Will be good for small stuff

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Project by stcin posted 02-14-2011 06:13 AM 2634 views 3 times favorited 5 comments Add to Favorites Watch

Liked the looks of the Grrgripper. Did not want to spend $70 to $100. Looked around the shop. Found an old fence rider, an Incra jig that was not being used, a piece of sticky backed rubber, a block of cedar and an 1/8 plywood shim (one too many trips through the planer). Works great and all I spent time was time.

5 comments so far

View steliart's profile


2893 posts in 2930 days

#1 posted 02-14-2011 09:41 AM

very interesting

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of inventions !!!

View Mary Anne's profile

Mary Anne

1058 posts in 3450 days

#2 posted 02-14-2011 03:52 PM

Great use of shop “extras”. This looks possibly be even safer than the Grrripper.

View parkerdude's profile


182 posts in 3693 days

#3 posted 03-14-2011 06:54 AM

Hey stcin…
It looks like you have a couple of those Incra jigs. How old are they? I’ve got one that I bought about 25 years ago. I finally got a chance to set it up. I had a problem with 1/4” finger joints. I forgot to measure the diameter of the bit, it was about .008” undersized and made the joints too tight.

Good luck, it really is a good fixture.


-- dust control

View stcin's profile


29 posts in 2932 days

#4 posted 03-14-2011 08:30 PM

Hi Parkerdude,
I have three of those jigs and probably got the first one twenty-five to thirty years ago. When I bought the first one I was also spending quite a bit of time fly-fishing. The learning curve was too steep for me to want to spend the time with it. Through the years the first jig multiplied through trades and bartering to three. I have one on the small parts jig, one mounted to a miter slider as a precision stop and one on the shelf waiting for inspiration. On the finger-joints, I haven’t cut any in a while but some box projects are on the horizon. Was it that the stock was .008 thicker than the bit diameter? How will you account for the difference next time?

View parkerdude's profile


182 posts in 3693 days

#5 posted 03-14-2011 08:57 PM

Hi stcin,

It wasn’t the stock size but the bit was undersize by about .008”, the incra jig has 1/32” steps and with the bit being undersized each cut was progressively short by the .008”, (eg. .008 1st cut, .016” 2nd cut, .024 3rd cut, and so on). The result was that the joint was too tight. I could barely get one box to come together dry. I crushed that box trying to get the joints to close during glue-up.

My solution was to use a 1/2” shank straight cut .250” bit that actually measured .250”. The problem was a carbide .250” upcut spiral bit that started out as a .250” blank before the flutes were cut, resulting in the undersized final dimension.

The spiral bit made for a MUCH smoother cut, but I’ll have to get one cut from a 1/2” shank blank, so that the finished size will be exactly as advertized.

The Incra is still a great jig. Good luck with your projects!


-- dust control

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