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Speaking of metal sheet gauges - I just learned a lot on this webpage:?

Reminds me of my upholstery work where the button sizes are in numbers that seem like inches, but not quite. Turns out upholstery work goes back to Euro hatmakers, textile mfg, and clockmakers who stuck to the "French inch", the "ligne" back in the early days of standardization.

On Wed, Jul 14, 2021 at 12:48 PM Kevin Wells <kjwells54@...> wrote:

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.

On Wed, Jul 14, 2021 at 9:13 AM Marlowe McGraw <marlomcgraw@...> wrote:

?Air Handling is a good supplier of spiral goods: Airhand.com.? They have the straight section joint pieces I mentioned.

CarolinaAirSystems.com 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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Kevin J. Wells

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Brett Wissel
Saint Louis Restoration
1831 S Kingshighway Blvd (at Shaw Blvd)
St Louis, MO 63110

314.772.2167
brett@...