Reply by Cajunmarine

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Posted on Jet JJP-12 jointer table question

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20 posts in 1385 days

#1 posted 08-05-2016 04:19 AM

I have had mine around a year and last week I was planing a board and it somehow got jammed up and knocked one of the gears loose. I was able to put the gear back on and I thought everything was fine. Well, after I started using the planer I noticed the hight adjustment lock knob seemed to be really tight and after a little feeling around I found that the planer table height couldn’t be locked causing the bed to slowly drift down about 1/32 an inch on each pass. Well that fix was easy enough, just had to dive down to the bottom of the motor and tighten the two bolts that hold it in place. Woo hoo, I can finally finish my project. I planed a couple more boards then switched over to jointer mode. I need to face joint a 2 by 10 piece of pine. But now comes the disaster. I put my workpiece on the infeed table and hit the power button and here comes an ear piercing noise. The kind you never want to hear. 3 knives being gouged by hitting the castiron table. Sitting there I have no idea how the blades could possibly hit the table when I have the infeed table set to remove 1/32 of an inch. After crying over my blades for a while I started checking all,the settings then took out my straight edge to ensure the tables were coplainer. They were, also checked my blade height to ensure that too was set up properly.

Knowing Both tables are coplainer and the knives are set at the correct height , measured from the out feed table Common sense would say there’s no way for this to happen unless there is something else going on. Here is what I tried and what I think. With the machine off I slowly turn the cutter head until I feel the blade catching then I started lowering the infeed table about 1/64 a turn until the blade can spin freely. So here is the big issue. If I have the infeed table set just low enough to clear the blades then it’s impossible to get the out feed table back to coplainer and to the correct hight based off of the height of the knives. Then I spent many hours trying to make some very bold adjustments but once I get the tables coplainer I can lower my blades to the most deep setting and they still hit the table. I have tried doing this for 30 hours setting the tables up at different heights and the only position I have found that I can make the tables coplainer and have the knives set to the correct height won’t snag up is if I loosen the gib set screw as far as it will go. The issue with that is there is a fairly large gap between the hindge and the plate of the machine where it’s bolted any ideas on what could cause this. My only logical thought would be that somehow the cutter head shifted and that’s why I cant set the knives to the proper height.
I’d like to know your thoughts on what this could be

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