Doug S wrote:
The arbor bracket rides directly on the worm gear, which is on the same
shaft as the crank for raising and lowering the blade. It might be easiest
to take the table off to check it out. As you crank the blade up and down,
the arbor bracket pivots, and when it gets to the end of it's travel, there
is a stop at each end that bumps up against the worm gear. The worm gear is
held onto the shaft by a pin, and toe shaft is held in position by a stop
collar on the rear end of the shaft. If the worm gear and the arbor bracket
are misaligned, it will cause the symptoms you are experiencing. My guess
would be that either the worm gear was removed at some point and reinstalled
backward, or that the shaft has moved toward the rear thus misaligning the
worm gear and arbor bracket.

I've had the table on and off already. it's back on now, this time
"shimmed up"

http://machines.2x.nu/unisaw_worm_and_shims/

in addition, 'it looks to me' as if all my tilt and elevation gears are
in correct relation to one another, in all planes of reference...

doug, when you said "...held onto the shaft by a pin, and toe shaft is
held in position ..." I'm a bit foggy on what's a "toe shaft"? that a
typo and you meant "the shaft"

it DOES occur to me, though, that maybe some previous owner
're-installed' the worm 180 degrees 'out of synch' with the bore of the
original crosspin....so possibly that 'half-turn of the worm' is the
cause of this problem ???

thanks doug, I'm still looking into this... :-/

I'm gonna GUESS here that no matter HOW much assembly of the unisaw (my
model) was required on 'day one new' day, that installing the elevation
worm onto it's shaft *wasn't* one of the assembly steps the 'new owner'
was required to do. and I can't see any reason for ANYone prior to me
ever having 'removed' and re-installing' the elevation worm, either,
seeing as the saw is, for all practical purposes, brand new, or "near
brand new, anyway" (though, still....'could be')

so, I'm still baffled...

---------------------------

ted said:

I had the problem of the blade not lowering enough on my 25+ year old
unisaw when I first got it. Delta wanted to replace the trunnions.
Seems to me I loosened the set screws on the worm gear that raised and
lowered the blade and moved it untill it cleared the throat plate.

per the drawing (and my newly posted images he
http://machines.2x.nu/unisaw_worm_and_shims/). MY worm gear is
"through-pinned" to the worm shaft, making the approach you describe
undoable (on my saw, at least)...

thanks ted