Criterion Boring Head Questions

[RaisedByWolves]

I have an entire drawer in my box at work full of tools that took me hours to make that have only seen minutes of use.

It’s all part of the game.

Had a use for one of those old collected "May never use again" Specialty tools I was referring to.


I needed to make a .040" wide grooving tool to fit a snap ring onto a shaft Im making. Not wanting to start from a new solid tool bit (See where Im going here?) I dug into my boxof someday tools and came up with this.







Its already in the grinding vise and blued as a visual aid here. Its approximately .080 thick at the tip and a little wedge shaped, but as a starting point it probably cut an hour out of the time necessary to make one from new stock.


You can see in this pic the sine vise is angled about 3* and there is a .004 shim under one side of the vise, both to to provide clearance behind the cutting edge/tip.





Finished product took only about a half hour to make and much of that was figuring out the angles via the related math.


Came out good, cant wait to try it. The angle on one side looks wonky (2nd pic), but that's just due to how it was originally ground.