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Project by Sawdust2 posted 1649 days ago 3273 views 27 times favorited 20 comments Add to Favorites Watch

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

View bigike's profile

bigike

4031 posts in 1923 days


#1 posted 1649 days ago

how did u resaw polycarb? i would have never thought u could. very nice job.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

View mancave's profile

mancave

114 posts in 1699 days


#2 posted 1649 days ago

sweet!

View Routerisstillmyname's profile

Routerisstillmyname

698 posts in 2144 days


#3 posted 1649 days ago

seems faster than my dial jig. THX

-- Router è ancora il mio nome.

View AngelofDeath's profile

AngelofDeath

116 posts in 1711 days


#4 posted 1649 days ago

great idea…..

View Sawdust2's profile

Sawdust2

1467 posts in 2722 days


#5 posted 1649 days ago

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.

View Dave Owen's profile

Dave Owen

234 posts in 1708 days


#6 posted 1649 days ago

Excellent idea, and thanks for the answer to the cutting question asked by bigike.

-- Dave O.

View jm82435's profile

jm82435

1263 posts in 2377 days


#7 posted 1649 days ago

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...

View john200's profile

john200

25 posts in 1684 days


#8 posted 1649 days ago

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

View RexMcKinnon's profile

RexMcKinnon

2593 posts in 1830 days


#9 posted 1649 days ago

Cool jig.

-- If all you have is a hammer, everything looks like a nail!

View Sawdust2's profile

Sawdust2

1467 posts in 2722 days


#10 posted 1649 days ago

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.

View Tribalwind's profile

Tribalwind

69 posts in 1795 days


#11 posted 1649 days ago

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

View SgtSnafu's profile

SgtSnafu

957 posts in 1906 days


#12 posted 1649 days ago

Great jig – Believe I will need to make me one….

Thanks for sharing

-- Scotty - aka... SgtSnafu - Randleman NC

View Karson's profile

Karson

34870 posts in 3035 days


#13 posted 1649 days ago

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. Southern Delaware karson_morrison@bigfoot.com †

View jm82435's profile

jm82435

1263 posts in 2377 days


#14 posted 1648 days ago

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...

View Routerisstillmyname's profile

Routerisstillmyname

698 posts in 2144 days


#15 posted 1643 days ago

Here’s another Variation tutorial.

http://www.finewoodworking.com/ToolGuide/ToolGuideArticle.aspx?id=5294

-- Router è ancora il mio nome.

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