I have a Milwalkee 7 1/4" circular saw. When I tighten the nut to secure the blade it continues to turn never completely stopping. Then when I run the saw it comes loose again every time. I've taken nut and washer out, cleaned and shop vac'ed it and it still won't tighten. Can hear it turn mototr inside. Suggestions? Thanks Jim
Circular saw blade won’t tighten
circular-saw
Related Solutions
Make a shim out of thin cardboard and place it between the inner blade washer and the blade. The blades they're making these days are thinner than the older blades and some of the older saws have to be shimmed in order to prevent blade slippage.
If you're sure it's the shaft that's loose, and not a misalignment in the blade attachment, then it's most likely one of the bearings supporting the shaft that's bad. Check for play in the bearing flange (Component 36). If that's solid, then check the bearing sleeve (component 13). Unfortunately if it's the armature that's damaged (component 3), then you're better off buying a new saw.
Best Answer
Either you're not using the arbor lock feature (look for a button or lever nearby which engages a hole or slot in the arbor as you turn), or your bolt is stripped.
Use the arbor lock or replace the bolt.