Magna Precision Dado Blade

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Forum topic by gaftech posted 03-19-2013 10:30 AM 3773 views 0 times favorited 3 replies Add to Favorites Watch
View gaftech's profile


16 posts in 1317 days

03-19-2013 10:30 AM

I recently started going through the Shopsmith tools my Dad had collected over the years and I came across a saw blade called the Magna Precision Dado, made by Magna Engineering Corp. It appears that one could adjust the width of the dado, but I’m unsure as to how safe this blade is. Any thoughts?

3 replies so far

View runswithscissors's profile


2127 posts in 1446 days

#1 posted 03-19-2013 10:04 PM

My former FIL gave me a set of Magna Wobble Washers, which are the same thing. It’s a wobble type dado, which means your dadoes will have a slightly concave or dished bottom. This may or may not be a problem. I’ve used it with 10” blades, but I think the smallest blade you can use in your TS would be safer (not sure whether that might exacerbate the dished dado bottom problem—say that 10 times as fast as you can).

It’s scary in the same way any dado set up is. Oh, I just realized, yours has a built in shaft. I’m not sure what machine that would fit on. Mine you can use on a TS or a RAS. Does that one come apart?

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View TerryDowning's profile


1052 posts in 1538 days

#2 posted 03-19-2013 11:30 PM

For Shopsmith/Magna/Yuba specific questions, I recommend the Shopsmith forums

That particular dado set is in fact a wobble dado on a 5/8” dado arbor for the Shopsmith. Setting the width is a matter of loosening the arbor (to relieve pressure on the assembly) and turning the selector to the marked width. That’s the the theory any ways. It could be rusted up on the inside of the mechanism and in my experience, the marked increments can be less than precise requiring a bit of experimentation. I recommend a getting a good staked dado set. I was never comfortable with my wobble dado.

-- - Terry

View gaftech's profile


16 posts in 1317 days

#3 posted 03-20-2013 11:17 AM

Thanks for the replies, and I did go to the shopsmith forums after I posted here. There was quite a lot of info there so I didn’t have to post. It appears that the majority of people there are not very fond of wobble dadoes.

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