Internal Chamfer

[Martyn Nutland 1Participant @martynnutland1]

Hello All

I'm progressing the cardan block I was telling you about a week or so ago. At the moment in aluminium so I can make sure I can perform all the procedures in a logical sequence. But I was wondering if you would be good enough to advise on one operarion.

I need an internal chamfer (bell-mouth if you like) at the shaft end of the 38mm diameter through hole. Rather obviously, this is because the block is secure on the front of the torque tube and needs clearance to move up and down on the cardan shaft (running more or less level and solid from the gearbox) as the axle itself rides up and down.

The chamfer needs to be about 45° and extend into the through hole about 10mm. I don't want to spend an arm and a leg(!) and wonder if I hold the workpiece on the mill on my rotary table and rotate it against a 45° chamfer mill running in the spindle, will that work? And is it a realistic approach?

One liners (hopefully polite) perfectly acceptable!

Best as ever from a suuny sprintime morning in Paris and very many thanks and good wishes in advance.

Martyn

[Martyn Nutland 1Participant @martynnutland1]

How to most simply

[JasonBModerator @jasonb]

Did you bore it on the lathe? if so just set the topslide to 45deg and use the same boring bar.

[Martin ConnellyParticipant @martinconnelly55370]

The cut face will be 14.14mm long so it may need two passes at different depths with the tool to achieve it if your mill is not very powerful or rigid otherwise it should work. Do be careful to conventionally mill rather than climb mill. The table goes in the opposite directions for this compared to an outside edge operation.

Martin C

[Martyn Nutland 1Participant @martynnutland1]

Jason

I did. And penetrate 10mm – or so.

Martin

Thanks for the point on directions. Will take on board if I go that way.

Martyn

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