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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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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
I am having the same problem. My Craftman saw is about 22 years old. Never had this problem before. I am wondering if the newer saw blades are thinner than they use to be. – user44768 Oct 20 '15 at 19:32

I just recently had the same issue. As simple as it sounds, try using a tap on the bolt/nut. I had the slightest bit of debris or thread preventing the bolt from making it tighten all the way, which caused resistance and caused the spindle to run while trying to tighten.

Based on your description, I guarantee this is your issue.

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Please don't post in all-caps. It looks weird and reduces the readability of the post. – Ashish Ahuja ツ Jun 30 at 11:53

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
@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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