Introduction : Cold Smoke Generator - Vent
This is an initial instruction on creating a vent for the smoke generator.
I have decided to break the instructions into a number of key parts which might just be useful components on their own. The vent is inspired by a well known bbq manufacturer.
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Step 1: The End Result.
This video shows the smoker during an initial test run.
Step 2: Parts
The aim is to use a few consistent parts
- 1 x M6 set screw 20mm long
- 1 x M6 nuts
- 1 x M6 washer
- 1 x M6 wing nut / butterfly nut
- 2mm x 110mm x 73mm sheet aluminium
**A gas canister or anything else that needs a vent**
Step 3: Tools
Think this is the minimum you will need
- 1 x drill (potentially electric)
- 1 x 20mm diameter hole saw (needs to be robust as cutting steel)
- 1 x 6mm drill bit
- 1 x 3mm drill bit
- 1 x angle grinder
- 1 x slitting disc
- 1 x hand file with flat blade
- 1 x hand file with a half round blade
- 1 x sharp scribe (sharpened nail worked)
- 1 x dividers or compass for drawing a circle.
- 1 x circular template (74 mm diameter paint tin)
Step 4: Cut Out the Vent
Cut out and bend into shape
- As the aluminium is relatively soft, just use a sharpened scribe to drawn out the shape directly on the metal. Use the compass for dividers to scribe out the circle.
- No simple options for this, but I tend to use an angle grinder with a slitting disc to slice the metal off in successive passes and then file down the shape.
- Clamp the aluminium to a piece of wood or chipboard so you can cut through the metal against something flat.
- At this stage you only need to drill a 3mm hole it the centre
- Place the lug part in a vice and bend the larger part as this seems to be easier. doing this now adds a bit of stiffness the to shape and makes it easier to handle.
It doesn't have to be perfect, it will get coated in wood tar on first use.
I have added a DXF file of the outline.
Step 5: Vent Placement
Guessing where to place the vent
- I used a paint tin to work out the best position for the vent
- Move the tin around until it stop rocking (needed to grind off an embossed logo)
- Draw around the tin
- Place the vent into position
- Make the centre point
- Drill out the centre hole first with 3mm drill and then the 6mm drill
- Then bolt the vent into position (align one of the holes it the top)
- Drill the remaining 3 holes with the 3mm drill
This should mean that the vent will rotate with an even distance around the edge, which is what you need to control the air flow.
Step 6: Drill Vent Holes
Using the hole saw drill the vent holes
- Remove the vent
- Drill the three holes in the cylinder with the hole saw
- File off any rough edges
- Clamp the vent onto something flat
- Drill the three holes in the vent
- File off any rough edges
Step 7: Finished
At this stage I bent to vent by hand to follow the curvature of the cylinder. Just placed thumbs near the centre and bent the edge in the opposite direction working around the edge a few times.
- Just pass the bolt through the washer and vent
- Then the hexagonal nut and wing nut on the inside
- Tighten the wing nut so that the vent will just spin