How to measure countersink angles of countersunk holes in sheet metal panels

Jim Wynne

Staff member
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#21
RCW Had posted

Originally Posted by RCW


Finally, most of the nonconforming countersunk holes I have seen here have been made using a drilling countersink process, as opposed to stamping. The operator pushed the countersink through too far. The angle is correct but the outer diameter of the countersink is too large.

OUr process is both punch and drill.
This is my curent problem our counter sink and diameter are to print but the thru hole is over. If we control the thru hole our counter sink is under size. Specialy when dealing with thin material.
Is there a standard or a BAC spec that allows this for over size thru hole.

The shops i have worked at for some reason have and under standing that it is allowed because of the material thikness. But i need it documented to justify it.

:thanx:
There is no standard I know of that allows for design errors, and that's what this condition is. Designers specify a thru-hole size and a countersink depth apparently without understanding that if the c'sink is made to the correct depth, the hole will open up. This needs to be accounted for on the drawing. In most cases it means that the hole diameter size/tolerance needs to be increased.
 
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