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Shop Notes #2: Spiral bit --Collet loosening

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Blog entry by nakamaruchi posted 01-17-2008 06:21 PM 887 reads 1 time favorited 7 comments Add to Favorites Watch
« Part 1: Making drawers and Bit Loosening Part 2 of Shop Notes series Part 3: Shop improvement and Dust Collection of my bandsaw »

I tried as Gary and Todd said this morning.
I put it in all the way and then back it out just a little bit———- in many ways.

But it wasn’t successful at all. Bit ran up within a several seconds.
Cutting some work pieces, it broke through soon before cutting only a few inches long.

After that, I replaced the collet with another one, but the same thing happened again.
While the router is running freely, nothing is wrong with it.
But once it cuts some wood, it happens again.
It seemed that the up-spiral bit “drills up” by itself because of the frinction of wood or something.

After all I replaced the bit with noromal straight bit, nothing happened again.

I think this case occurs with its spiral shape.
Must I give up the spiral bit or Makita 1101 ?

But I could finally build up all the drawers which is very poor quality for my poor skill before going work, .......though I was almost late.

-- Satoru Nakamaru, Japan ---It takes twenty years to make an overnight success. -- And if my English is strange or incorrect, please tell me.



7 comments so far

View Hawgnutz's profile

Hawgnutz

526 posts in 2733 days


#1 posted 01-17-2008 07:22 PM

Hey, try this… Get one of those little rubber balls inside rails and stiles as spacers fo the panel. Drop it in your collet before you put your bit in, then tighten up the bit—tightly. The spacer balls keep the bit from bottoming out on the collet, and then they won’t make the collet loosen up.

I hope this works. I use them in all my routers.

God Bless,
Hawg

-- Saving barnwood from the scrapyards

View che's profile

che

123 posts in 2682 days


#2 posted 01-17-2008 07:24 PM

This assumes a US spec router with US spec collet.

1. Make sure your bits are in US measurements to match the US spec collet on the router. If the bit is a little small IE 6mm or 12mm The collet may bottom out before fully grasping the bit.
2. Measure the diameter of the router bit with a micrometer or caliper. it should be 1/4” or 1/2” (6.35mm, 12.7mm) Replace the bit if it is small. Not tightening your collet once and having it spin could have removed some material making the shaft too small.
3. Try a new up-cut router bit. (I dobut this is the problem if your measurement above is OK but it is cheaper to try than a new router and there wouldn’t much harm in a second up-cut bit.
4. I would try a new collet although since you have tried two I doubt this is the problem, but again its cheaper than a new router.
5. Last if all else fails replace / repair the router. If the router can’t properly hold an up-cut bit it will eventually fail while holding other profiles and you won’t be able to trust your settings.

-- Che.

View Bob #2's profile

Bob #2

3808 posts in 2678 days


#3 posted 01-17-2008 07:28 PM

I don’t know if you have checked this but the slot on the collet must line up exactly with the slot on the insert or else the insert will not be able to squeeze down on the bit. I often have to line them up witha samll bladed screwdriver to be sure they will close.

Regards
Bob

-- A mind, like a home, is furnished by its owner

View rpmurphy509's profile

rpmurphy509

288 posts in 2511 days


#4 posted 01-17-2008 08:14 PM

Spaceballs are great for routers as Hawgnutz mentions.

-- Still learning everything

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 2956 days


#5 posted 01-17-2008 08:27 PM

Try cleaning your collet, sometimes they get gummed up.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

View Bob #2's profile

Bob #2

3808 posts in 2678 days


#6 posted 01-17-2008 09:05 PM

I just use an “O” ring in the base of the collet. It wont fll out bu accident.

Bob

-- A mind, like a home, is furnished by its owner

View nakamaruchi's profile

nakamaruchi

39 posts in 2471 days


#7 posted 01-24-2008 07:09 PM

Hawg,
Though I read what you worte I can not understand what you want to tell me. But for my poor English perhaps I made you misunderstand what is happening to my router.
The trouble of mine is not bottoming but bit moving outward. —Setting it underneath a router table, upward.
In this case, is rubber ball available ?

Che,
1 I bought all the tools from US, so nothing is wrong. Bit is from Lee Valley, router is from Amazon.
2 Bit size must be exactl 1/4’’ as far as I can see with my caliper. But this must be the most likely. From the begining of my use, the trouble happened. So if the shaft is little small it is defective.

-- Satoru Nakamaru, Japan ---It takes twenty years to make an overnight success. -- And if my English is strange or incorrect, please tell me.

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