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  1. #1
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,779

    Default Cut an internal keyway

    From time to time I have reason to cut an internal keyway.

    Eventually a job for my shaper but it's still in pieces so I do them on the lathe.

    A slow painful process and not particularly good for the lathe.

    However, this time I pre-drilled a hole which removed about 70% of the material.

    So I needed an 8mm Wide x 4mm deep keyway in a 35mm hole.

    On the mill I drilled a 7.6mm hole at 17.5mm out from the centre.

    Then onto the lathe for boring out the 35mm hole and cutting the keyway.

    The pre-drilled hole reduced the time by about 75%.

    Also, the pre-drilled hole acts as a chip breaker so no need for a run-out groove.

    Much easier!

    Sjmon



    Sent from my SM-G970F using Tapatalk
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  2. #2
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Quote Originally Posted by simonl View Post
    From time to time I have reason to cut an internal keyway.

    Eventually a job for my shaper but it's still in pieces so I do them on the lathe.

    A slow painful process and not particularly good for the lathe.

    However, this time I pre-drilled a hole which removed about 70% of the material.

    So I needed an 8mm Wide x 4mm deep keyway in a 35mm hole.

    On the mill I drilled a 7.6mm hole at 17.5mm out from the centre.

    Then onto the lathe for boring out the 35mm hole and cutting the keyway.

    The pre-drilled hole reduced the time by about 75%.

    Also, the pre-drilled hole acts as a chip breaker so no need for a run-out groove.

    Much easier!

    Sjmon



    Sent from my SM-G970F using Tapatalk
    Hi Simon, this picture has the effect of an optical illusion ! When I first looked at it I couldn't understand why there appeared to be a pin in the bottom of the slot, then suddenly it became a drill hole. Weird.
    Best Regards:
    Baron J.

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