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Reply by Charlie

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Posted on Grizzly G0715p problem-blade parallelism changes with elevation

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Charlie

1064 posts in 1032 days


#1 posted 05-02-2012 03:52 PM

northeaster,
All they’d tell me on the phone was that it was a problem with the blade height adjustment geometry.

As a former millright, here’s my assesment…

I think the castings were machined “green”. Cast iron really needs to age before being machined. It can (and does) move a little as it ages. Just in the beginning. There’s a surface that’s machined flat (on the trunion half) and against which the arbor assembly travels when raising and lowering the blade (Which also has a machined contact point). If that was machined green and as it aged it moved just little, it would get exaggerated as you got farther from the fulcrum or pivot point. It would only take a couple thousandths to do this. If you crawl under the saw, I think you can see the contact point between the 2 pieces. Take the blade off and get yourself a good light. At the bottom of the travel there’s a gap between the pieces. As you raise the blade (or arbor ‘cause you’ve taken the blade off) that gap narrows to nothing. SOMETHING in that trunion assembly is not machined correctly.

My guess would be you’d have to replace the whole trunion/arbor assembly to correct it in one shot. Otherwise you’re guessing at exactly which piece is the culprit and you don’t know what this pressure has done to the other parts.

That’s a guess. You’d have to take the main table with trunions attached off of the saw to really get it in position to measure where it’s going wrong.


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