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Forum topic by cutworm posted 612 days ago 661 views 0 times favorited 9 replies Add to Favorites Watch
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cutworm

1064 posts in 1425 days


612 days ago

I’ve had my jointer a couple of weeks now and I am in the learning and exploring phase of my ownership. I have the knives set to within about .01 to .02mm of each other and IB to OB variance as well. I ran test cuts and have a question. I made 6 passes on a 4” wide board in the same direction and orientation and measure a thickness difference on the board of about the thickness of one of the lines on my scale of my vernier caliper. I’d guess at about just under 1/64th”. I have no idea as to what is acceptable or unacceptable on a jointer. I can say that adjustments are pretty crude on the knives made by 2 jack screws on each knife. Please share any methods or info on setting the knives correctly.
Thanks,
Steve

-- Steve - "Never Give Up"


9 replies so far

View pintodeluxe's profile

pintodeluxe

3334 posts in 1445 days


#1 posted 612 days ago

Is the thickness difference from side to side, or from one end to the other?
Crooked blades could create a side to side taper. Jointer beds not exactly coplaner will result in a long taper from one end to the other. Jointer beds must be within .002” of coplaner to avoid cutting tapers.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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cutworm

1064 posts in 1425 days


#2 posted 612 days ago

Sorry. Side to side.

-- Steve - "Never Give Up"

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teejk

1208 posts in 1316 days


#3 posted 612 days ago

hard to tell but you are explaining a planing operation vs. a jointing operation? if so one or more of your knives are high or low.

goof with it you want but I personally would marry a jointer that would get under 1/64th after 6 passes running in the same direction (that is to say that I think you have it tuned about as best as you will ever have it tuned…mess with it and you’ll be posting back about why the variance is 1/32nd).

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cutworm

1064 posts in 1425 days


#4 posted 612 days ago

Tee,
I guess I was planing. I did repeat passes to hopefully compound the error. My cup is nearly empty when it comes to jointers. The error seems ok to me but I really don’t know for sure. My total knowledge comes from a video or 2 on youtube. It would be nice to have a sure fired method. I spent several hours setting the knives with a dial indicator. What a pain. Thanks for the info. I sorta thought I may need to quit while I have it pretty close. I thought I might try to alternate directions and see what happens. New stuff to me.
Thanks,
Steve

-- Steve - "Never Give Up"

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teejk

1208 posts in 1316 days


#5 posted 612 days ago

steve…less than 1/64th after that many passes…I say you have done a great job. It is indeed wood (even if absolutely perfect, you would make it less so simply in sanding).

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Straightbowed

717 posts in 930 days


#6 posted 612 days ago

give up on perfection start building worry more about finishing thats the whole key to woodworking just sayin just kiddin merry xmas

-- Stevo, work in tha city woodshop in the country

View Loren's profile (online now)

Loren

7425 posts in 2280 days


#7 posted 612 days ago

Flatten one side, then make that side parallel on the planer.

If your planer is off from side to side, fix that. The jointer,
being a hand-fed machine, is subject to operator error.

-- http://lawoodworking.com

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cutworm

1064 posts in 1425 days


#8 posted 611 days ago

Great! Thanks for the advice. I’ll leave well enough alone. I dread the day I need to replace knives. 10-4 on the operator error. That’s my middle name. Oops!

-- Steve - "Never Give Up"

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Fuzzy

289 posts in 2620 days


#9 posted 611 days ago

” Jointer beds not exactly coplaner will result in a long taper from one end to the other. Jointer beds must be within .002” of coplaner to avoid cutting tapers.”

I BELIEVE you mean PARALLEL tables … not COPLANAR …

COPLANAR tables will give you a large, sweeping curve with a big snipe at the trailing end.

-- - dabbling in sarcasm is foolish … if you’re not proficient at it, you end up looking stupid … ... ...

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