4" Square to 9" round transisition questionss.

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mcostello
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4" Square to 9" round transisition questionss.

Post by mcostello » Fri Feb 06, 2015 9:15 pm

I have to adapt a small fan into a blower flange, original motor not available anymore. So I need to make a 4" square transition to 9" OD round. Decent machinist abilities, all normal machine shop machinery available. How to go about this? No practical tin knocking experience, except for occasional 90° bends. What would be the minimum length obtainable. How to make a pattern? No CAD experience. Thanks for all help, Mark.

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ken572
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Re: 4" Square to 9" round transisition questionss.

Post by ken572 » Fri Feb 06, 2015 10:08 pm

Hello :!: Mark :D

These might be very helpful to you.
-
Two Sheet Metal Treatise's (Great Material)

http://www.chaski.org/homemachinist/vie ... 44&t=97765
-
Enjoy.

Ken. :)
One must remember.
The best learning experiences come
from working with the older Masters.
Ken.

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mcostello
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Re: 4" Square to 9" round transisition questionss.

Post by mcostello » Mon Feb 09, 2015 10:32 pm

Replied earlier, don't see it now. Thanks, wondered how it was done.

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ken572
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Re: 4" Square to 9" round transisition questionss.

Post by ken572 » Mon Feb 09, 2015 11:46 pm

mcostello wrote:Replied earlier, don't see it now. Thanks, wondered how it was done.
Mark, :D

Maybe this will be easier for you to grasp.

http://www.sheetmetalguy.com/transition.htm

Ken. :)
One must remember.
The best learning experiences come
from working with the older Masters.
Ken.

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mcostello
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Re: 4" Square to 9" round transisition questionss.

Post by mcostello » Wed Feb 11, 2015 9:39 pm

Thanks, already d/l ed. Will give it a spin, thanks.

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ken572
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Re: 4" Square to 9" round transisition questionss.

Post by ken572 » Wed Feb 11, 2015 10:12 pm

mcostello wrote:Thanks, already d/l ed. Will give it a spin, thanks.
Mark, :D

Do we get to see your finished product :?:

Ken. :)
One must remember.
The best learning experiences come
from working with the older Masters.
Ken.

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mcostello
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Re: 4" Square to 9" round transisition questionss.

Post by mcostello » Thu Feb 12, 2015 10:27 pm

Will post a picture but will take a little time to get to it.

Andy Rafferty
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Re: 4" Square to 9" round transisition questionss.

Post by Andy Rafferty » Sun Feb 22, 2015 9:17 am

I bet I'm behind the curve as usual but here's how a dummy like me can do it quickly. cut a circle and a square out of any material. center drill both and attach jam nut style on a pc. of all thread the length you need the transition to be. When you roll the pattern over your metal mark the path of both pcs. allow a lap for the joint cut it out and you have it.

Russ Hanscom
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Re: 4" Square to 9" round transisition questionss.

Post by Russ Hanscom » Sun Feb 22, 2015 2:12 pm

Great tip, thanks - for reasonable sized work that method would be hard to beat.

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SteveM
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Re: 4" Square to 9" round transisition questionss.

Post by SteveM » Sun Feb 22, 2015 6:38 pm

mcostello wrote:I have to adapt a small fan into a blower flange, original motor not available anymore. So I need to make a 4" square transition to 9" OD round.
Why don't you check with Gene Krantz. I think he's done something along those lines a few years ago. :-)

Steve

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