View Full Version : Need some help adding counterweights to my pit doors

jtfisher63

04-11-2008, 02:38 PM

I'd like to add some counterweights to the doors of my pits. The doors are pretty farkin heavy. Is there some sort formula to use? The doors are 32" wide and are a 1/4 of the barrel. It's a 5/16" thick 24" diameter barrel. Thanks.

smoke-n-my-i's

04-11-2008, 02:58 PM

I am sure there is and hopefully some body will be along soon to help you out. I wish I could.... sorry.

BBQ Bandit

04-11-2008, 06:20 PM

I'd like to add some counterweights to the doors of my pits. The doors are pretty farkin heavy. Is there some sort formula to use? The doors are 32" wide and are a 1/4 of the barrel. It's a 5/16" thick 24" diameter barrel. Thanks.

There are a few simple factors when determining steel weight:

(all figures are rounded up... no need for 4 place decimals here.)

A. pi (times) diameter ... Therefore (3.14 X 24" ) = 75" around the barrel.

B. 75" divided by 4 = 18.75" of steel plate (curved surface)

C. Simple steel weight is .2833 lbs/cubic inch (times) your door (in cubic inches).

Based on a few calculations and your dimensions:

(W x H x Th.) x wt/cu. in.

32 x 18.75 x .3125" x .2833 lb./cu. in. = 53 lbs. steel per door.

The fun part begins where you place the counterweights and how far out you place them.

I think thats the numbers....

PA

BBQ Grail

04-11-2008, 06:33 PM

There are a few simple factors when determing steel weight:

A. pi (times) diameter ... Therefore (3.14 X 24" ) = 75" around

B. 75" divided by 4 = 18.75" of steel plate (curved surface)

C. Simple steel weight is .2833 lbs/cubic inch (times) your door (in cubic inches).

Based on a few calculations and your dimensions:

(W x H x Th.) x wt/cu. in.

32 x 18.75 x .3125" x .2833 lb./cu. in. = 53 lbs. steel per door.

The fun part begins where you place the counterweights and how far out you place them.

I think thats the numbers....

PA

Jason! Did you get that?

jestridge

04-11-2008, 06:51 PM

http://i255.photobucket.com/albums/hh128/jestridge/Smoker013.jpg

I put these on my smoker I WAG it (wild ass guess) they are 3x3 solid bar

OR....you could get one of those scales you can attach to the door handles and lift......see how much they weigh....then put about that much on the end of an arm.

Thats pretty much a WAG on how I'd do it

now you just gotta find some scales.

watertowerbbq

04-11-2008, 10:33 PM

There are a few simple factors when determining steel weight:

(all figures are rounded up... no need for 4 place decimals here.)

A. pi (times) diameter ... Therefore (3.14 X 24" ) = 75" around the barrel.

B. 75" divided by 4 = 18.75" of steel plate (curved surface)

C. Simple steel weight is .2833 lbs/cubic inch (times) your door (in cubic inches).

Based on a few calculations and your dimensions:

(W x H x Th.) x wt/cu. in.

32 x 18.75 x .3125" x .2833 lb./cu. in. = 53 lbs. steel per door.

The fun part begins where you place the counterweights and how far out you place them.

I think thats the numbers....

PA

Steel weights 490 lbs per cubic foot (easier for me to remember)

For determining the weight and location of the counterweight, you can use simple lever calculation.

For example, if you want to lift the lid with 15 lbs of force and the steel door weighs 53 lbs. Assume that you want a counterweight of 25 lbs.

15 lbs * 12" + 25 lbs * x" = 53 lbs * 6" Can you solve for x? (I can :-D)

x = 5.52"

Therefore, you would need to get a 25 lb weight located approximately 5 1/2" beyond the top of the smoker. I assumed that the hinge is at the top of the smoker. If it's not, that will effect the number. I would recommend tacking the counterweight to the smoker and testing it out before you make your final welds.

Mutha Chicken BBQ

04-12-2008, 08:18 AM

The Key to Counter wieghts on a door is to Not brake 6 degrees ( And not the Kevin Bacon thing)

If you place them Straight out the back, You will have help opening but then have to Pull down to get them to close. If you keep the wieght Within 6 Degrees of center, Or top towards the rear obviously. Then you actually get a double acting lever.

And to add to what Water Tower has stated, The farther or longer you move the wieght out the Less wieght you need, Lever Law.

Good luck And hope this helps

smoke-n-my-i's

04-12-2008, 08:59 AM

I am sure there is and hopefully some body will be along soon to help you out. I wish I could.... sorry.

Told you so.... did you get all of that good info.... I am still trying to soak in some of it.... :icon_sick

maybe I will copy and save it for later.... :wink:

jtfisher63

04-12-2008, 10:34 AM

Well, I asked for formulas and it sounds like I got them. After I wake up some more I'll reread all of this and try to figure out how to make it work. Thanks to all of you guys.

BBQ Bandit

04-12-2008, 10:44 AM

^^^^ what watertower said ^^^^^

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