I think that is a spiral point tap.
The flute is straight along the length of the tap then the flute is is
ground deeper toward the backside of the cutting edge.
AutomationDirect.com sells some really nice taps for reasonable amounts.
Dave
On 7/9/2021 8:32 PM, John Dammeyer wrote:
The saying we have on another group is if there aren't pictures it didn't
happen. I hand held the camera so depth of field is out a little on the 10-32
screw head and the macro lens is bad for depth of field as it is.
Short G-Code 200 RPM tapping into really soft aluminium trimmed off an old box
or something. Not sure if this classifies as a spiral tip tap but even a
forming tap would have pushing this soft metal around.
http://www.autoartisans.com/mill/SpindleControl/Tapping10-32.jpg
John Dammeyer
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