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Rope wheel pulley groove form tool

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PekkaNF:
Used some silver steel, face, drill, recess, treepan chip breaker, parting off.

Had to use rotab and tilted it a little for clearance angle. Hardening was normal, I usually use hot air gun to draw temper, bit easier to control than alternative.

Bit holder is key steel stock, pretty much just roughed, drilled and threaded for M4.

Pekka

awemawson:
Nice straw colour on that tempering  :thumbup:

John Stevenson:
I usually drill a dimple into the end of a steel shank then drop a ball bearing in of the right size and braze it all in.

Then just grind 1/2 the ball bearing away, bit like a vertical 'D' bit .
Decent material and no hardening needed.

PekkaNF:
Andrew, aiming harder than blue hues for plastic and other soft material. Hot air gun is easer for me than torch...even after few knife blades.

John, that is good hint for large radius.  I needed here hemsisphere bottom and 45 degree sides. Don't know why but the boatguy insisted. That one does not go boat yet, needs a little tweaking on dimenssions and then 10 pcs more to go.

Pekka

sparky961:
Nice job.  I like the idea of using a heat gun to temper.  I never considered that before.

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