The diamond drag tool now in the MPCNC LM3UU holder has appeared in several holders and suffered considerable misuse along the way:
A closer look at the spalled section on the flank:
The tool in the (much better) CNC 3018XL LM6UU holder has engraved mostly plastic, plus a few hard drive platters, and seems only slightly rounded:
An unused tip comes to a neat point:
As does its companion, arriving in a twofer deal from halfway around the planet:
They’re brazed on 3 mm OD shanks and ground to a 60° included angle.
The Smell of Molten Projects in the Morning 
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2 responses to “Diamond Drag Tool Wear”
[…] have no way to measure the actual engraving depth. If the 60° diamond tool had a perfect point, which it definitely doesn’t, then a 0.15 mm wide trench would be 0.13 mm deep. I’ve obviously sanded off some of the […]
[…] The grooves have a flat-ish bottom and side walls roughly matching the slightly worn 60° diamond tool […]