TS 75 Blade wobble

[bpcook]

I purchased a used TS 75 to add to my collection of Festool tools. It came with a number of accessories and I was happy with everything. I have a TS 55 and have used it a fair amount and really like it. I needed to rip a live edge slab to width so I pulled out the TS75 and the 18 tooth blade that was with it when I purchased it. The cut it produced was not good at all, there were burn marks and lines left from the blade. I then assumed the blade was dull and took it to my Festool dealer to get sharpened. I purchased a 16 tooth Panther blade and tried it out. I noticed the at the blade wobbled as it spun. It moves back and forth almost 1 mm at the edge. I remounted the blade and leaned all the surfaces that contact the blade. It still wobbled the same. The cut it produced was really nice and smooth on the slab. I was wondering if anyone has any idea why it would be wobbling. The saw did not look abused by the previous owner, but it was used in production in a small cabinet shop. Thanks for the help.

 

[Holmz]

One could mark where the balde is sticking out, then rotate the blade.
If the high spot rotates then arbor shaft is bent. If it stays the same, then the blade is a Pringle.
It may only take a kickback to bend the shaft(??) I dunno. But I would start there and then you either need a blade or a new shaft.

 

[Svar]

Is the arbour screw tight? TS75 arbor has clutch with Belleville washers that act as a spring. Tightening the arbour screw is different than on any other saw. From the point you start to feel resistance the screw will go another half turn as the washers compress, and only then come to a stop. Unless those washers completely compressed the blade might have visible wobble.

 

[flair woodworks]

If the arbor flange is indeed clean as well as the blade, the wobble can be from either a bent blade, bent arbor, untrue arbor, or play between the arbor and bearings. Do you have a dial indicator you can use to check?

 

[bpcook]

I finally was able to do some checking on my TS75. I had turned the screw that holds the blade on until it felt like it was snugging up and then had turned it about 1 turn farther. Svar had mentioned that it is different tightening the screw and to make sure it was tight. I used a dial indicator and measured that the blade was moving left and right about 15 thousandths of an inch. It was easy to see without a dial indicator. I then tightened the screw until it stopped turning (about 1/2 turn more). I could no longer see a wobble in the blade and with the dial indicator is reads only about 2 thousandths movement left and right. I think the only problem I had was that I had not tightened up the screw enough. (a nice repair to make)
Thanks for the help.

 

[ear3]

Glad you worked it out.  Yeah, the first time I changed the blade on my TS75 I thought something must be wrong with my saw.  But then I went to the dealer and tested out the blade changing on their floor model, and realized this was just the way the saw was engineered.  But I still sometimes get that feeling when I'm changing the blade that I'm going to snap something!

I finally was able to do some checking on my TS75. I had turned the screw that holds the blade on until it felt like it was snugging up and then had turned it about 1 turn farther. Svar had mentioned that it is different tightening the screw and to make sure it was tight. I used a dial indicator and measured that the blade was moving left and right about 15 thousandths of an inch. It was easy to see without a dial indicator. I then tightened the screw until it stopped turning (about 1/2 turn more). I could no longer see a wobble in the blade and with the dial indicator is reads only about 2 thousandths movement left and right. I think the only problem I had was that I had not tightened up the screw enough. (a nice repair to make)
Thanks for the help.