What’s this for…no.5?

[beeza650Participant @beeza650]

Another custom tool. Surely not for grinding again 🙂 ????

[Michael GilliganParticipant @michaelgilligan61133]

Surely is

… or maybe a fixture for checking components that have been ground

MichaelG.

[Robert Atkinson 2Participant @robertatkinson2]

A pair of centers on a sine bar. So most likely to be for grinding or measuring tapers.
By putting a slip gauge under one of the round bars you can set an exact angle based on the sine of the distance beween the two round bars and the thickness of the slip.

Robert.

[Tony Pratt 1Participant @tonypratt1]

You have some quality kit in your collection! I’ve never seen one of these in the flesh, off the top of my head you could check morse tapers etc without the need of a gauge, super!

Tony

[Phil PParticipant @philp]

You should find that the distance between the round supports is exactly 10″…….That makes the sine calculations easy.

[Robert Atkinson 2]

On Robert Atkinson 2 Said:

A pair of centers on a sine bar. So most likely to be for grinding or measuring tapers.
By putting a slip gauge under one of the round bars you can set an exact angle based on the sine of the distance beween the two round bars and the thickness of the slip.

Robert.

I think Robert has got this one exactly right.

Andy.

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