Arbor shaft and blade spins when trying to remove TS blade
Wywoodya
| Posted in New To Woodworking on
I recently got a table saw and thought it’d be fun to put a dado blade on it. Install went smoothly. However when I’m trying to take it off the arbor nut won’t budge. I have a wrench on the flat within the shaft. I do have to admit I wasn’t aware of reverse threads so I am sure I tightened it to the moon. But I’ve tried everything and nothing stops the blade from moving and the arbor nut. I attached a little video to hopefully help thanks in advance
Replies
You are using the blade as a mean to block the arbor as you turn the nut, this is a widely used technique that relies on the friction between the blade and the arbor flange to stop the arbor from turning. I’ve used this technique a few times when I purchased my Unisaw but quickly found out that there are flats on the arbor shaft just behind the flange in which a flat cone wrench fits nicely and now I can control the torque when tightening the nut without relying on friction and not having to block the blade.
If you are using both wrenches and not getting anywhere, you may need to use a breaker bar on the nut. If that is still not enough than slip a 2-4ft pipe over the breaker bar for increased leverage.
not all saws have flats on the arbor. my powermatic 65 doesn't. I wish it did.
If your arbour and blade will turn even with the arbour wrench holding it, it sort of smells like the key has fallen out of the keyway, or a missing set screw. Did you try to cut anything? The tension of the belts might be enough to spin the blade but the blade would stop when it hit wood. Sounds like you are aware of the left hand thread on the arbour.
Over tightened arbor nut. The wrenches usually supplied with machinery are usually pretty much junk. You need a better and probably longer wrench. Technique A) the wrench on the inside flat on the arbor needs to be jambed against something so that it can't turn and using a wrench for the arbor nut that has some length should do it. Technique B) Jamb or clamp a block of wood against the table and raise the blade until the teeth catch into the immovable wood..or... Do this in conjunction with plan A. The longer the wrench the more mechanical advantage you have. A 150 lb person using a 6 inch wrench is delivering about 50 foot pounds, or so I read somewhere. You need more.