End mill sharpening

[Howard LewisParticipant @howardlewis46836]

Nigel,

That is a good idea.

Thank You

Howard

[old martParticipant @oldmart]

I have bought small job lots of used solid carbide endmills on ebay and have been pleased with the sharpness. They probably are swapped out from CNC mills after a fixed time as a precaution rather than waiting for failure. I have also bought resharpened solid carbide endmills which may not be the original diameter and may have rads put on at the ends, neither of which shortcomings worry me at all, and they are recoated and sharp at good prices.

Not being able to sharpen any type of endmills, the HSS ones are kept for aluminium and bronze, not steel.

[Nigel Graham 2Participant @nigelgraham2]

Thankyou for explaining it.

The Kennet is simple but that’s its problem – a bit too simple! You have to take the tool-holder block off to index it.

I’ve always been a wary of using an ER collet on a grinder. How do you avoid grit penetrating it and the collet chuck?

 

[petro1headParticipant @petro1head]

Out of interest, where a people buying end mills now

[Howard LewisParticipant @howardlewis46836]

NG2

On the Worden, another simple machine, the grit is driven downwards by the rotation of the wheel, and, so far, have not had any problem with grit entering the ER 20 collets.

I added a screen to mine to keep any grit away from the sliding bars and the adjusting eccentrics, so nearly all the grit stays near to the wheel, which males cleaning easier.

Now a job on the Round Tuit will be to make tool holder with equilateral 1″ triangular sides, in case I ever wish to sharpen three flute end mills.

Howard

[petro1head]

On petro1head Said:

Out of interest, where a people buying end mills now

See the recent thread “source of milling cutters after ARC” or something like that.

[Nigel Graham 2Participant @nigelgraham2]

Thankyou Howard.

It puzzled me for a while how to make a triangular (square or any polygonal) prism concentric with its bore, till I twigged you make it from round of circumscribing diameter, bore it through, then mount it on a mandrel between a suitable divider/ rotary-table and tailstock to mill the flats.

[Andy BrocklehurstParticipant @andybrocklehurst85292]

I sent a couple of 12mm end mills away to be reground / sharpened in all honesty by the time you’ve paid for the job and postage both ways it’s not much different to buy new ones. Probably worth it if you’ve got something like 16 / 18/ 20mm end mills.

[petro1headParticipant @petro1head]

Update

 

excellent service from Raynor Tools, highly recommended

[Author]

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