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Jointer chatter for first 4 inches then fine?

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Forum topic by 404 - Not Found posted 566 days ago 744 views 0 times favorited 17 replies Add to Favorites Watch
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404 - Not Found

2544 posts in 1574 days


566 days ago

I wondered if anyone had experienced this before. At present I’m making a job out of steamed beech. Every board I’ve tried to put an edge on has chatter marks for the first 3-4 inches, not the close together ones, but bumpy ones, widely spaced.
The rest of the piece is perfect. I was careful to put firm pressure along the whole length.
It didn’t do it on a test piece of oak.
Changed the knives on Monday.
Any ideas?


17 replies so far

View Jorge G.'s profile (online now)

Jorge G.

1526 posts in 1080 days


#1 posted 566 days ago

I get chatter when the piece is too thin or to light. I used to try and run the piece with one of those pads that have rubber at the bottom, but I never felt comfortable doing it, so now I just cut the piece longer since I know I will be getting chatter.

-- To surrender a dream leaves life as it is — and not as it could be.

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404 - Not Found

2544 posts in 1574 days


#2 posted 566 days ago

This only happens getting a square edge. The beech is about 23mm at the edge, so not too thin or light. It happens whether I take a full 2mm or .25mm pass.

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Jorge G.

1526 posts in 1080 days


#3 posted 566 days ago

This has also happened to me when the board was too long for the in feed bed. Other than that I am stumped.

-- To surrender a dream leaves life as it is — and not as it could be.

View mbs's profile

mbs

1423 posts in 1545 days


#4 posted 566 days ago

You’ve stumped me. Can you post a video with sound of you jointing the board and showing the results?

-- Sorry the reply is so long. I didn't have time to write a short reply.

View Nicky's profile

Nicky

636 posts in 2697 days


#5 posted 566 days ago

I don’t know how long your pieces are but this sure sounds like the the feed pressure up front is not enough. If these are really long boards could you provide more support on the in feed side? This will sound a bit crazy but from time to time, I use a feather board, just past the cutter head. This helps for certain operations.

-- Nicky

View Bernie's profile

Bernie

414 posts in 1442 days


#6 posted 566 days ago

Lots of possibilities here and although I’m a novice at jointers let me ask a novice question. Is it possible that your lumber had a twist in the growth pattern and that you’re feeding against the grain for the 1 few inches? Disregard my comment if it sounds stupid.

-- Bernie: It never gets hot or cold in New Hampshire, just seasonal!

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404 - Not Found

2544 posts in 1574 days


#7 posted 566 days ago

Nothing sounds stupid Bernie, I really am stumped on this one. I’ve had that machine for a long time, done lots of planing on it, never experienced this before.
All the pieces so far have been 3 or 4 ’ long. I have even tried putting near my full weight on it at the start of the cut and it still happens. I can only think the beech is hard on the knives.

View Jorge G.'s profile (online now)

Jorge G.

1526 posts in 1080 days


#8 posted 566 days ago

Are your knives sharp? Have you tried feeding the pieces at an angle?

-- To surrender a dream leaves life as it is — and not as it could be.

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Straightbowed

717 posts in 903 days


#9 posted 566 days ago

need to keep pressure on the outfeed just past the blades

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

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fuigb

166 posts in 1563 days


#10 posted 565 days ago

If the feed technique is constant then the only variable is the material. Problem’s gotta be the wood itself or something about its size or weight that’s causing you to unconsciously alter your technique. Pretty obvious, I know, but sometimes the answer is hidden right there in front of you.

-- - Crud. Go tell your mother that I need a Band-aid.

View a1Jim's profile

a1Jim

112002 posts in 2182 days


#11 posted 565 days ago

If you are starting the jointer just before you feed the material the chatter could signal bearing ware. After it builds speed it smooths out. I also agree that it could just be the wood.

-- http://artisticwoodstudio.com Custom furniture

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termiteholocaust

2 posts in 565 days


#12 posted 565 days ago

it could be that the bearings on the rollers are not 100 percent parallel and are wobbling whilst the full wieght of the piece is still only on the feed table how long are the boards ?

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Grandpa

3056 posts in 1280 days


#13 posted 565 days ago

This might sound far fethced but check the drive belt. If it is loose it might bog down the cutter head and slip the belt. When the belt takes hold it would speed the head up and smooth the cuts again. It could be the belt or the sheaves (pulley). I would check those first then try some of the other things named. This won’t cost much since you are only looking. Keep us posted.

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404 - Not Found

2544 posts in 1574 days


#14 posted 561 days ago

I am still none the wiser on this. I checked the belt which was a bit on the slack side, adjusted it to the right deflection as stated in the manual, but then the belt was screeching when the brake came on.
Took off the belt cover to have a look and turned it on to see if everything was ok, quite astonished by just how much the belt was flexing in and out during the first five seconds after hitting the start button.
Sorted out the squeal, belt cover back on, started it up, waited for about ten seconds to start planing in the hopes that might minimise the chatter, but alas, still the same.
Checked the tables, took out the knives, cleaned the cutterblock, put the knives back in slightly lower than they were before, results still the same.
Faces joint well, come off the machine like silk, it’s just the front four inches when edging are not quite perfect.
I’ve been able to work around it so it’s not affected the making of this job, just still scratching my head as to why this is happening.
Thanks everyone for your thoughts on this, just wanted to give an update.

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ChuckV

2380 posts in 2132 days


#15 posted 561 days ago

That sure is weird.

As some others have mentioned, could it be that the bearings are worn? Maybe when you face joint, the pressure is more evenly distributed across the cutter head and it does not wobble. Is there any difference to the edge jointing if you move the fence out toward the center of the cutter head? Do you feel any slack in the cutter head?

-- “That it will never come again / Is what makes life so sweet. ” ― Emily Dickinson

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