09-02-2013, 12:41 PM
Hi
I know that in the engineering company that I work for some drills are ground to 90 degrees to use for contersinking holes as most countersunk pins are 90 degrees. Most of the countersunk rivets ( pop rivet type) are at 120 degrees and sometimes drills are ground to suit - usually smaller drills up to about 8.00 mm. We sometimes get drawings with different angles for countersinks I have seen 80 degrees asked for but I`m not sure what fasteners are at that angle.
I`m not sure how different the drills are ( other than the angle of course) from a normal 118 - 135 type - maybe Tom could give us some guidlines/video for countersink drills?
Cheers
Paul
I know that in the engineering company that I work for some drills are ground to 90 degrees to use for contersinking holes as most countersunk pins are 90 degrees. Most of the countersunk rivets ( pop rivet type) are at 120 degrees and sometimes drills are ground to suit - usually smaller drills up to about 8.00 mm. We sometimes get drawings with different angles for countersinks I have seen 80 degrees asked for but I`m not sure what fasteners are at that angle.
I`m not sure how different the drills are ( other than the angle of course) from a normal 118 - 135 type - maybe Tom could give us some guidlines/video for countersink drills?
Cheers
Paul
paulmo101, proud to be a member of MetalworkingFun Forum since Jul 2013.