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