pair of lock nuts.


    Any chance of a simple diagram or weblink to help me better understand what this means please ? - removing end play sounds like a good thing but I cant viualise the rest of the sentence and how it works.

    Its okay I finally got it - am a bit slow sometimes.

    Bill
    Last edited by steamingbill; 12-03-2015 at 04:50 PM. Reason: Finally understood

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    Hi Doug,

    A very impressive double winner! Your Direct Indexing Sharpening Fixture is also the 'Tool of the Week'!

    As you've already received one of our official HomemadeTools.net T-shirts, we'd be glad to award you a $25 online gift card!

    If you could confirm your email address via PM, we'll get things processed directly. I bet it hasn't changed in the last few days, though, right?

    Congrats!

    Ken

  11. #9
    Jon
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    Great win. The CAD files really strengthen the tool presentation.

    All rossbotics Homemade Tool of the Week wins:

    1. Height and Square Gauge
    2. Filing Machine
    3. Slitting Saw Arbor
    4. Threading Insert Tool Holder
    5. Toolmaker's Vise
    6. Indexing Fixture
    7. Gear Cutter Arbor
    8. Direct Indexing Sharpening Fixture

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    rossbotics (12-01-2017)

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    racer-john's Tools

    Using the surface grinder as a tool grinder by rossbotics

    Cad Dwgs are where?


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