Mack™

Discussion about Reverse Flow Smokers
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onesquin
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Re: Mack

Post by onesquin » October 14th, 2014, 1:41 am

Great build requiring very few cuts. Are these plans already on smoker plans website?



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Re: Mack

Post by Frank_Cox » October 14th, 2014, 3:47 pm

Not yet but they could be!

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Re: Mack

Post by bstory » October 14th, 2014, 9:01 pm

I think they should be!!!



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Re: Mack

Post by T&ERun » October 16th, 2014, 7:05 am

Looks really good Frank. Keep up the good work.



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Re: Mack

Post by Frank_Cox » October 16th, 2014, 2:29 pm

Thanks guys!

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 2:35 pm

Here starts the firebox insulation.
Firebox and warming cabinet have been fabbed as one big part with no guts in them yet. I've found this easiest and quickest. Notice I have only tacked the plates together at this time. I have found that it is easier to get things squared up for my door frames if I wait to finish welding.ImageImage

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 3:07 pm

This is Roxul RHT-80 insulation. It is rated at 2100*F and is 1.5" thick. My firebox dimensions should be 21Lx21Wx22 tall so I added 1.5"for the height so I can insulate the top of the FB and 3" to the width and length so I can insulate all 3 sides and the door making the width and length 24x24. Image

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 3:12 pm

First chunk of insulation inImage
Here's the first inside plate going in. I'm using 1/4" plate for the firebox liner. Image

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 3:19 pm

I use 1.5" strap to close in the top of the insulation under the throat openingImage

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 3:33 pm

Right sideImageImage

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 3:48 pm

Left sideImageImage

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Re: Mack

Post by Puff » October 16th, 2014, 4:24 pm

You surely made it seem so easy. When insulating this fire box ...I assume you are working from required interior dimensions.

1.) is there a known amount of heat preservation you calculate into the construction compared to non insulated FB?
2.) Would it have the same effect if we were to wrap the outside of a firebox and skin it with a lighter gauge steel?
3.) is this the same rigid insulation as the gravity feed but a thinner version?
4.) which is a better use of insulation...firebox, cook chamber or both ?
5.) is the better purpose of insulation to reduce the use of fuel or to preserve heat?

Sorry!


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Re: Mack

Post by Frank_Cox » October 16th, 2014, 4:35 pm

Puff wrote:You surely made it seem so easy. When insulating this fire box ...I assume you are working from required interior dimensions.

1.) is there a known amount of heat preservation you calculate into the construction compared to non insulated FB?
2.) Would it have the same effect if we were to wrap the outside of a firebox and skin it with a lighter gauge steel?
3.) is this the same rigid insulation as the gravity feed but a thinner version?
4.) which is a better use of insulation...firebox, cook chamber or both ?
5.) is the better purpose of insulation to reduce the use of fuel or to preserve heat?

Sorry!

No problems! Glad to answer!
1- I don't change any calculations when insulating a firebox.
2- that works fine also.
3- yes, same stuff. Can be ordered in any thickness.
4- I do not insulate cook chambers. Only firebox.
5- serves both purposes.

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 5:07 pm

Adding the top of the firebox
Image

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 5:26 pm

Top plate insulationImage

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 5:26 pm

Warming cabinet bottom plateImage

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Re: Mack

Post by Frank_Cox » October 16th, 2014, 5:35 pm

Throat for warming cabinet in placeImage

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Re: Mack

Post by Pete Mazz » October 16th, 2014, 6:03 pm

That's pretty slick. :beer:


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Re: Mack

Post by Puff » October 16th, 2014, 7:27 pm

Thanks for the answers

Is it safe to assume there is no insulation on the floor of the firebox? And, how are you cutting these small holes...plasma cutter? They are super clean.

For me to get a good circle without huge ugly gaps for the gravity feed stack and the 2" ball valve, I had to use a hole saw and file ....and that was a chore. Also, it was only 14 gauge.

Cool to be watching this build....


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Re: Mack

Post by Frank_Cox » October 16th, 2014, 8:57 pm

Thanks Pete!
Thanks puff!
Right, floor is not insulated. I'm using a hypertherm 045 plasma cutter and a steady hand with a template.

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Re: Mack

Post by bstory » October 16th, 2014, 9:27 pm

Awesome!!!!



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Re: Mack

Post by Smokeone » October 16th, 2014, 9:41 pm

:beer: :LG:
Dang, I've been missing out! Gonna be a nice rig Frank! :beer:


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Re: Mack

Post by Big T » October 16th, 2014, 10:18 pm

It's coming together fast!
:LG:


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Re: Mack

Post by onesquin » October 17th, 2014, 5:36 am

STOP!!!! You're making me want to build another smoker!! This build is so well thought out.



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Re: Mack

Post by Rodcrafter » October 17th, 2014, 6:08 am

That is going to be a dandy. Good work Frank!


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