'Warped' table saw blade

[stuartpaul]

Time to change blades thinks I so off I trot to the internet and purchase for myself a nice freud 305 mm blade.

In the process of fitting I'm aligning the riving knife with the blade when the straightedge appears to show a 'concave' blade. Change the straightedge and still the same result, concave one side and convex the other.

With much swearing and cussing I remove said blade and compare with old blade. Putting straightedge across new blade when removed from saw shows no discernable 'warp'!

I'm not overtightening but I can't understand why this should be happening.

I haven't run the saw with the new blade and don't intend to until I can least understand what's happening. I'm pretty sure any attempt to cut anything would result in a bind and possible kickback so pretty concerned.

Anyone got any ideas what might be happening?!

 

[davem62]

Is it possible for you to swap the thrust washers around on the spindle and see if it is curved the same way or other way round ,to see if there is a problem with them,if so it may be possible to have the washers faced up by someone with a metal lathe etc

 

[wizard]

The blade must be bolted to a flat surface but the retaining washer should have a raised outer edge that should be against the blade

 

[monkeybiter]

Try putting the old blade in the saw then seeing if that appears warped once in situ. Also check the straight edges against each other.

 

[stuartpaul]

I put the old blade back and it was fine, put the new blade on and that was fine as well!

Took it off a couple of times, even turned it round the wrong way and checked and no problems.

Straight edge is an engineering one so I've no concerns about that.

I have absolutely no idea what the issue was but there was a definite 'dish' to the blade (at least 0.75 mm and maybe more).

Runs OK and cuts fine so I'll crack on but make a few checks over the next couple of days.

Thanks for the suggestions.

 

[andersonec]

Rub some chalk or crayon on both sides of your "warped" blade and make a cut, if it is being wiped off your convex side then the blade should go back.

Andy