Project by Sawdust2 | posted 02-23-2010 05:59 AM | 4578 views | 27 times favorited | 20 comments | ![]() |
![]() |
on rare earth magnets. I think 10 for $8. So a friend bought a pack.
You see, last week we changed out the knives on my jointer but we only used a straight edge to align the knives.
Not very precise. And as I have two friends who are pretty anal about precision it was not good enough.
I had some spare polycarbonate pieces.
We resawed a few 3/8 pieces off the slab and then drilled 1/2” holes just deep enough to recess the magnets. Three on the end that would hold the knives and two on the end that would stay on the outfeed table.
When we changed the knives last week it made for a square, even cut but we knew we were just a smidge off on uniformity.
After we made these jigs we put the knife at top dead center, loosened the bolts and the knife just jumped to the magnets. The piece is narrow enough that we could then tighten the two outside bolts in place and then remove the jig and tighten the two inside bolts. Did that three times. Now when I flatten a board it is not only square it is as smooth as a baby’s butt. I’ve never had the blades that uniform before even using the expensive blade guides.
Rare earth magnets $8.00
Polycarbonate scrap FREE
2 knife setting jigs.
Can’t hardly beat that!
Lee
-- No piece is cut too short. It was meant for a smaller project.
20 comments so far
bigike
home | projects | blog
4059 posts in 4741 days
#1 posted 02-23-2010 06:18 AM
how did u resaw polycarb? i would have never thought u could. very nice job.
-- Ike, Big Daddies Woodshop, http://[email protected]
mancave
home | projects | blog
114 posts in 4516 days
#2 posted 02-23-2010 06:18 AM
sweet!
Routerisstillmyname
home | projects | blog
763 posts in 4961 days
#3 posted 02-23-2010 06:29 AM
seems faster than my dial jig. THX
-- Router è ancora il mio nome.
AngelofDeath
home | projects | blog
116 posts in 4528 days
#4 posted 02-23-2010 06:30 AM
great idea…..
Sawdust2
home | projects | blog
1466 posts in 5540 days
#5 posted 02-23-2010 01:52 PM
This is scrap from a company that puts up those thick bullet proof shields you see in banks and check cashing stores. I used a 1/2” 3TPI blade from Morse.
It cuts just like wood because you are feeding it slow.
You could use plexi but I guess it would have to be a little thicker. This does not bend at all.
The larger hole is to hang it on the wall.
-- No piece is cut too short. It was meant for a smaller project.
Dave Owen
home | projects | blog
254 posts in 4526 days
#6 posted 02-23-2010 05:47 PM
Excellent idea, and thanks for the answer to the cutting question asked by bigike.
-- Dave O.
jm82435
home | projects | blog
1286 posts in 5194 days
#7 posted 02-23-2010 06:04 PM
Sweet “jointer pal”. Do the knives touch the magnets, or do they rest on the polycarbonate?
Hmmm, Now all I need is to find a company giving away free polycarbonate…
Oh, I suppose I could use something else…
-- A thing of beauty is a joy forever...
john200
home | projects | blog
26 posts in 4502 days
#8 posted 02-23-2010 06:06 PM
Great and inexpensive idea. A lot cheaper than my Adjust-O magnet squares I purchased from CyberWeld.
If only your idea would have come a couple of months earlier.
Thanks,
John
-- John200, Vancouver, WA
RexMcKinnon
home | projects | blog
2593 posts in 4648 days
#9 posted 02-23-2010 06:14 PM
Cool jig.
-- If all you have is a hammer, everything looks like a nail!
Sawdust2
home | projects | blog
1466 posts in 5540 days
#10 posted 02-23-2010 06:30 PM
We set the magnets just a skosh (RCH) deeper than the poly. We also drilled center holes all the way through. Putting a 1/2” magnet in a 1/2” hole is really a tight fit so we figured the air would need to escape. And if it was the other way around, a little loose, there would have been room for the glue to escape.
Your finger can just tell that there is a gap.
We knew the poly was uniform across its width. That way the blade is guaranteed to be level. The magnets are strong enough.
Glad you like it.
Lee
-- No piece is cut too short. It was meant for a smaller project.
Tribalwind
home | projects | blog
69 posts in 4613 days
#11 posted 02-23-2010 06:58 PM
thanks for posting this, i need to remake mine!
i saw this trick in wood or woodsmith mag a while ago so got a few magnets at radioshak .
those junky things BARELY held up a frikkin paper-clip! literally.
harbor freight’s got 10 RE mags for $2 . 5/16x1/8
the RE magnets are real handy for jigs n things anyway,good thing to keep a bunch on hand.
also found 1/2”x1/8” (same as rockler) on ebay, 50-pack for $13 .
-- Matthew,Long island ny. www.tribalwind.com
SgtSnafu
home | projects | blog
960 posts in 4724 days
#12 posted 02-23-2010 08:05 PM
Great jig – Believe I will need to make me one….
Thanks for sharing
-- Scotty - aka... SgtSnafu - Randleman NC
Karson
home | projects | blog
35300 posts in 5853 days
#13 posted 02-23-2010 08:39 PM
Lee: Great project.
Nice looking jig.
-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Appomattox Virginia [email protected] †
jm82435
home | projects | blog
1286 posts in 5194 days
#14 posted 02-24-2010 06:34 PM
If you are like me you have probably scavenged a few old hard drives for magnets like this:
http://lumberjocks.com/projects/22266
they are ridiculously strong so be careful…
-- A thing of beauty is a joy forever...
Routerisstillmyname
home | projects | blog
763 posts in 4961 days
#15 posted 03-02-2010 12:40 AM
Here’s another Variation tutorial.
http://www.finewoodworking.com/ToolGuide/ToolGuideArticle.aspx?id=5294
-- Router è ancora il mio nome.
View all comments »
showing 1 through 15 of 20 comments
Have your say...