Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)


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Thread: Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

  1. #1
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    Default Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

    Hi,

    I'm trying to cut a 90 degree countersunk hole on an existing 3.1mm hole. The top diameter is set to be 7mm. I'm using a 3/8" spot drill to do the job. I selected the conical shape as the geometry and HSM set the height. However, the top diameter always come out to be about 1mm less than designed. Now I have to make it a 8mm top opening in solidworks to actually get it to 7mm. What did I miss here? Should I define a chamfer tool instead of the spot drill?

    Thx in adv.

    Daz

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  2. #2
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    Default Re: Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

    Are you sure the spot drill is 90° and not 82°?



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    Default Re: Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

    I would ask the same question as TheCamMan. If it is really 90 degrees then just use a drill toolpath and go 3.5mm deep.

    Ben

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    Member Steve Seebold's Avatar
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    Default Re: Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

    There is probably a flat on the bottom of your spot drill. I would measure that flat then draw your spot drill and measure the height of your spot drill from the tip to the diameter you want. Use a G82 drill cycle and put a dwell in the program.

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    Gold Member MichaelHenry's Avatar
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    Default Re: Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

    Wouldn't a spot drill need a point, rather than a flat, tip? I thought they were intended to start holes on flat surfaces, inch case you'd need a point on the end.

    Mike



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Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)

Help - Can't get countersunk hole to the correct size (Tormach + HSMWorks)