I think sheetmetal gauge is based on this, the weight per square foot per inch of thickness. This is why different materials can be different gauge for the same thickness:
As the gauge number increases, the material thickness decreases. Sheet metal thickness gauges for steel are based on a weight of 41.82 pounds per square foot per inch of thickness. This is known as the Manufacturers¡¯ Standard Gauge for Sheet Steel. For galvanized material, the decimal by gauge and weight per pound is different than steel due to the coating weight.
Example 1: A 10 gauge steel sheet which has a thickness of 0.1345 inches will weigh 41.82 * 0.1345 = 5.625 pounds per square foot.
Example 2: A 10 gauge galvanized sheet which has a thickness of .1382 inches will weigh 41.37 * .1382 = 5.718 pounds per square foot.
I know in shotguns it¡¯s based on the diameter of how many balls you get out of a pound of lead. Wire gauge is a whole different situation entirely. Probably why in manufacturing they have gotten away from most gauge call outs and now specify thickness of the material.
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Just as a point of clarification, when discussing sheet metal or wire ¡°gauge¡±, the lower the number the larger (thickness, diameter, etc) the dimension. For example, for bare sheet metal 16ga is about .060¡±, 10ga is about .135¡±. The values change for brass, aluminum and other alloys and also for wire but the concept stays the same, lower number = larger dimension. For sheet metal the best I have been able to determine is that for a fixed volume, say 12¡±x12¡±x12¡±, the number of 12¡±x12¡± plies needed to stack up to 12¡± is smaller for thicker material and larger for thinner material. The methodology used to determine the seemingly random gauge thicknesses is still a mystery to me.
?Air Handling is a good supplier of spiral goods: .? They have the straight section joint pieces I mentioned.
is my favorite snap lock supplier.??
Marlowe
Marlowe
On Wed, Jul 14, 2021, 10:32 AM imranindiana via <imranindiana=
[email protected]> wrote:
Hi Bird,
¡°Maybe I¡¯ll try something lighter gauge as you suggest, Imran.¡±
If by that you mean HVAC fitting to connect then yes. If you mean spiral pipe than that is not what I suggested. I like the heavy gauge pipe I got from Rockler. Like others have suggested just screw or rivet. I also used AL tape to seal and yes, it is hard to remove.
Definitely pre drill. I even connected some cast AL blast gates to spiral pipe with screws.
Imran
On Jul 14, 2021, at 9:44 AM, Bird Cupps <
birdc@...> wrote:
Maybe I¡¯ll try something lighter gauge as you suggest, Imran.
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