This that I saw on the net reminds me - Router Forums
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post #1 of 22 (permalink) Old 01-29-2020, 01:17 AM Thread Starter
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Default This that I saw on the net reminds me

of a thread that I posted some time ago and is worth repeating.

https://www.routerforums.com/attachm...ed-members.pdf

This goes with the photo from the net:

Use rubber O-rings to help you position router bit shafts the right depth in the collet. Use 5/32-in. dia. O-rings for 1/4-in. shafts, and 3/8-in. dia. for 1/2-in. shafts. O-rings prevent two problems: 1. “Bottoming” the bit’s shaft in the collet where it can vibrate and loosen when the router is running. 2. Tightening the collet around the slightly tapered flange where the shaft enters some bits, creating the possibility that the bit might loosen when the router’s turned on. Measure the depth of your router’s collet and position the O-ring on the shaft 1/8 in. less than this depth.
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post #2 of 22 (permalink) Old 01-29-2020, 02:20 AM
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Huh , I thought you were supposed to put a tiny o ring inside the collet so that the bit doesn’t bottom out , there by compensating for a possible change in length from it heating up or something or other ?

I’m going to talk to Cricket and get my user name changed to Dazed & Confused

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post #3 of 22 (permalink) Old 01-29-2020, 03:20 AM
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Either way would keep the bit from bottoming out but the o ring method tells you when you have just enough of the bit in the collet to insure that you have maximum holding power on it. That will give you some extra working height on the bit that using a grommet might not. Unless you filled the cavity below the collet right up to the bottom of the collet with rubber grommets.
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post #4 of 22 (permalink) Old 01-29-2020, 06:39 AM
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Dazed and Confused,

I posted the trick of using O rings like that because I use routers mounted above the table on my manual and CNC mills.

For the really short bits it gives me a simple reference to make sure I have enough for the collet to bite on, but still have ample length to cut with.

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post #5 of 22 (permalink) Old 01-29-2020, 07:03 AM
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O rings move..
wear out..
get lost..
need replacement..
go KISS/MISS... (Keep It Super Simple/Make It Super Simple)
Mark the shanks...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

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post #6 of 22 (permalink) Old 01-29-2020, 08:39 AM
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Quote:
Originally Posted by Stick486 View Post
O rings move..
wear out..
get lost..
need replacement..
.[/URL][/U][/I][/B]
agreed!

"mark the shanks" ??? with?? magic marker will be removed when you clean the bit--- you do clean your bit fellow members--right??
Scratch line is damn near impossible to see under the table in dim light and old eyes. So that leaves???


Putting a TIGHT fitting grommet into the base of the collet allows for compression and proper insertion of the bit. Open the nut. Just drop it in. Tighten the nut, it's done. If you need a "belt & suspenders" approach then also put an o-ring on the shaft.

Personally I don't use o-rings. I find that the are too flimsy & too loose on the shaft. A grommet is thicker, tighter, and only once has moved a tiny bit on the shaft.

If you need more length get a different bit or a "Muscle Chuck" like extender.

YMMV
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post #7 of 22 (permalink) Old 01-29-2020, 09:01 AM Thread Starter
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Quote:
Originally Posted by Stick486 View Post
O rings move..
wear out..
get lost..
need replacement..
go KISS/MISS... (Keep It Super Simple/Make It Super Simple)
Mark the shanks...
After about 15 years a few of mine do need replacement, but is that a BIG deal considering the benefits of the O rings? I guess that you find the glass half empty rather than half full!

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post #8 of 22 (permalink) Old 01-29-2020, 09:39 AM
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So here's how I use the O-rings....

On the manual mill I use 'big' bits. A 2 inch cove bit or an 1 -1/2 inch surface planing bit are not uncommon. Trying to hold these exactly where I want them and use 2 wrenches to tighten the bit isn't always the easiest. If I put the O-ring on there, it gives me a positive stop so I don't have to look at where I'm at, and I can tighten the bit easily.

On the CNC mill, when I was using the original Hitachi collets, they are difficult to sight because the face of the collet is below the nut. Putting the O-rings on makes it easy to just lift the O-ring up until it touches, then tighten the collet. With the Muscle chuck it's even easier.

Can the O-rings move? yes. Do they move easily? not at all. If they move a tiny bit is it a big deal? no.

When inserting bits up from below it's the best technique I have found.
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post #9 of 22 (permalink) Old 01-29-2020, 10:38 AM
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Quote:
Originally Posted by harrysin View Post
After about 15 years a few of mine do need replacement, but is that a BIG deal considering the benefits of the O rings? I guess that you find the glass half empty rather than half full!
I find that using a container sized to the need is the better way to go...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #10 of 22 (permalink) Old 01-29-2020, 10:49 AM
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Quote:
Originally Posted by smitty10101 View Post
agreed!

"mark the shanks" ??? with?? magic marker will be removed when you clean the bit--- you do clean your bit fellow members--right??
Scratch line is damn near impossible to see under the table in dim light and old eyes. So that leaves???


Putting a TIGHT fitting grommet into the base of the collet allows for compression and proper insertion of the bit. Open the nut. Just drop it in. Tighten the nut, it's done. If you need a "belt & suspenders" approach then also put an o-ring on the shaft.

Personally I don't use o-rings. I find that the are too flimsy & too loose on the shaft. A grommet is thicker, tighter, and only once has moved a tiny bit on the shaft.

If you need more length get a different bit or a "Muscle Chuck" like extender.

YMMV
go to the link...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
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