pyotr filipivich wrote:

DerbyDad03 on Fri, 6 Jul 2018 18:39:13 -0700
(PDT) typed in rec.woodworking the following:
On Friday, July 6, 2018 at 11:51:40 AM UTC-4, Electric Comet wrote:
https://www.harborfreight.com/saw-mi...ine-62366.html
nothing visible holding the material
for that material a beam saw with the right blade would be faster
and give a much cleaner cut
max capacity is 20 inch log but it does not look like it could do that
maybe that plate in the throat moves up and down
that just needs a trailer to be complete otherwise there would be a need
to make sure it is level
maybe if it was on a concrete slab
Level is not the main concern and may not even be deisrable.

From: http://www.woodweb.com/knowledge_bas...your_mill.html

"When calibrating the surface of your bed, using a 4' level is a good tool.
However, a 4' level will not show a camber or twist in your bed. However
slight they may be, they will affect the final quality of your lumber. If
there is even a slight twist in your bed, as the carriage travels over that
twist, you will be sawing that twist in your cant. Then, when you turn your
cant 180 degrees, that twist is compounded to the other side of the cant. This
will give you uneven lumber, and you may tear your hair out trying to figure
out why. A camber will do basically the same thing. The best tool to use is a
transit if your bed is 18' or longer to make sure your setup is correct. We
hold our bed tolerance to +/- .060" all around. We then check the location of
the blade to the bed at every cross member to maintain consistency. You may
also have bridging rods under your bed. By tightening or loosening them, they
will cause or cure camber and twist as well. A flat bed makes a big
difference!"

Some folks at that site don't want it level. They lean the rig down hill
'cuz they've heard of gravity.

I worked as a machinist for a while. Relevant to this discussion
is the difference between "flat" and "level". In short, you have a
"box" N units high in which the line/surface has to be, in order to be
flat. If said box is also perpendicular to gravity, then your "flat"
surface is also "level".

https://www.youtube.com/embed/gn4li_...start=20&rel=0