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where's my table saw?
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Are there any "jack" screws?

They are on the bottom of the cutterhead and are adjustable to set the knife's base on. Once the knives are resting on the jack screws evenly and the gib screws are snug enough to hold them in place, start to tighten them gradually. If necessary tap them down with a plastic mallet or a block of wood to keep them resting on the jack screws.
I have the same planer possibly, a 12" Belsaw 9103 model. It has 2 jack screws per blade. The gib screws are vertical to the cutterhead and draw the gib downward as you tighten them. Your planer may be different. Post a picture of the cutterhead and details.

Jack screws are part no. 53 here on 910 parts diagram:
http://www.belsaw.com/MiscPDFs/910_Dia_PL.PDF
 

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where's my table saw?
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OK, this belies physics...

It's against gravity and the wedge shaped gibs being drawn down as they are tightened. Are the blades dry and clean and the wedges and slots dry and clean? That's the first thing I would try.

The next question I have which type of height adjustment gauge are you using? Factory supplied? I have several including a micrometer style. I just don't recall this being an issue as I have changed out my blades.....hmmmm. :blink:
I have this one:
http://www.ebay.com/itm/WP0452-Wood...753?pt=LH_DefaultDomain_0&hash=item43b29e2a21

here are the factory types:
http://www.belsaw.com/bellcat_pdf/Blitz_p3.pdf

If I remember, the procedure is drop the blade onto the jack screw insert the 2 gibs and then center them on the screw holes using a small Phillips screw driver in the hole. Drop the screws into the holes and snug them first, then tighten them up. I don't know what else would cause the blades to raise as you tighten the gibs down.... anti-gravity :eek:

Don't ask me how I ended up with so many planer knife setting guages, and I have already given one set away. The red one at the bottom doesn't have enough offset for this planer, about 1/8" off the cutter head, maybe up to 3/6".
 

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where's my table saw?
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31,928 Posts
the white rings

They are clamps that go around the cutterhead and have notches for the blade to fit in. Your hose clamp idea isn't all bad and the rings perform the same function. They are what I used the last time I changes out the blades if I recall. Now I also recall sanding the surfaces of the gibs on some 320 wet dry paper to remove any hints of imperfection or crud. The blades could also be "polished" in the same way. It shouldn't be this difficult. :no:
 

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where's my table saw?
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sharpening

Sharpening doesn't not change the thickness of the blade. It does reduce the width, the amount of height that protrudes over the cutterhead. Your blades may have reached that optimum width and are being squeezed up a bit when they get tightened. New blades are the best solution for several reasons...they will be sharpened correctly and will be the correct width.
I get mine here: http://www.holbren.com/jointer-planer-knives/
Use the online discount code BT310. :yes:

You'll need to establish the correct amount of blade exposure from the cutterhead. I don't know how to give you a measurement for that. Maybe there is info online or a call to Belsaw will work, I donno? The jack screws may be to high now if the blades have been "oversharpened" . I could give you that number from my cutterhead.

OK for what it's worth... 5/32" to the bevel, not the tip of the blade. OR 1/4" from the blade tip to the gib surface which is below the cutterhead. I noticed that the jack scews had backed away from the blade in the thightened position for some reason. Could have been just vibration, I donno?
 
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