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keeping bit from rising

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Forum topic by tommyd posted 1450 days ago 1088 views 0 times favorited 4 replies Add to Favorites Watch
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tommyd

77 posts in 1731 days


1450 days ago

I need some advice on how to keep my router bit from rising when I am cutting. I am trying to cut a dove tail down the middle of a board and than down the sides of another so I can join 2 long pieces together. On the board that i,m cutting down the middle I have cut most of the wood out on the saw so there is room for the chips. I am using a 1/2 shaft in my router in a table. when making the cuts the bit seems to rise up about 1/16” how or what do I use to keep bit from rising?

-- Life is too short for negative drama & petty things. So laugh insanely, love truly and forgive quickly!  http://tomswoodshop.etsy.com


4 replies so far

View Mark Shymanski's profile

Mark Shymanski

4985 posts in 2311 days


#1 posted 1450 days ago

When you put your bit in the collet is it bottomed out or is there a wee bit of space between the bit and the bottom of the collet. My understanding is that if you bottom out the bit the collet cannot effectively squeeze the shaft and thus will actually be loose especially under load. I think it was here where I learned that you must leave a bit of a gap for the collet to tighten correctly. I believe one of my Lee Valley bits actually comes with instructions for adding an O-ring to the bit shaft to guide you from inserting the bit in too deep.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View BertFlores58's profile

BertFlores58

1644 posts in 1521 days


#2 posted 1449 days ago

Two things to do and check:
1. Check all the slots of the collet or 1/2 drive screw itself if free from any obstruction to be squezzed. Some occasion, i pass a hacksaw blade to be sure if its free. Even you tight hard the nuts, the collets does not squeze and hold the bits firmly because of the obstruction.
2. Check the diameter of the bits. 1/4” collet cannot be used with 6.0 mm bits. It will be loose 0.3 mm because 1/4”=6.325mm. If the router bit has already deter or been worn-out so it should be replace. It work sometime to rough the bit shank by chiselling it and make it coarse.

On general check, take a new bit and use it.. If it is the same, then the collet or the drive shaft is blocked to hold the bit… then do no. 1 above. If it holds steady with the new bit, then the subject bit that was rising is already worn out then do no. 2.

Hope this will help.

By the way, there is no effect whether collet will be reversed. It works on both ways upside down or up. Please note. there is a spring on the bottom part of the drive shaft to help easier way for taking out the bits.

-- Bert

View Gene Howe's profile

Gene Howe

5399 posts in 2027 days


#3 posted 1449 days ago

I wish I could help. I have the same problem…..with one bit, only! I miced it and it’s right on.
Very frustrating.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Gregn's profile

Gregn

1642 posts in 1582 days


#4 posted 1449 days ago

I confer with Mark and Bert on their advice. If you are still having problems get different collet. I went through this and got a different collet and had no problems. The old one looked perfectly fine but found out it was a tad bigger than the new one.

-- I don't make mistakes, I have great learning lessons, Greg

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