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Machining funnel shaped counterbore in ductile iron

Machining funnel shaped counterbore in ductile iron

Machining funnel shaped counterbore in ductile iron

(OP)
For a 12 mm diameter hole in a ductile iron part, I need to machine a funnel shaped counterbore (inverted frustrum of a cone). The entry diamter is 24 to a depth of 3mm then there is 45 degree taper for further depth of 3 mm. As can be calculated, The outer diameter of the flat land is 24 - (2 x 3) = 18. The inner dia is the hole dia i.e. 12 mm.
The two fillets created have 0.5 mm radius.

Can you please give me some ideas on how I can have this machined on volume basis.

Thanks for your help !



RE: Machining funnel shaped counterbore in ductile iron

Are you saying that the cone is a 45 deg. one?  Couldn't you just use an ordinary metric countersink bit?

Don
Kansas City

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