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Question on edge jointing

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Forum topic by Alongiron posted 10-20-2011 02:28 AM 1005 views 1 time favorited 12 replies Add to Favorites Watch
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Alongiron

435 posts in 1440 days


10-20-2011 02:28 AM

I have a Grizzly 0452 6 1/4 jointer that has been working flawlessly since I set it up 6 months ago. Today when I was edge gluing some boards up for a project there seems to be a slight bow in the middle of my board. For example: My boards are 16” long..after I run them though the jointer a couple of times to perpare them for edge gluing they are nice and tight on the ends of the boards but there is maybe a 1/16” space half way. I have ran them through maybe 5 or 6 times thinking the board was that much out but I can not figure out what is going on! I have reset everything, squared everything, and even kicked it a couple of times!

Has anyone else had this problem and if so how did you overcome this issue? Thanks

-- Measure twice and cut once.....Steve Lien


12 replies so far

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HerbC

1212 posts in 1606 days


#1 posted 10-20-2011 03:14 AM

Actully, a well recognized technique uses this type of slight bow to improve the joint. It’s called a “spring joint”...

Good Luck!

Be Careful!

Herb

-- Herb, Florida - Here's why I close most messages with "Be Careful!" http://lumberjocks.com/HerbC/blog/17090

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oluf

257 posts in 1786 days


#2 posted 10-20-2011 04:07 AM

I would resharpen your blades and set them proud of the outfeed table by one and a half to two and a half thousands. Trust me, it works.

-- Nils, So. Central MI. Wood is honest.Take the effort to understand what it has to tell you before you try to change it.

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Jim Jakosh

12333 posts in 1852 days


#3 posted 10-20-2011 04:31 AM

Have you checked the board when it comes off the jointer to a true straight edge ? Are both pieces bowed 1/32 or is it just in one board? They should be perfectly straight coming off the jointer, When I set my Grizzly jointer up, I first back down the out feed table and then run a board through long enough that is will run an inch or two over the out feed table. Turn off the cutter and then slowly bring the out feed table up until it just touches that fresh cut. Then slide the board back and move it forward to see that it does not catch and there is no space under it. That should align the table with the cutter.
Give it a try and check the fresh cut board against a straight edge.

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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tomd

1802 posts in 2517 days


#4 posted 10-20-2011 04:38 AM

This maybe a technique problem. Check your feed over the blades.

-- Tom D

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BentheViking

1755 posts in 1311 days


#5 posted 10-20-2011 05:19 AM

Tom’s answer was exactly what i was thinking….my mind was blown when i learned how to use a jointer to fully utilize all of its potential

-- It's made of wood. Real sturdy.--Chubbs Peterson

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ShaneA

5449 posts in 1345 days


#6 posted 10-20-2011 05:23 AM

+1 on technique, maybe something you are doing or not doing is different at this time.

View GregD's profile

GregD

637 posts in 1883 days


#7 posted 10-20-2011 05:32 AM

If you get any insights into what you need to do different in your technique to get better results, please post them. I had a similar problem making up some panels. But, like HerbC said, I told myself I was just making “spring joints” and used a few extra clamps to make sure the little gap closed up.

-- Greg D.

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Kelby

133 posts in 1157 days


#8 posted 10-20-2011 05:38 AM

Your blades are probably set too low (below the plane of the outfeed table).

Set a straight edge on the outfeed table, just extending past the cutterhead. With the jointer unplugged, turn the cutterhead manually. As the cutterhead turns, the blade should catch the straight edge just enough to move the straight edge 1/8” or so in the direction of the infeed table. It should not lift the straight edge UP 1/8”; it should barely lift the straight edge, and hold it long enough to move it 1/8” horizontally toward the infeed table. You need to test each blade at both edges of the blade, and they should all move the straight edge an equal amount. (I prefer about 1/16”, but the textbook jointer setup is 1/8”.)

Good luck, and let us know how it goes.

-- Kelby

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tom427cid

294 posts in 1217 days


#9 posted 10-20-2011 08:18 AM

I think that “technique” is very important. Before you adjust the out feed table try this. After you start the board and it is on the outfeed table,exert most of the hold down pressure on the outfeed table.Use a slight down pressure on the part that is on the infeed table as well as pushing the piece across the knives.
Hope this will help-it took me a while to get the hang of it. After I did I had better joints.
tom

-- "certified sawdust maker"

View Alongiron's profile

Alongiron

435 posts in 1440 days


#10 posted 10-20-2011 11:50 AM

Thanks for all the great advice. I’m gonna try each and everyone of your ideas and see what works for me. I will post the results what I find when I’m done. Thanks again so much. that’s what makes this website so great

-- Measure twice and cut once.....Steve Lien

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fussy

980 posts in 1797 days


#11 posted 10-20-2011 11:31 PM

As allways, do the simple stuff first. Chances are that as you have gotten more familiar with the jointer, you have gotten sloppey in your technique. Jointers are deceptively simple, and can be maddeningly fiddly to set up, but once working well do not just go out of whack; unless you left something loose but it would show up faster. Beore you try adjusting and make things worse, stop, breathe, and take a look at how you feed it and where you apply preassure. You will find the answer there.

Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

View Alongiron's profile

Alongiron

435 posts in 1440 days


#12 posted 10-21-2011 02:46 AM

I figured out what was happening! The outfeed table was set to high so when I did use pressure on the outfeed table it was lifting the board up towards the back. I used Jim Jakosh’s help with the setting up the outfeed table the way he told me how in his above messaage…ran a piece through with pressure on the outfeed table.. and I am back in business!!

Thanks everyone for all your help! Thats what i love about this woodworking site!

Steve

“Have you checked the board when it comes off the jointer to a true straight edge ? Are both pieces bowed 1/32 or is it just in one board? They should be perfectly straight coming off the jointer, When I set my Grizzly jointer up, I first back down the out feed table and then run a board through long enough that is will run an inch or two over the out feed table. Turn off the cutter and then slowly bring the out feed table up until it just touches that fresh cut. Then slide the board back and move it forward to see that it does not catch and there is no space under it. That should align the table with the cutter. Give it a try and check the fresh cut board against a straight edge.”

—Jim Jakosh…..Practical Wood Products…........Learn something new every day!!

-- Measure twice and cut once.....Steve Lien

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