I recently purchased a 1940’s Craftsman table saw off Craigslist, I think it’s a model 103.0213 (manual here). I’ve been stripping the rust off of it, revamping the electrical for the switch, all sorts of stuff to make it safer and usable, and I’ve come to the blade. Here’s a picture of it:
The blade looks like it’s 7.5", and not in terrible shape (but I’d still love to replace it with a new one). From what I’ve read online, some people have trouble getting new blades to fit. I’ll be honest though, I get kinda lost in the lingo of their descriptions. I apologize for my helplessness on that. Would somebody please explain to me in plain English how to put a newer saw blade on? And obviously I’m looking for safe(r) and new, but at the same time I’m just a weekend hobbyist so I’m also looking for fairly economical.
To define the lingo:
At the link you provided, it looks like the major issue is that this saw has a 1/2" arbor and most modern 7 1/4" circular saw blades (which is probably what you'd need to use - you'd probably have to search long and hard to find 7 1/2" blades, if that is actually the measurement) are designed for a 5/8" arbor. If you put a modern blade on there, it'll be a sloppy fit with that extra 1/8" of play. Sure, you could crank the arbor nut down in an attempt to hold the blade in place, but with the torque applied to the blade when it hits wood, I wouldn't count on it holding safely. Even if it did, I wouldn't count on a nice, true cut from it. And, when you put the blade on, all the extra 1/8" of room would be at the bottom since gravity will be on and it will pull the blade down so the arbor hole sits on the arbor itself. Once you've got it tightened down, you fire up the saw and the blade bounces as it spins out of round - not exactly a safe situation, either.
Therefore, you'll need an adapter to accommodate a modern blade with a 5/8" arbor. I hit up my favorite internet search engine with
saw arbor adapter 1/2 5/8
and came up with a variety of options.
There was this post at the Bob Vila forum (from 2005) that has several on-line references and a recommendation to cut a thin piece of copper tubing to use as a bushing. (I'm not sure I'd go with that one, see cautions above).
There were a wide variety of arbor adapters to allow blades with a 1" arbor to work on a 5/8" arbor - make sure you avoid those, that's not the adaptation you're after.
Many of the adapters I found seem to be for hole saws and angle grinders, so without making any recommendation (and at the risk of being down-voted for providing shopping info) I'll list a couple of options, just to ensure you're on the right track:
Correct answer by FreeMan on September 2, 2021
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