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Discussion Starter · #1 ·
Woodworkers frequently ask the question of how to install a router or shaper bit, to avoid collet-bottom contact. The common answer is to insert a 1/4 or 1/2 inch rubber grommet between the bit shank and the collet bottom. This works great, but when you’re out of grommets, here’s another item that can be used instead.

Cut several tiny pieces of .080 gauge string-trimmer line (or close to a grommet's thickness) with a utility knife. My pieces are all about 3/16", and small enough to fit loosely inside all of my router (and shaper) collets. I drop one piece into the collet, insert the bit and tighten the nut. The one-size piece can be used for 1/4 and 1/2 inch collets and the poly material will not stick to the metal. Worn pieces are easily removed with a pair of tweezers and an ample supply is always available for replacement. I store the cut pieces in an empty gum container for easy access.

- Bob
 

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It also depends on your router, as some have a much longer depth before the cutter touches bottom.

I checked the Triton TRA000 and also the Makita 3612C

The Triton is approx. 27mm from the top of the collet to the shaft and the Makita is approx. 60mm.
 

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Discussion Starter · #3 ·
It also depends on your router, as some have a much longer depth before the cutter touches bottom.

I checked the Triton TRA000 and also the Makita 3612C

The Triton is approx. 27mm from the top of the collet to the shaft and the Makita is approx. 60mm.
Thanks James. I learn something new everyday. I guess us old timers miss out on new tech, when we tend to stick with the vintage power tools!

I'll include a note in a separate post regarding my tip, with the longer depth info that you have relayed.

- Bob
 

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Discussion Starter · #4 ·
Woodworkers frequently ask the question of how to install a router or shaper bit, to avoid collet-bottom contact. The common answer is to insert a 1/4 or 1/2 inch rubber grommet between the bit shank and the collet bottom. This works great, but when you’re out of grommets, here’s another item that can be used instead.

Cut several tiny pieces of .080 gauge string-trimmer line (or close to a grommet's thickness) with a utility knife. My pieces are all about 3/16", and small enough to fit loosely inside all of my router (and shaper) collets. I drop one piece into the collet, insert the bit and tighten the nut. The one-size piece can be used for 1/4 and 1/2 inch collets and the poly material will not stick to the metal. Worn pieces are easily removed with a pair of tweezers and an ample supply is always available for replacement. I store the cut pieces in an empty gum container for easy access.

- Bob
UPDATE: Thanks to James (JW2170) with a reply on usage of grommets, I learned that some of the newer routers have deeper collet chambers. With that said, if the bit doesn't touch the bottom, no grommet is not necessary to prevent bottoming-out.
 
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