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#1
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
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 pounds more. |
#2
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
"Toller" wrote in message ... 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 pounds more. Or course not, but there may have been other improvements, plus the cost of raw material is skyrocketing so it was, perhaps, a good time to give an overall increase. |
#3
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
Toller wrote:
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 pounds more. Depends... If the previous designs have been found to be too light and flexible, surely. 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. -- |
#4
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
"dpb" wrote in message ... Toller wrote: 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 pounds more. Depends... If the previous designs have been found to be too light and flexible, surely. 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. |
#5
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
On Jul 22, 11:00 am, "George" wrote:
"dpb" wrote in ... Toller wrote: 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 pounds more. Depends... If the previous designs have been found to be too light and flexible, surely. 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. Cast iron is harder. It machines better. It's rich in graphite, which helps moving parts move smoothly instead of sticking and galling. |
#6
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
Father Haskell wrote:
Cast iron is harder. It machines better. It's rich in graphite, which helps moving parts move smoothly instead of sticking and galling. I recall hearing that another advantage is the extra weight/density of cast iron, which gives the wheels more inertia, like flywheels. |
#7
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Cast iron trunnions on a band saw?
On Jul 22, 1:47 pm, Gordon Airporte wrote:
Father Haskell wrote: Cast iron is harder. It machines better. It's rich in graphite, which helps moving parts move smoothly instead of sticking and galling. I recall hearing that another advantage is the extra weight/density of cast iron, which gives the wheels more inertia, like flywheels. Which dampens vibrations and helps machinery last longer. Not sure why trunnions would need more inertia, though. |
#8
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
On Sun, 22 Jul 2007 11:09:49 -0700, Father Haskell wrote:
I recall hearing that another advantage is the extra weight/density of cast iron, which gives the wheels more inertia, like flywheels. Which dampens vibrations and helps machinery last longer. Not sure why trunnions would need more inertia, though. 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 You can have it all. My empire of hurt. Liverpool F.C.-more European Cups than all the other English teams put together :-) |
#9
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Cast iron trunnions on a band saw?
Aardvark wrote:
On Sun, 22 Jul 2007 11:09:49 -0700, Father Haskell wrote: I recall hearing that another advantage is the extra weight/density of cast iron, which gives the wheels more inertia, like flywheels. Which dampens vibrations and helps machinery last longer. Not sure why trunnions would need more inertia, though. 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). "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... -- |
#10
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
On Mon, 23 Jul 2007 16:56:18 GMT, Aardvark
wrote: On Sun, 22 Jul 2007 11:09:49 -0700, Father Haskell wrote: I recall hearing that another advantage is the extra weight/density of cast iron, which gives the wheels more inertia, like flywheels. Which dampens vibrations and helps machinery last longer. Not sure why trunnions would need more inertia, though. 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 :-). 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. -Leuf |
#11
Posted to rec.woodworking
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Cast iron trunnions on a band saw?
On Jul 23, 3:20 pm, Leuf wrote:
On Mon, 23 Jul 2007 16:56:18 GMT, Aardvark wrote: On Sun, 22 Jul 2007 11:09:49 -0700, Father Haskell wrote: I recall hearing that another advantage is the extra weight/density of cast iron, which gives the wheels more inertia, like flywheels. Which dampens vibrations and helps machinery last longer. Not sure why trunnions would need more inertia, though. 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 :-). 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. That's typical Chaiwanese craftsmanship -- cut back heavily on finishing, finish only where it counts. I see they've lowered their standards. It's time you learned the fine art of scraping cast iron. |
#12
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Cast iron trunnions on a band saw?
Leuf wrote:
He just confused the trunnion with the wheels. He did. Oops. |
#13
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Cast iron trunnions on a band saw?
On Mon, 23 Jul 2007 22:38:56 -0400, Gordon Airporte wrote:
Leuf wrote: He just confused the trunnion with the wheels. He did. Oops. LOL. An earlier post in the thread mentioned cast iron wheels and it seems I promptly forgot what we were talking about. First signs of aging I suppose :-) -- Registered Linux User 413057. Both Mandriva 2007.1 and Ubuntu 7.04 You can have it all. My empire of hurt. Liverpool F.C.-more European Cups than all the other English teams put together :-) |
#14
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Cast iron trunnions on a band saw?
"Aardvark" wrote in message ... LOL. An earlier post in the thread mentioned cast iron wheels and it seems I promptly forgot what we were talking about. First signs of aging I suppose :-) You're not there yet if you don't recognize that the mind is the SECOND thing to go.... |
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