|Forum topic by GaryK||posted 04-30-2011 03:26 AM||9267 views||30 times favorited||21 replies|
04-30-2011 03:26 AM
Starting out my life as a machinist and evolving into an engineer made the, intimidating for some, task of changing the blades on my jointer fairly straight forward.
I had all the tools I needed to do the job, but I wanted a simple. fast foolproof way to do it.
There are really 2 things you need to do.
1. Find amost top dead center for the blade.
2. Set your new blades 1 to 2 thousands of an inch above the outfeed table.
The first is simple using a a scale
First line up the edge of the outfeed table to an even inch number on your scale. 7 in this example.
Then by hand (unplug it first!) rotate the cutter clockwise so that the blade picks up and moves the scale forward. It moved it about 3/16” in this example.
Then just rotate the cutter back to move the scale almost 1/2 the distance and you will be close to top dead center.
Then just take a piece of wood and wedge it in to keep the cutter head from rotating. This should take all of about 1 minute to complete.
Next step, setting the blade height.
I have seen various magnetic tools for doing this, but here is a way to make you own. I went to a hobby store and bought a package of 10, 1/2” diameter “super magnets” for about $3. I had two pieces of steel of steel laying around so I used them. Aluminum would work as well.
I stuck 3 of the magnets to my jointer table. One spaced further away from the other 2. Then I put a drop of epoxy on each magnet and set my steel bar on it. Once dry those magnets will be perfectly flat on that bar.
Then after removing and installing your new blades (loosely), set the single magnet over the blade while sticking the tool to the table. Put one near each end of the blade making sure you to cover screw that tightens your blade.
Raise the blade up until it sticks to the magnet and tighten it there. You are done with that blade.
Now the reason for not setting the blade while not at top dead center, is so that when you install your new blade it will be just a little bit higher than the outfeed table.
If it’s exactly the same height you will keep “bumping” into it with your stock.
It should take 5 to 10 minutes per blade.
-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX