8mm collet adapter vs 8mm collet - Router Forums
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post #1 of 23 (permalink) Old 11-03-2010, 06:21 PM Thread Starter
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Default 8mm collet adapter vs 8mm collet

I recently purchased some 8mm dovetail bits and it came with an 8mm collet adapter. My question is should I purchase a dedicated 8mm collet or will the adapter suffice as these are the only 8mm bits I own. My concern is can the adapter damage my 1/2 collet?
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post #2 of 23 (permalink) Old 11-03-2010, 08:24 PM
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Hi Todd,

If the adapter is made by a reputable manufacturer for a 1/2" collet, there should be no problems.

I know a number of members use 8mm and 1/4" adapters in their 1/2" collets.

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post #3 of 23 (permalink) Old 11-03-2010, 08:27 PM
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Hi Todd

The adapter will Not damage the 1/2" collet... (8mm = 5/16" shank router bits)

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Originally Posted by toddpolo14 View Post
I recently purchased some 8mm dovetail bits and it came with an 8mm collet adapter. My question is should I purchase a dedicated 8mm collet or will the adapter suffice as these are the only 8mm bits I own. My concern is can the adapter damage my 1/2 collet?



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post #4 of 23 (permalink) Old 11-04-2010, 03:07 AM
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Hi Todd

The adaptor is unlikely to damage anything, but bear in mind that the grip will be slightly less than that of a dedicated collet, so avoid heavy cuts.

Cheers

Peter
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post #5 of 23 (permalink) Old 11-04-2010, 04:07 PM
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Personally I'd only use a collet adaptor as a last resort. As Peter says they grip quite a bit less strongly than a correctly sized collet which means that on medium to heavy cuts you can experience bit slippage, so sometimes the bit will move up or down in the collet. As I'm generally routing as part of my living that's obviously a complete no-no.
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post #6 of 23 (permalink) Old 11-04-2010, 04:46 PM Thread Starter
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Thank you everyone for your expertise. I think based upon the feedback I will purchase the additional collet due to potential slippage.
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post #7 of 23 (permalink) Old 11-04-2010, 05:07 PM
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Just my 2 cents

Some of the funny routers are setup to use the 8mm shank router bits, the ones over the pond the norm..some of the router bit sets are made just for the 8mm bits ,like the one below, I'm sure if they would damage your router they would not sale the adaptors.

As far as "slippage" I don't think so, they make many types of "adaptors" the best ones are the ones with the 3 or 4 slots in them and they do hold the router bits in tight..

This dovetail set below includes all the router bits needed to use for Leigh D4, D4R and D1600 Jig to make drawers, chests, or any other project.

16 pc 8mm Shank Dovetail Router Bit Set For Leigh Jig - eBay (item 140474120341 end time Nov-10-10 22:19:26 PST)

http://www.mlcswoodworking.com/shops..._bearings.html

http://www.leighjigs.com/cutters-d4.php

Just a bottom note,,,Out of many,many routers I have not one of them is setup to take on the 8mm (5/16") shank router bits..and I would be hard press to find them for sale in the states..

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Last edited by bobj3; 11-04-2010 at 05:31 PM.
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post #8 of 23 (permalink) Old 11-04-2010, 10:01 PM
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Bob is right. A decent adapter won't slip. Besides, you could just tighten it a little more than usual and it will be fine.

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post #9 of 23 (permalink) Old 11-04-2010, 10:43 PM
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Hi Todd - If it really bothers you, you probably get collets for your Freud's fairly easily, possibly for the Bosch and Ryobi.

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post #10 of 23 (permalink) Old 11-05-2010, 03:49 PM
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I have the same 8mm set from George, with the adaptors, although being this side of the pond, I'm using 8mm collets and not the adaptors.

A dedicated collet has either 3 or 4 independent fingers depending on the make, which enable maximum gripping power.

The adaptor has three slits, only one of which goes all the way through. (If they all went right through, the thing would fall apart). It therefore fits only where it touches and when tightened, is limited in its movement by two of the slits being only partial and thus attached to their neighbour and moving in tandem, not independently. It relies on the inner circumference reducing as it tightens. However, the inner circumference of the individual segments remains constant and any change is a bend at the point of the partial slits, which is not optimal. The grip will even vary depending on where on the adaptor the collet fingers are pressing.
Mostly it will work, until the day the cut is a bit heavier, or the feed rate a bit faster, when the reduced grip will allow the bit to move when a dedicated collet would have held it.

I must admit that I don't know why this particular 8mm set is being offered by George for a primarily US market, although I was glad to get mine. I only wish he'd offer more 8mm shank stuff ,as he is far cheaper than anything otherwise available over here. There are times when something more rigid than 1/4" but not as big as 1/2" is handy, particularly if I don't want to use the bigger routers.

Cheers

Peter
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