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+-- Thread: Wrong size jointer knives (/showthread.php?tid=7368502)
Wrong size jointer knives - jeffss - 04-05-2022
I'm replacing knives on a older Powermatic model 60. The new blades are 1/8" shorter. They fit in the head ok but I will have to lower the outfeed side. Lowering it will also move it slightly away from the cutters. Will this be a problem? thanks
RE: Wrong size jointer knives - fredhargis - 04-05-2022
Lowering the outfeed table shouldn't be a problem.
RE: Wrong size jointer knives - Woodenfish - 04-05-2022
The only problem might be resharpening.
RE: Wrong size jointer knives - ajkoontz - 04-05-2022
Shorter how? Like they are 7-7/8” long not 8” or like 1/2” wide instead of 5/8”? I don’t see how length would affect the outfeed height so I assume you are talking about width. How are you setting your blades? I assume you had to lower the blades so the cutterhead screws made full contact? I’m used to setting them to the height of the I feed table so making sure I understand your question. Setting from the I feed side I sometimes have to make a slight outfeed adjustment and this is normal. But if you had to lower your knives in the cutterhead then you might have to make a significant outfeed adjustment. If so, this shouldn’t be a problem. Your scale might be off (if you even use it) is the only thing I can think would change.
RE: Wrong size jointer knives - jeffss - 04-05-2022
Should have been more clear. Old blade is 8"x7/8"x1/8". New blade is 8"x3/4"x1/8".
RE: Wrong size jointer knives - fredhargis - 04-06-2022
Doesn't that jointer have jack screws to raise the knives up?
RE: Wrong size jointer knives - Bob Vaughan - 04-06-2022
(04-05-2022, 09:02 PM)jeffss Wrote: Should have been more clear. Old blade is 8"x7/8"x1/8". New blade is 8"x3/4"x1/8".
That's pretty much the way our world is these days if you're stuck with off-the-shelf knives. Actually 13/16" is about the best width for those cutterheads. Both the 6" and 8" jointers of that era used the same cutterhead dimensions other than length. Even starting out with 3/4" wide knives, you've still got some room for a few more re-sharpenings.
Consider having the old knives sharpened. Chances are what's available today that the sellers call "High Speed Steel" won't be hardened and tempered like the original blades.
I Have even put in 5/32" thick knives in that cutterhead with no ill effects. There's plenty of room in there.
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RE: Wrong size jointer knives - jeffss - 04-06-2022
Yes on the jack screws. I guess my concern was raising them to the point of not getting a good grip. Raised them and it looks good. thanks.
RE: Wrong size jointer knives - Kudzu - 04-07-2022
Just an FYI. There are lot of companies that will make knifes for you. With a little searching on Google you can find them. Odds are one of them have the right size in stock.
RE: Wrong size jointer knives - kurt18947 - 04-09-2022
(04-07-2022, 08:44 AM)Kudzu Wrote: Just an FYI. There are lot of companies that will make knifes for you. With a little searching on Google you can find them. Odds are one of them have the right size in stock.
Don't even need Google. Did everybody forget about Holbren? 3 piece set 8" x 7/8" x 1/8" V2 HSS $40.74. He at least used to do 10% off for Woodnetters. I don't recall just how to get it, might require a phone call.