Grizzly has up graded their 17 and 19" extreme band saws by changing the
trunnions to cast iron, and raising the price $200. Are cast iron trunnions
really worth $200 (or 25%) more? The old saws actually weight a couple
If the previous designs have been found to be too light and flexible,
As Edwin points out, metal costs have increased dramatically over last
several years as well as transportation costs (it costs Griz to get
stuff here before the transportation to you) and so on.
It is also true there's far more to "value" than simply material costs.
Then there is the consideration that cast iron, as opposed to aluminum,
doesn't make a good abrasive like AlOx, preserving the contour and
clearance, thereby accuracy, for a longer time. Stamped metal isn't in the
same league, of course.
On Sun, 22 Jul 2007 11:09:49 -0700, Father Haskell wrote:
Possibly he meant momentum. Extra momentum in a rotating piece of cast
iron would minimise 'slowdown' in the blade when entering a workpiece
that's higher in moisture or denser or harder (like hitting a knot).
Just a guess. A WAG at that :-).
Registered Linux User 413057.
Both Mandriva 2007.1 and Ubuntu 7.04
"Trunnions" don't rotate, however...
"Mass" would be the most likely relevant property related for them as
well as simply more strength/rigidity if as previous hypothesized the
former tended to be undersized so they flexed under load or warped when
locking in place...
He just confused the trunnion with the wheels. The trunnion is the
cradle the table sits on that allows it to be angled. The only
significant advantage would be if it keeps the table locked more
securely. I dunno what the grizzly's are like, but once I lock the
table on my delta if I try to move it the whole saw moves not the
table. But that's also true of my little pos ryobi 9" bandsaw and I
assure you there is no cast iron to be found anywhere on it.
On my new grizzly 8" disc / 1" belt sander the table and trunnion for
the disc table are both cast iron, however they didn't machine the
mating surfaces, just rough painted castings that don't particularly
fit well together. I mention this not to imply anything about
grizzly's band saws, but just that sometimes they like to be able to
throw around "cast iron!" this and that to look better on paper
without actually being any better. I had to toss the trunnion in the
trash and make my own fixed support to make it usable.
On Mon, 23 Jul 2007 18:55:04 -0700, Father Haskell
I really don't mind if they cut back and only do it where it matters,
but if they don't do it where it counts either then it's a problem.
I was supposed to be able to lock that table in place with the two
TINIEST wing nuts you've ever seen too. The motor pulley keyway
wasn't cut all the way through and the face was machined at an angle
( >.05" variation) which made it rather tricky to try to align the
pulleys. Grizzly sent me new pulleys, a new table, and even a new
sanding disc. The new motor pulley had the identical keyway problem
but was at least flat.
At the core of the machine it's a pretty slick design, the belt is
able to be setup to do internal sanding, and you can switch between
the two pretty easily. It's the only machine I could find that could
do internal sanding like that, and I had a specific application for
that. It's too bad they put their top priority as cost/ease of
manufacture, a distant second functionality, and little thought at all
to useablity. I've had to make lots of modifications, and I'm not
done yet. The platen is wider than the belt so you can't sand into
corners, or only on one side at a time. And it's held in place with
hex head bolts. Cuz yeah, I want to keep a 10mm ratchet next to the
sander all the time. So I'm going to have to replace those bolts and
grind an 1/8" off the platen. I'll probably find something else
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