Changing Jointer Knives

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Forum topic by Nate1979 posted 08-02-2017 02:38 AM 633 views 0 times favorited 3 replies Add to Favorites Watch
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2 posts in 908 days

08-02-2017 02:38 AM

I am new to woodworking and being a member on this website. It has been helpful even before I was a member when I was starting to learn to do simple projects.

I have a 1940’s boise crane 6 inch jointer that needed the knives changed on. It has the gib screws that are between the wedge and blade that expand to compress the blade in place. They were a booger to get loose but I finally got them out and ordered new blades. When I removed the blades I didn’t make any reference marks to the high point of the knives. I bought a jointer buddy from rockler to set my new blades but the directions show you how to use it with reference lines per the old knives being in place but I don’t have those.

How can I use the new jig when I get the new knives to set them or did I cause myself a lot more work?


3 replies so far

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7599 posts in 2809 days

#1 posted 08-02-2017 02:44 AM

I had the same jointer, and never used a jig and never made any kind of reference marks (or felt the need to)... just used a dial indicator. The manual describes how to do it with a straight edge if you don’t have the indicator.


PS: How were you able to determine the age of the machine? From 1937, there were no noticeable changes I am aware of until around 1949 when the fence angle pre-set arrangement was changed. My 1954 model was fortunate enough to have the date stamped on the bottom of the infeed table.

-- Brad in FL - In Dog I trust... everything else is questionable

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1372 posts in 1105 days

#2 posted 08-02-2017 02:58 AM

easiest way to set straight jointer knives is with a good straight edge. I always used the base from my combination square when I had a straight knife jointer. set the straightedge on the outfield table, spin the head until the knife just barely touches the straight edge. do one side of the blade, then repeat for the other side. Takes some trial and error but with practice you can set knives in about 15 minutes. be sure to recheck after you tighten the wedge bolts, sometimes things will shift.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

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2651 posts in 2408 days

#3 posted 08-02-2017 01:35 PM

No need to be shy about changing knifes. I hate to say this but you tube is a great resource for this.
My recommending would be the stick drag method it’s so easy.
The method I use is a Dial indicator for very precise knife sets.
And the stick drag method that’s fast and easy but not as precise for me.
Good luck, love old jointers.

-- Aj

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