Counterbore as facemill?

[colin hamiltonParticipant @colinhamilton16803]

I bought a joblot of machine tooling and it included these tools. It turns out they are granlund counterbores. I nearly had a heartattack when i saw how much they cost!! They vary in size up to 50mm. I'm never going to need a counterbore anywhere near that big so was wondering if I could use the larger ones as facemills or given the price of them better to sell them on.

Cheers Colin

Edited By colin hamilton on 25/08/2023 19:48:21

[colin hamiltonParticipant @colinhamilton16803]

[Thor 🇳🇴Participant @thor]

Hi Colin,

Nice find, why not try one of the larger counterbores and see how it works as a face-mill.

Thor

[John HaineParticipant @johnhaine32865]

Its teeth will probably not have side clearance so not operate very effectively as a face mill. As Thor suggests, give it a try? Nothing to lose.

[colin hamiltonParticipant @colinhamilton16803]

Posted by Thor 🇳🇴 on 26/08/2023 07:13:22:

Hi Colin,

Nice find, why not try one of the larger counterbores and see how it works as a face-mill.

Thor

Thanks. I will do but given how much they cost I wanted to check I won't just trash them

[Michael GilliganParticipant @michaelgilligan61133]

Posted by colin hamilton on 26/08/2023 07:46:09:

.

Thanks. I will do but given how much they cost I wanted to check I won't just trash them

.

I ‘second’ your caution … Counterbores are specifically designed for plunge-cuts

The use of a Rolls Royce as a chicken-coop springs to mind !

Try offering one for sale … the result should ‘inform your decision’

MichaelG.

[colin hamiltonParticipant @colinhamilton16803]

I reckon I'm just going to find some projects that need a whole load of various counterbores

[old martParticipant @oldmart]

I think you should select the sizes that would be most useful and keep them, sell the rest.

[Author]

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