Dewalt miter saw blade wobble after kickback, before you buy parts

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Blog entry by OldBull posted 10-13-2020 02:40 PM 373 reads 0 times favorited 0 comments Add to Favorites Watch

I recently had a kickback on my miter saw and noticed blade wobble while assessing the saw after a blade change. I imediately thought bent motor shaft and went to the internet to see if others have had this and yes they had. On my Dewalt DWS715 the blade is not directly attached to the motor, it is driven through a geared shaft called the arbor and gear assembly. I called Dewalt and recieved a callback within a few minutes. I was trying to get the right part number for what I thought was a DW715 type 20, but could only find type 1, 2 or 3. The rep thought it was not a DW715 but rather a DWS715. I went out and re-read the label and it was in fact a DWS715, which is the only miter saw that is type 20, and according the rep the DWS715 so far only has a type 20. I thanked him and ordered the part online.

I installed the part and still had the same wobble. $87 dollars and no fix. I mounted the old part between 2 blocks of wood, mashed it between my moxon vice and and screwed on the blade using the old arbor and gear assembly and the 2 parts that hold the blade + the spacer. In the owners manual the 2 parts are referred to as clamps, in the parts diagram they are listed as washers. I spun the blade on the assembly and there was the wobble. 87$ spent on the arbor and gear and only really needed 20$ for the weakest link in the assembly, the washers/clamps that hold the blade. Which one was it, I believe a little of both. I also replaced the spacer and would have replaced the screw but it is on back order. So if you have blade wobble try the washers/clamps first. In trying to assess the parts to see if I could see what/where they were bent it was almost impossible. I believe the outer darker clamp had a tiny amount of movement when I rocked it back and fourth on my saw table but it was difficult to say it was bent. In the end I have a straight blade and no wobble and a spare (at least I think spare) arbor and gear assembly. Sorry, I didn’t put the old arbor and gear on the new clamps because I was tired and wanted it done. I have the old original blade but it will probably never be used again. To add to all the money spent was a new left side fence, another $38, getting close to a new saw, a decision you may have to make.

There is a method that I did not use of marking the blade and rotating the washers 180° to see if it changes where the blade is far left/ far right. It is an online video.

Last but not least there is a gear lube (grease) that is blonde in color and smells like 90 weight gear oil, If you change this assembly re-use the excess around the old gear and housing to lube the new gear assembly.

P.S. Think before you cut that chunk of wood at an odd angle in your saw, listen to the little voice in your skull that is saying, “yo man, that don’t look right” . . . .

Be safe, C ya,

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