Tool Wear: Here is what a tap looks like after 863 holes

It can be hard to understand how your tools are wearing until you’ve been staring at them for years.

Here is a Balax roll tap after 863 holes in 1018 steel. Tapped on a Citizen screw machine using mineral based cutting oil.

Cut parameters:

Top speed 1600 rpm (3000
.345″ depth

 

Here is what a tap looks like after 863 holes

Here is what a tap looks like after 863 holes

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