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Thread: Sharp end mills

  1. #1
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    Default Sharp end mills

    I saw this little gem in one of Harold Halls books and thought I would give it a shot. Gotta say it works well and only needs an offhand (bench) grinder with a flat work rest that is height adjustable.
    It is very easy to put both primary and secondary clearances and can also do slotting drills as shown but with a shim placed between the tool holder and the adjusting block to facilitate the uneven cutting edge lengths.

    Phil
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    So Phil,

    I take it that it is an adjustable depth stop and that the tool holding block is hand held against the stop and you require a block for each diameter cutter?

    Looks dead simple.

    BT

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    Default Sharp end mills

    Quote Originally Posted by Anorak Bob View Post
    So Phil,

    I take it that it is an adjustable depth stop and that the tool holding block is hand held against the stop and you require a block for each diameter cutter?

    Looks dead simple.

    BT
    Spot on Bob.
    That's exactly how it works and before you say anything I am going to neaten it up. Give it the Bob treatment you might say.

    Phil

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    Default How does it work

    A lot simpler than a tool and grinder cutter, but how does the block with the spring and plunger interact with the one that holds the end mill?

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    Default Sharp end mills

    The block with the spring and plunger is an adjustable stop so you can gradually feed the tool into the wheel.

    Phil

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    Default

    Hi Phil,
    It is a very simple and elegant way to sharpen the ends of cutters....but i must say it is always the flutes that i blunt before the ends. Does it really need the BT treatment? it has a nice solid "industrial" look as it is.
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

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    Quote Originally Posted by Ueee View Post
    Hi Phil,
    It is a very simple and elegant way to sharpen the ends of cutters....but i must say it is always the flutes that i blunt before the ends. Does it really need the BT treatment? it has a nice solid "industrial" look as it is.
    Hmmm I like the sound of solid "industrial" but Bob has set the standard and at the very least I 'must' try.

    Phil

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    Which book was it Phil looks like a quick and simple fix to my blunt end mills.
    Pete
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    Quote Originally Posted by fxst View Post
    Which book was it Phil looks like a quick and simple fix to my blunt end mills.
    Pete
    Hi Pete,
    I am still struggling to find which book it is in but it is featured in the Model Engineers Workshop number 170. I am confident I have a copy if you can't locate one.

    Phil

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    Quote Originally Posted by Steamwhisperer View Post
    I am still struggling to find which book ....
    The book is Harold Hall's Tool and Cutter Sharpening - page 53.

    Bill

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    I'm looking at page 53 and I reckon Phil's version is an improvement on Hall's. With Hall's, infeed is provided by means of his grinding rest and its integral feed mechanism. Phil's version is far more simple and can be used on a plate attached to a bench grinder's standard rest. I like it very much and have enough knackered end mills and slot drills to warrant lashing out and making my own.

    I might be able to wring some usefulness out of the Hercus T and C grinder after all. A plan is hatching.

    BT
    Last edited by Anorak Bob; 23rd October 2012 at 06:48 PM. Reason: Shabby spelling. usefulness not usefullness. Sorry.

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    Quote Originally Posted by Anorak Bob View Post
    I'm looking at page 53 and I reckon Phil's version is an improvement on Hall's. With Hall's, infeed is provided by means of his grinding rest and its integral feed mechanism. Phil's version is far more simple and can be used on a plate attached to a bench grinder's standard rest. I like it very much and have enough knackered end mills and slot drills to warrant lashing out and making my own.

    I might be able to wring some usefullness out of the Hercus T and C grinder after all. A plan is hatching.

    BT
    HI Bob,
    I found it very easy to use and it does a great job. All I did was work out what angle was created as the table height was raised in reference to the wheel. That way the primary and secondary clearance angles could be set.

    Phil

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    Thanks for the info ...Now I can look for it
    Pete
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    Edward Langley, Artist (1928-1995)

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    Default A Raft of Questions

    Hey Phil,

    Is cross feed involved in the sharpening operation or only "plunge" grinding? If cross movement is a feature of the sharpening process, how are you achieving it?

    And is there anything that you would change about the design?

    Bob.

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    Default Another Idea

    Phil & Bob
    Thanks for the idea of sharpening end mills.
    I think it can be done by holding the end mill in an indexing fixture, mounted on a surface grinder & traversing the end mill past the side of the wheel to a predetermined stop.
    I will give it a try.
    The ideas on this Forum never stop. One idea leads to another.
    regards
    Bruce

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