cross threaded Spindle Collet - DW618 - *Solved*
Feb 24, 2019 16:19:09 GMT
Derek the Admin and Bruce like this
Post by petek on Feb 24, 2019 16:19:09 GMT
When changing bits I accidentally cross threaded the threads on the spindle, where there the Collet screws on. The threads were damaged when I put on the collet not*straight-ly, and went right to the wrench instead of cluing in, that I couldn't turn it with my hand anymore when it was just starting putting it on (duh). I tried a bunch of things, but in the end what worked (great) was:
1) remove the spindle from the machine, so you can see what you're doing.
2) buy a metric thread file, with a face that's made for 1.0 pitch thread (1 thread per mm), which matches the dewalt DW618 spindle. (i bet it's the same on the other dewalt too).
3) file the threads using the 1.0 pitch face of the file, ensuring most of the rows of your file's teeth are engaged into the good threads, to use as a guide to recut the damaged threads above. It takes 10 minutes. Blow off the metal dust.
4) inspect, and turn on the collet with your hand (dont need a bit in it for this) - ensure the collet looks straight by watching it and turn the spindle shaft with your hand. If it does look good, use a 22mm socket or wrench and a 19mm wrench to tighten down the collet nut up and down a couple times. Do this until you can turn the collet by hand nearly all the way down before having to use a wrench w/o a bit in it. Next time, pay more attention when changing bits to whether or not you have to use your wrench for the first 90% of the thread engagement.
FYI: the threads are M20x1.0.
RE: a cutting die - thread Cutting dies are very difficult to find locally (at least around where I live), plus they'd be hard to use because you would likely struggle to get it aligned to the spindle since the threads at the end were cross threaded.
1) remove the spindle from the machine, so you can see what you're doing.
2) buy a metric thread file, with a face that's made for 1.0 pitch thread (1 thread per mm), which matches the dewalt DW618 spindle. (i bet it's the same on the other dewalt too).
3) file the threads using the 1.0 pitch face of the file, ensuring most of the rows of your file's teeth are engaged into the good threads, to use as a guide to recut the damaged threads above. It takes 10 minutes. Blow off the metal dust.
4) inspect, and turn on the collet with your hand (dont need a bit in it for this) - ensure the collet looks straight by watching it and turn the spindle shaft with your hand. If it does look good, use a 22mm socket or wrench and a 19mm wrench to tighten down the collet nut up and down a couple times. Do this until you can turn the collet by hand nearly all the way down before having to use a wrench w/o a bit in it. Next time, pay more attention when changing bits to whether or not you have to use your wrench for the first 90% of the thread engagement.
FYI: the threads are M20x1.0.
RE: a cutting die - thread Cutting dies are very difficult to find locally (at least around where I live), plus they'd be hard to use because you would likely struggle to get it aligned to the spindle since the threads at the end were cross threaded.
