Pictures show before and after.I've been living with a bit of thread damage that I didn't get ahead of on my spindle thread and one fateful evening fueled by a bit too much coffee I tightened my ER25 collet nut a wee bit too tight on a warm spindle. When I came back to do a toolchange, the collet nut had cooled but the spindle threads retained enough heat that an enthusiastic attempt to loosen the nut around the slightly heat-expanded spindle threads deformed the collet nut and then dragged the deformation across all of the threads, severely damaging an irreplaceable component of the spindle.Faced with a 4-6 week lead time for a new $400 spindle from China or a 1-2 week lead on a $1000 domestic replacement, I decided to attempt to rethread the spindle with this $40 die that arrived within two days.2 excruciatingly stressful hours of mashing through my threads and a can of WD-40 later, my spindle is in fighting shape again with no concerning vibrations. I chucked in a 1/4 tool blank and there is no wobble whatsoever. The crests are still damaged but the roots are very crisp and clean.
Rating:
[5 of 5 Stars!]