looks mean... i made 1 a similar size....made the mistake of buying a smaller pump like the first you used.. have you given it a full burn?how long does it last?

Hey Blair...  great ingenuity made from a few simple parts... I have a stainless steel smoker similar in size to a bradley which uses gas heat under a cast iron hot box to produce the smoke... It works well but I want to produce a lot more smoke so want to make a similar device as yours and drill a hole in the side and mount/bolt it on it externally..  Give me the best of both worlds... heat and more smoke...

nvmyvl wrote: Hey John, I have a mate that came round tonight who is a stainless welder. He is gonna make me up a sample the same design as the "smoke cannon" from trademe. but a bit different so i dont get in trouble hahaha. When its made up i could flick it up to you for testing if you want. Then he could make some more for me as well. I will check that it works first tho as this one i have already built took a bit of fine tuning to get running right

I made a copy of the 1 of Trade Me also kinda works you need a venturi in the outlet tube which you dont see in the photos. Hope that little bit of advice helps.

Hey John

nvmyvl wrote: then made up the smoke spout. this was made out of a 15mm copper 'T' section and a couple of pieces of 15mm copper pipe. one end of the copper pipe had a venturi pipe put in it to produce the vaacum for the smoke box and top tube.

I just took photos of the 1 on TM and made a copy. Mine works just but needs a venturi down the outlet pipe. I aint yet put a venturi in mine just been to busy and it still in boot of the car. I am sure if we all put our heads together we should get 1 that pumps out heaps.

Ok here goes

Tagit, the theory behind the venturi, is that it will produce a vacuum there fore increase the airflow. this air comes from behind the venturi tip. Because the air comes from inside the tin where the wood chips are smouldering, then smoke is pulled from the tin. also the vacuum creats an airflow thru the holes in the bottom of the tin and keeps the chips smouldering.

Here are some photos of the final venturi tube and setup for the top of the tin. I will be getting my mate to weld up a new chamber as this old coffee tin is a but light weight. The new one will be made from stainless tube.

These are all the parts. As you can see there is not alot to it.


This is the venturi tube that I turned up from brass.


Venturi tube pressed into the "T" Section


This is the back side of the venturi tube. the hole is just big enough to push a standard clear pvc tube that comes with the air pump into.


This shows how far out the venturi tube comes past the bottom section of the "T". I had a bit of trouble with smoke flow so shortened it to this length. To long and the vacuum is produced to far away from the "T" section and will not suck the smoke out. to short and it will cause the airflow to go back into the tin and cause flames to come out the bottom of the tin instead.


Here it is all put together.


And sitting in the tin ready to hook up the air pump and light to produce smoke.




And since then I have been working on a new design. This one is more like the ones that have been for sale on Trademe. Made out of 40 X 40 ali SHS at the moment, but I am waiting on a Stainless one that will be 75 X 75 SHS.


Started off by cutting the tube and folding one of the sides over so that it made the base for the tube. Drilled 2 holes for lighting the wood chips. 1 larger hole for the smoke tube and a small hole for the venturi tube.


Then made up a venturi tube to screw into the back of the tube


Screwed it into place. Here you can see that the end of the venturi. There is about 12mm sticking out. Any shorter and i found that i was getting wood chips being blown out the smoke tube. Worst part was that they were still glowing.


Then put the smoke tube in.


And all ready for use. I have found that the brass hose tail on the venturi gets bloody hot. The standard pvc hose softens up to much and comes off sometimes. I will fix this problem by using silicone hose, which can be bought at the pet shop as well.


Here are some video's that i took of the square tube smoke generator.

Smoke flow is great. It was quite windy when i took these video's

Smoker 1

Smoker 2

Smoker 3

Smoker 4

In the smoker 3 video, you will notice that it backfires near the start. I think this was caused by the Short Venturi tube i had in there. And also the wind blowing past the end of the smoke tube would of been pushing back into the embers causing the flame to pop out the ignition hole.


And here it is filling a cabinet up with smoke. This was about 1 minute of smoke

Smoker Cabinet

Thanks for that nvmyvl. Will have to have a play with the tools and see how I get on.

QUOTE||Then made up a venturi tube to screw into the back of the tube

Is there any chance you guys could let me know where to get my hands on one of these? Have had a look and proving to be harder than I thought.