Offset Smoker Plans, Any Size, Metric and Imperial, with Sizing Calculator

Build an offset smoker the size you actually want.

Most smoker plans give you one smoker. This set gives you the drawings and the calculator that sizes them, so you can build around the pipe, tube or tank you can actually get hold of, instead of hunting for the one the plans were drawn for.

HOW IT WORKS

Open the Excel calculator and type in your cook chamber. The workbook works out the firebox, the throat opening, the chimney length and the number of air intakes, then gives you the cut list and the steel to buy. Change the pipe diameter and everything downstream changes with it.

The ratios are the ones pit builders have settled on over years of building, burning and rebuilding: firebox at one third of the cook chamber, throat opening area at 0.008 of the firebox volume, chimney volume at 0.05, intake area at 0.003. This set applies them consistently and shows its working on a dedicated sheet.

WHAT YOU GET

• 9 shop drawing sheets in metric (A4, millimetres)
• The same 9 sheets in imperial (US Letter, inches)
• 16-page assembly guide, also in both unit systems
• Excel sizing calculator with 6 tabs, metric and imperial

DRAWN SEPARATELY, NOT CONVERTED

The metric and imperial sheets are two different drawings, not one converted into the other. A European welder cuts 500 mm, not 508. An American welder cuts 20 inches. Two of the sizing ratios carry a unit, so each set uses the correct constant for its own units.

NO SPECIAL KIT

No CNC, no plasma table, no rolling machine. A grinder, a welder and a drill. Works from pipe, from tube, or from a cut-down tank: the calculator takes a tank volume in gallons or litres.

THE GUIDE, NOT JUST THE DRAWINGS

The 16-page assembly guide covers what drawings cannot: how to mark a curved cut on a cylinder, why you weld the door frame on before you cut the door out, how much gap a door should have, a weld map of which joints must be sealed and which can be stitched, how to keep the chamber from pulling oval, and burn-in and first fire.

THE JOINT MOST PLANS LEAVE OUT

A firebox is square and a cook chamber is round. On a chamber of this size the bottom corners of the firebox fall outside the chamber circle, so on a round end plate they have nothing to weld to. This set draws the fix: a rectangular end plate at the firebox end, with straight cuts and flat welds. There is a whole sheet on it, with the order of work.

SKILL LEVEL

These are drawings and a calculator, not a welding course. You need to be able to cut, fit and weld steel. Build to your local rules and wear the right gear.

LICENCE

For your own use, including building smokers to sell. Please do not resell, share or redistribute the files themselves.

THIS IS A DIGITAL PRODUCT

You are buying PDF drawings and an Excel workbook. Nothing is shipped. You get the download link on screen and by email as soon as your payment clears, and the files are yours to keep.

Questions before you start? Email contact@arcandsaw.com, happy to help.

ARC & SAW

Plans drawn from things that were actually built.