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The blade on my Craftsman circular saw will not tighten down and consequently slips on the spindle. I've tried packing the bolt with a washer and it didn't help. Can't find anything online so this may not be a typical problem. Could it be as simple as replacing the spring washer? Any feedback would be appreciated.

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Sorry if this is too simplistic, are all the pieces there? There is an inner drive washer with flats to engage the shaft and usually a serrate waved surface. Next comes the blade, then an outer washer and a bolt with a spring-plate permanently attached lock washer. There is a spindle lock button you use to hold the shaft when you tighten the bolt. Under normal operation, the blade should be gripped with enough force to drive it except when you dog the blade down hard into material and jam it from turning. Works kind of like the shearable key on a lawnmower, give to prevent sudden stoppage. –  Fiasco Labs Dec 9 '12 at 17:29
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Here's an even more simplistic question: There should be some sort of blade stop on the saw that prevents it from turning when you tighten the bolt down. Are you engaging that? –  Aric TenEyck Aug 8 '13 at 16:15

2 Answers 2

A very thin kerf blade might spin, if the inner and outer nuts connect before clamping the blade.

Some (most 7 1/4 inch) blades have a diamond knockout that allows it to be used with a larger shaft. If this were not in place, it would make it hard to align and tighten (would be dangerous).

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Sorry if this is too simplistic, are all the pieces there?

  1. There is an inner drive washer with flats to engage the shaft and usually has a serrate waved surface.

  2. Next comes the blade.

  3. Then an outer drive washer

  4. And a bolt with a spring-plate permanently attached lock washer.

  5. There is a spindle lock button you use to hold the shaft when you tighten the bolt.

Under normal operation, the blade should be gripped with enough force to drive it except when you dog the blade down hard into material and jam it from turning. Works kind of like the shearable key on a lawnmower, give to prevent sudden stoppage.

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I appreciate your response. As a matter of fact, I do have the exploded view in the manual for removing and reattaching the blade and all of the component parts are there. The inner flanged bushing or washer is shown as being removeable but the bushing on my saw appears to be locked in for some reason despite my efforts to remove it. –  Robert Jolly Dec 11 '12 at 18:13
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@RobertJolly - I would wonder if the spring washer has become damaged, and is no longer providing any help. This might have happened if it was overheated, perhaps by the blade slipping overly much. –  user558 Jul 9 '13 at 10:40

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