How To Easily Make A Simple DIY Gas Forge from A Coffee Can - Five Makers

How To Easily Make A Simple DIY Gas Forge from A Coffee Can

The Need For A Simple DIY Gas Forge …..

I’ve been experimenting with making knives for a while now and have needed to upgrade my forge from the borrowed mess that I’ve been using recently.
A friend suggested that I had a go at making my own and I found this great design by CLKindred on You Tube that fitted my brief pretty well.
1 – Cheap.
2 – Already have materials needed.
3 – Easy to follow instructions.
Here’s how it goes…


Step 1 – Select your can and some nuts and bolts for the legs

Via CLKindred on YouTube

Depending on how big you need your forge, you will need a large can and some bolts to make the legs with

Step 2 – Mark and then cut the holes for the legs.

Via CLKindred on YouTube

Use a drill to cleanly cut holes in the side of the can for the legs.

Step 3 – Fit the legs to the can

Fit the legs and adjust so the can sits stable on the bench- you won’t want it to wobble around when being used.

Step 4 – Drill the hole for the burner

The size of hole here will depend on the sort of burner tip you use.This maker has customised his own but you may want to use a plumbers torch. You may need to modify it to fit.


Step 5 – Test fit the burner tube

Via CLKindred on YouTube

When happy with the type of burner you are going to use, check it fits in the can as once you start adding refractory materials, it will be more difficult to adjust to fit.

Step 6 – Mix the refractory material together.

In this case perlite and sodium silicate with a little plaster of paris as a hardener/accelerator


Step 7 – Put a layer of the mix in the bottom of the can and tamp it down.

Via CLKindred on YouTube

This will form the base or back of the forge


Step 8 – Build Up The Side Material.

Make small batches of material. With the burner tube and a centre form in place, build up the sides until you reach the top of the can.

Use small batches at a time as this will allow it to remain workable while you press it into layers.

Step 9 – Make the burner assembly

Via CLKindred on YouTube

Step 10 – Fitting the burner assembly into the forge and firing her up.

Via CLKindred on YouTube

The fully assembled burner ready to be attached to the gas supply. You may need to attach a tube so the gas is well away from the furnace when its being used.

Step 11 – Heats up pretty quick.

Via CLKindred on YouTube

Check that everything fits and works ok then fire up the furnace to harden off the refractory material

Step 12 – Make up some fire cement.

Via CLKindred on YouTube

Using Sodium Silicate, aluminium oxide abrasive powder, and magnesium silicate in a disposable container.

Step 13 – Spread the mixture onto the surface of the refractory material.

Via CLKindred on YouTube

Start doing the inside first like spreading butter or frosting.

Step 14 – Then seal off the top or front of the forge.

Via CLKindred on YouTube

When its set you can heat it up with the burner to finally cure the fire-cement.Propane will burn pretty hot – about 3500 deg F so will easily melt steel enough to bash it on an anvil. 

Making a crucible out of similar refractory materials will enable you to melt small quantities of other metals too.
You can do this using the same technique as making the forge but using a small tin as a mold.

You can watch the whole video by CLKindred here


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