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Shop Notes #1: Making drawers and Bit Loosening

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Blog entry by nakamaruchi posted 2386 days ago 936 reads 0 times favorited 7 comments Add to Favorites Watch
no previous part Part 1 of Shop Notes series Part 2: Spiral bit --Collet loosening »

I made drawers of my router table. It was very hard for me to duplicate many parts. That’s why I thought I should buy a tablesaw. But somehow, I could make many quasi-the-same-sized-parts with my festool TS55.
The more I use it, the better parts I can make, maybe.

This time I made box joints with my bandsaw to consider a coment from Damian. I could do with it, and its quality was little better than I thought. But it was far from precisive.

By the way, when I use my Makita 1101 with Onsurud upcut spiral bit, it’s collet chuck was loosening and bit came up to crush through a work piece. It was very so dangerous experience that I tighten it very hard.
But 20 minutes after it happened again!
Is this normal ?
Bit loosening is my first experience. I don’t know how to curb it.
Must I replace for a new one ?
Or Onsurud bit is little bit smaller than 1/4 inches ?

-- 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 GaryK's profile

GaryK

10262 posts in 2589 days


#1 posted 2386 days ago

That can happen if you put the bit in the collet all the way. Put it in all the way and then back it out
just a little bit.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View Todd A. Clippinger's profile

Todd A. Clippinger

8717 posts in 2700 days


#2 posted 2386 days ago

I don’t know if there is a difference between European, American, Japanese markets and what they offer. Is there a problem with mixed standards where you are?

I have 2 of the Makita 1101 router kits and I have had good luck with them. I have not had any safety issues with the collet loosening.

I do like GaryK suggests. I place the bit all the way to the bottom and then pull it up a little, then tighten. A good collet and bit should only require tightening to a firm position. It should not require extraneous physical efforts to hold.

-- Todd A. Clippinger, Montana, http://americancraftsmanworkshop.com

View nakamaruchi's profile

nakamaruchi

39 posts in 2416 days


#3 posted 2386 days ago

Gary, Thank you I’ll try. I have never known such a technique.

Todd, My Makita 1101 is imported from US inspite of beeing Japanese maker. 1101 is not sold in Japan.
So what I have must be exactly the same as what you have. I use it in 115V or 125V with up-transformer.

........ and perhaps I must not say “bit loosening” but “collet loosening” ?

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

View GaryK's profile

GaryK

10262 posts in 2589 days


#4 posted 2386 days ago

Nakamaru,

One reason this can happen is because the bit has a slight radius where the shaft meets the
profiled part of the bit.

This radius is necessary to prevent the bit from breaking at that point.
When you put the bit in all the way and tighten it you will tighten in on the radius and not the shaft.
Once the collet slips off the radius it becomes loose and falls out.

So in effect your collet was not tightened on the shaft so it didn’t loosen.

Since you have an “imported” router and Onsrud bits, I would say that the diameter is correct.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View nakamaruchi's profile

nakamaruchi

39 posts in 2416 days


#5 posted 2386 days ago

Gary,

I’ve got it ! What you wrote is little bit difficult but after reading five times, I understood it perfectly.
But watching my bit, I can’t find where the radius is.

Is it too slight to see ?

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

View GaryK's profile

GaryK

10262 posts in 2589 days


#6 posted 2386 days ago

Nakamaru,

I forgot, you were using a straight bit, so the above doesn’t apply. It only applies to bits that have a cutter bigger than the shaft.

It’s my understanding that putting straight bit all the way in creates a different problem. If the bit is bottomed
in the router there can be a combination of things happening. The chamfer on the bottom of the bit might
not be perfect and the bottom of the router where the bit sits might not be centered either. Either or both
would cause it bit to be tightened at a slight angle in the collet or the collet is forced to a slight angle.
In either case as soon as the bit “straightened” it self out it would be loose in the collet.

Let me know how it works for you.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View nakamaruchi's profile

nakamaruchi

39 posts in 2416 days


#7 posted 2383 days ago

Gary and Todd,

Thank you for your great advice.

I posted what I tried and what happened to the next part.

-- 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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