O-Rings for router bit placement in the collet

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Forum topic by Desert_Woodworker posted 10-15-2016 06:48 PM 660 views 0 times favorited 2 replies Add to Favorites Watch
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1624 posts in 1391 days

10-15-2016 06:48 PM

Topic tags/keywords: router cnc router collets tip question trick

I use routers/spindles and I have to manually place the bit correctly in the collet. Regardless, whether the machine is on the top or the bottom – I have to make sure that it is correctly set just right. The problem sometimes, is that the placement of the bit moves in the collet. Recently, I heard about O-rings used for proper placement of the bit. Here is a video that shows how it is done as he says in the vid- remove the O-ring after machining so that it does not “lock” in the collet. I would like to hear more about this method and share some feedback to me and others.

-- Desert_Woodworker

2 replies so far

View Fred Hargis's profile

Fred Hargis

5143 posts in 2670 days

#1 posted 10-15-2016 07:01 PM

I do it all the time, at least with some bits. I leave the o ring on the bit and have no idea (I didn’t watch the video) what he means about “lock” in the collet. The o rings do stretch (I guess) over time so they need replacing periodically. I grabbed a handful at the hardware store, but they are available from some of the specialty woodworking vendors. I don’t see them as a precision placement device, if that’s what you want. More of a handy way to hold them in roughly the right place while you tighten the collet.

-- Our village hasn't lost it's idiot, he was elected to congress.

View TheDane's profile


5535 posts in 3840 days

#2 posted 10-15-2016 07:05 PM

While I see what he is trying to do, I really think it is more of a solution in search of a problem than vice-versa.

While the o-ring will provide a cushion between the end of the shank and the bottom of the collet, my gut tells me you would either be chasing o-rings around the shop, or digging them out should the router get hot enough to melt them.

I am not into CNC work, so I am not dealing with a spindle that is fixed above the work surface. In a conventional router table, raising the bit a 1/16th has never been an issue for me.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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