Question about Delta JT160 Shopmaster 10 Amp 6 Inch Benchtop Jointer
I am unable to correct a .006'' drop on the side opposite of the fence, close to the cutter head of the outfeed table. I have the fence squared within .001'' to the infeed table, but I cannot adjust the positioning set-screw enough to raise the outfeed table to meet as required. The result are surfaces that are not aligning as the should after a cut is made. If I'm understanding this design as I should be, I should be able to make the correct set-screw adjustments in question, and then take up any difference of the other set screws that may have changed and then have a sound and square set up. Another thing this unit is doing is not cutting the latter section of a long board when light passes are taken. However, I suspect this is due to fact of the outfeed tables misalignment.
Sometimes you just have to shim them. If you've worked the gibs and can't get any more adjustment out of them, you might try buying some thin brass or copper metal stock (you can get it in rolls at Hobby Lobby) and use it as a shim to hold the table in the appropriate position.
It sounds crude, but that was the only way I managed to get my industrial 6" powermatic to true up.
Also bring the infeed table up to zero, aligned exactly with the outfeed table and check with a known true straightedge. This will help you to keep a clear idea in mind of which direction to move things when you're making adjustments.
If you can get the edges and diagonals straight, you're well on your way to straight cuts.
Make sure beforehand that the surface you're fixing to is flat and you're not clamping the machine down in a way that's torqueing the base.
Castings just aren't rested long enough these days before the surfaces are ground, and things twist a bit sometimes. You may be working with a surface not flat, and unable to get it perfect.
Good luck. I hope that helps a little.
You may need to use an auxiliary roller stand to support the outfeed of long boards to keep the weight from causing a droop that lifts the tail off the tables and prevents a straight cut.
Posted on Mar 28, 2009
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Posted on Jan 02, 2017
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