I need a little help...

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by parkerdude posted 12-14-2009 07:18 PM 964 views 0 times favorited 7 replies Add to Favorites Watch
View parkerdude's profile


182 posts in 3477 days

12-14-2009 07:18 PM

Topic tags/keywords: router question milling

Hey Guys,

I could use a little help…

I have an original Incra jig, and when I try to make box joints, they come out too tight. I can put them together dry but if I apply glue there is no way that the joints go together wet.

How can I gain a little extra clearance, maybe an extra 1/64 or just a few thousandsths?

I actually broke / crushed a small box trying to clamp the joints closed.

Anyone have a solution?


-- dust control

7 replies so far

View Ger21's profile


1074 posts in 3156 days

#1 posted 12-14-2009 08:26 PM

If the joints are the size of the router bit, then try a new bit. Yours may be a little undersize.

If they fit dry, then you can try polyurethane glue. It’ll act like a lubricant and the joints should go together easier. Don’t use too much, or you’ll have a mess to clean up. Epoxy will work too, but is much messier.

-- Gerry,

View Chiefk's profile


163 posts in 3796 days

#2 posted 12-15-2009 04:23 PM

When I bought my incra I was told to buy router bits made for the incra. Many of the router bits brands sell sets of router bits for the incra. I bought mine from Woodline. Perhaps as Gerry said, changing the bit will solve your problem. pkennedy

-- P Kennedy Crossville, TN

View parkerdude's profile


182 posts in 3477 days

#3 posted 12-18-2009 11:55 PM

Hey thanks Ger21, Cheifk, DaveR, I had to remember where my 1” micrometer was and you’re right! My spiral 1/4” bit measured .245”.

I guess I should have measured it first. I have a new / unused 1/4” straight flute bit that measures .252”, I think that will work.

-- dust control

View stefang's profile


15881 posts in 3359 days

#4 posted 12-20-2009 05:21 PM

Water-based glues will swell the joints. You might try polyurethane glue instead. it will not cause swelling. Don’t use too much though (maybe 1/2 as much as water-based) as it expands while drying and you probably don’t want more clean-up work than necessary. It’s great to have a really tight fit as long as you can get it together.

-- Mike, an American living in Norway.

View trimmer's profile


90 posts in 3466 days

#5 posted 12-20-2009 05:48 PM

Why don’t you mount your jig to your tablesaw and use a dato???
Can fine tune your width better.

View Julian's profile


880 posts in 3551 days

#6 posted 12-20-2009 07:56 PM

With an incra you can just dial the account for the difference in diameter with the micrometer dial. I used to do it all the time with mine. I had one about 12 years ago when I first saw them at a woodworking show. The guy doing the demo actually measured the dimension of a dovetail bit then preceded to make perfect fitting joints all thaks to the micrometer dial on the jig.

-- Julian, Park Forest, IL

View parkerdude's profile


182 posts in 3477 days

#7 posted 12-20-2009 08:35 PM

Ha ha Julian,

I guess my age is showing. I bought MY Incra jig around 1987, the only thing that you can turn is the locking knob.

The earlier posts regarding bit diameter seems to be the solution. I was trying to cut 1/4” joints with an undersized bit. I changed bits to one of proper size and re-cut the joints and they came out fine.

Thanks again fellas.


-- dust control

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics