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Vintage table saw Delta/Rockwell Unisaw 34-450 - blade height problem

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Forum topic by susanrosa posted 06-01-2016 03:50 PM 657 views 0 times favorited 4 replies Add to Favorites Watch
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susanrosa

1 post in 190 days


06-01-2016 03:50 PM

Topic tags/keywords: vintage power tool unisaw problem question

Hello everyone -

My community Woodshop has a great old table saw (Delta/Rockwell Unisaw 34-450) that has been keeping us happy since the 1960s. Well, a problem has arisen that has us all stumped!

The blade height adjustment isn’t working: You can’t raise the blade more than a quarter inch above the table – if you try to keep cranking it up, the blade just drops down again. We are wondering if a tooth on a cog is broken somewhere, but we can’t see anything wrong when we look under the table.

Any suggestions? We’d love to fix the old girl up if possible.

Cheers to you all, Susan


4 replies so far

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runswithscissors

2192 posts in 1491 days


#1 posted 06-02-2016 04:08 AM

Sounds like a loose set screw somewhere, or a sheared or missing shaft key. Just a guess, as I haven’t looked closely at my Uni to see how all that goes together. But that’s where I’d start looking.

With a community workshop, it shouldn’t be hard to check this out. Have one person turn the crank while another watches the elevation worm. You may have to remove not only the blade, but the dust shroud as well. I’d also look to see that the elevation crank isn’t turning on the shaft.

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

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Clarkie

380 posts in 1307 days


#2 posted 06-02-2016 11:12 AM

Hello Susan, start by checking the trunnions, they may be filled with saw dust and are preventing the mechanism from working.

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bearkatwood

1206 posts in 477 days


#3 posted 06-02-2016 11:55 AM

My first guess was a set screw too, so not sure. I have had the works gummed up dust to where it wouldn’t raise, but not fall back down again, that sounds like either a slipping of the gears or the set screw giving way when it hits the flat. Take the top off and have a better look maybe. Hope it works out for you.

-- Brian Noel

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runswithscissors

2192 posts in 1491 days


#4 posted 06-02-2016 07:46 PM

Shouldn’t be necessary to remove the top (at least during diagnosis). The dust shroud or diverter is held on by 2 5/16” machine screws. It will require a socket with a 5” or 6” extension to remove the screws. Don’t lose the spacers behind the dust shroud when you remove the screws, as they will fall into the sawdust underneath. Then you can look directly at the worm drive to see what is happening.

BUT: Don’t do this until you have first checked to make sure the elevation crank is secure, as that is the easiest thing to check, and there’s a goo chance that is your culprit.

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

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