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Discussion Starter #1
I'm making some tenons on my table saw using a Dado Blade and Miter Gauge. My saw is a Craftsman Contractor Model and the Dado blade is an 8 inch Oshlun. I'm cutting the tenons on 3/4" X 3/4" Red Oak. The tenons will be 3/4" long. I was doing some test cuts and realized that the tenons were too thick because the blade was lowering. I could actually see the blade lower a bit....vibration or weight(?). I have the Dado width set to a little over 3/4" by installing 6 chippers in addition to the 2 outside blades. I'm going to remove most of the chippers to reduce the weight and do each tenon in a few passes. I could do it with just 1 blade but this would take a while.....I have 10 tenons to cut.
Anybody have this happen? I can't think of a way to prevent this blade from lowering on its own other than to reduce the weight.
 

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look to your locking mechanism on the blade adjustment...
 

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Discussion Starter #4 (Edited)
The only locking mechanism on this saw is to lock in the blade tilt. There is nothing to lock in the blade height. Maybe there is wear in the blade elevation screw teeth? OR, I had added grease fittings to make the blade raising and lowering really easy.....maybe this allows the blade to lower itself with minimal downward pressure on the blade during dadoing?
 

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Try locking the tilt mechanism, it might be a combination tilt /height lock. Does the locking hand wheel move?
My Bosch 4100 contractor saw only has one lock on the tilt, never had the blade elevation move with a dado running. I keep the single lock engaged after adjustments of any kind.
Herb
 

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Discussion Starter #8
Try locking the tilt mechanism, it might be a combination tilt /height lock. Does the locking hand wheel move?
My Bosch 4100 contractor saw only has one lock on the tilt, never had the blade elevation move with a dado running. I keep the single lock engaged after adjustments of any kind.
Herb
The tilt mechanism is locked....it doesn't move on its own.

Maybe I'll just cut the tenon shoulders on the table saw and finish them on the router table.
 

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Pg 21. No locking mechanism. Very strange.
yup...
the grease isn't helping either...
 

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After looking at the manual, I see where the tilt lock just locks the forward trunion on the tilt mechanism. The shaft for the elevation doesn't lock.
Must have done too good a job lubricating. Maybe there is a way you can make something to prevent the elevating wheel from rotating once it is set for the correct cut height. Some kind of clamp with a thumb knob you loosen to raise the blade then tighten to hold that wheel from turning.
Herb
 

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That is a terrible design flaw. Surely there is someway to fabricate a locking mechanism.
 
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It will take a little thinking ,because you have to allow the blade elevation shaft and wheel to move when the blade is rotated on an angle to cut a bevel.

Maybe an arm with a hole in one end cut for a clamping collar, and a slot in the handle to slide on a stud with a thumb nut to loosen and tighten down to hold in position.

Herb
 

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Jim if your getting vibration you might want to check your blades to see if you have any carbide teeth missing. I have the same
dato blades and I noticed yesterday that I have 3 carbide teeth missing on one blade.
 

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This is obviously a dangerously unsafe situation. (Yes, I know I redundantly said it twice.) Perfect excuse to buy a new saw.
 

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My small Delta saw has always done the same thing with a dado blade...I usually have to put a clamp on the blade raising/lowering knob to hold the height position.
 

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Discussion Starter #18
This is obviously a dangerously unsafe situation. (Yes, I know I redundantly said it twice.) Perfect excuse to buy a new saw.
I bought this saw when Jimmy Carter was in the White House. Unfortunately a new table saw isn't in the budget right now.
 

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Discussion Starter #19
Jim if your getting vibration you might want to check your blades to see if you have any carbide teeth missing. I have the same
dato blades and I noticed yesterday that I have 3 carbide teeth missing on one blade.
All the teeth are present. This dado set isn't recommended for and underpowered saw, which mine is. But, unfortunately I own it and it has worked well when it stayed put.
I'll see if I can rig up something to lock the blade height.
 

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Discussion Starter #20
It will take a little thinking ,because you have to allow the blade elevation shaft and wheel to move when the blade is rotated on an angle to cut a bevel.

Maybe an arm with a hole in one end cut for a clamping collar, and a slot in the handle to slide on a stud with a thumb nut to loosen and tighten down to hold in position.

Herb
Thank You......I'll see what I can figure out.
 
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