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Thread: Sharp end mills
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19th October 2012, 09:12 PM #1SENIOR MEMBER
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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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19th October 2012 09:12 PM # ADSGoogle Adsense Advertisement
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19th October 2012, 10:17 PM #2.
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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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19th October 2012, 10:55 PM #3SENIOR MEMBER
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20th October 2012, 09:43 AM #4Banned
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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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20th October 2012, 02:38 PM #5SENIOR MEMBER
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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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21st October 2012, 08:09 PM #6
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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21st October 2012, 08:29 PM #7SENIOR MEMBER
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23rd October 2012, 12:01 AM #8
Which book was it Phil looks like a quick and simple fix to my blunt end mills.
PeteWhat this country needs are more unemployed politicians.
Edward Langley, Artist (1928-1995)
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23rd October 2012, 07:17 AM #9SENIOR MEMBER
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23rd October 2012, 08:02 AM #10Senior Member
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23rd October 2012, 04:23 PM #11.
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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.
BTLast edited by Anorak Bob; 23rd October 2012 at 06:48 PM. Reason: Shabby spelling. usefulness not usefullness. Sorry.
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23rd October 2012, 06:40 PM #12SENIOR MEMBER
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23rd October 2012, 11:26 PM #13
Thanks for the info ...Now I can look for it
PeteWhat this country needs are more unemployed politicians.
Edward Langley, Artist (1928-1995)
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24th October 2012, 03:55 PM #14.
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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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24th October 2012, 05:40 PM #15GOLD MEMBER
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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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