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Rebuilding Rockwell 34-338 - Need advice

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Forum topic by makrothumeo posted 1422 days ago 1574 views 0 times favorited 5 replies Add to Favorites Watch
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makrothumeo

4 posts in 1422 days


1422 days ago

Help rebuilding Rockwell 34-338 Contractor Saw. I recently picked up a 1973 Rockwell 34-338 10” contractor saw. I pulled the table top off since their was wiggle in the saw and found that the steel shaft attacking the raising mechanism to the saw blade had wiggled out of one side completely and I thought that by resetting it the wiggle would disappear, however it didn’t. I can still grab the blade and lift it up and wiggle it side to side a little. Can anyone tell me how tight this shaft should be?

On the diagram i link to it is part 116 that i am talking about.


5 replies so far

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EEngineer

885 posts in 2210 days


#1 posted 1422 days ago

Wiggling the blade side-to-side might be an indicator of worn arbor bearings. Can you isolate the movement to the arbor bearings or the shaft you just reset?

-- "Find out what you cannot do and then go do it!"

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makrothumeo

4 posts in 1422 days


#2 posted 1422 days ago

The arbor is tight, no movement at all. All the movement comes from the shaft that i reset. It is a 1/4 circle with gear notches in the bottom and a set of holes at the top for the shaft to slide through. When the saw is raised and lowered, it rotates around this particular shaft.

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EEngineer

885 posts in 2210 days


#3 posted 1420 days ago

Now that’s a tough one. There simply isn’t enough resolution on that parts drawing to see exactly how that 116 shaft is assembled into the rest of it. There is a hint of detail in the parts drawing that seems to show something in the center of that shaft. Is there a part missing there that allowed the shaft to move and cause the original problem you saw? Maybe the part marked “112” in the drawing? Maybe the shaft or the holes it mounts in are worn enough that they got sloppy.

You’ll have to invest some time to figure out exactly how this was supposed to go together originally to correct this.

-- "Find out what you cannot do and then go do it!"

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makrothumeo

4 posts in 1422 days


#4 posted 1418 days ago

I keep tearing down and found a set screw on the shaft that wasn’t set. I set it and the shaft is now fixed so the unit pivots around it. However their is still a bit of slop around the shaft. Should it be a tight fit? If so, it seems my option is to get it redrilled and a new shaft milled up? Any other ideas?

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aurora

204 posts in 1849 days


#5 posted 1417 days ago

shaft should be tight in the bore, any play here will get amplified/multiplied by the lever action ration of the bearing wear to the blade diameter (shaft radius cant be more that .38” and blade probably is 5”, thats a 14 to 1 ratio). if it is not tight you probably need a new shaft or a trunnion bushings (i was surprised that the schematic showed not bushings, so might need a new trunnion). you could also bore out the trunnion and have bushings machined to fit the shaft.

on a separate note, i would locktite the setscrew in place on final assembly.

good luck

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