Today is my annual fix-up and tool checkout day. When going over the
PM-66 TS, I checked blade to miter slot alignment which looked good
but then tilted the blade 45 and checked again. Off about .008 from
front to back of blade. Never checked this before because of not
having a dial indicator at the time. Seems to be something that could
be tweaked a little. Is this corrected by shimming the saw top front
to back? Couldn't find anything dicussing this DAGS.
Thank's for any info.
John, in Minnesota
No. If your blade is parallel in the vertical position but not parallel when
tilted, it means that the pivot is not parallel to the top. Move the pivot
or move the top, whichever is possible. Unless I could see that there was a
problem during actual use, I wouldn't worry about it. Dial indicators often
cause one to worry about insignificant things.
Yeah, but...this small a misalignment just about comes under the old, "If it
ain't broke" maxim. It's probably not worth messing with unless you're seeing
problems with cuts.
"Property is not the sacred right. When a rich man becomes poor it is a
misfortune, it is not a moral evil. When a poor man becomes destitute, it is a
moral evil, teeming with consequences and injurious to society and morality."
That could indicate that the tilt axis is not parallel to the plane of the top. But,
I'd advise leaving it alone unless you are
noticing a problem with the cuts made with a tilted blade.
My reason for recommending this is when you start shimming, if you introduce a
left/right tilt in the table top, then the axis of
rotation used to raise and lower the blade will not be parallel to the table top and
the blade alignment with no tilt will vary with
depth of cut.
Secondly, the measurement you made can be very difficult to make and could have a
large margin of error. Very small variations in
the height on the blade at which the measurement is taken can very easily account for
the .008 variation you are seeing.
If it ain't broke (screwing up your cuts), don't try to fix it.
Wichita, KS USA
Major brain fart, please ignore.
Left to right tilt on the table is easily accommodated with adjustment of the 45/90
degree arbor tilt stops. The effect described,
alignment changes with changes in depth of cut, indicates the depth of cut axis is
not parallel with the arbor rotation axis.
Depending on the design of the trunnion assembly, there may be adjustment provisions,
but far more likely this would be either a
defect in the machining of the trunnion or warpage in the trunnion after machining -
a defective trunnion in either case.
However, my recommendation remains the same. If it ain't broke, don't fix it..
Wichita, KS USA
One of the magazines did an article on this a few years back .. .. the
axis of tilt is not parallel to the table top. Slight shimming of
either the front or rear table mounts will bring this into alignment.
If it's not burning or causing kickbacks and the cut quality of bevel
rips is acceptable, .008" really is not too bad.
On Thu, 22 Apr 2004 13:57:32 -0500, "John, in MN"
I checked again just to be sure by measuring from the other
side of the blade. No problem. Looks like a small dip in
the ole cast iron top is what I was measuring the first time.
Everything else looks good so the PM-66 alignment is done
for about another year. I'm really impressed how well these
saws hold their alignment. 20 some years old ( I'm guessing )
and it's still running great.
Sorry for the false alarm and thanks for the replies.
John, in Minnesota
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