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I need a brazing hearth and after look around at what I could buy I settled on making one.
The core of this build is fire bricks for a wood stove. You can buy sheets of Vermiculite online, but I saw these on ebay and after a rough sketch with regards to size they looked just the job.
Vermiculite Villager Stove fire bricks 9"x4.5"x1"(230mmx114mmx25mm)
The fire bricks were roughly £25 for 10off which is enough to make 2 brazing hearths.
I decided to use long woodscrews to fix the bricks together.
I′m a tad worried that the screws will get hot and expand, this may move the bricks apart, but this is a try and see.
The bricks are a bit lick very soft chipboard in texture and have a tendency to flake, this means you do have to be careful drilling and tightening screws.
As you can see from this measurement the core of the screws are just over 3mm in diameter.
I pre-drilled the holes with a 3mm drill bit to try and mitigate any tendency for the screw to split the vermiculite.
Deep threaded woodscrews go into the fire bricks really well and you can tighten the screws and they appear to get a good purchase.
2 screws in each corner.
I countersunk eack screw using a normal countersink bit that you would use for wood.
I trimmed one of the bricks down and used this part at the top of the hearth as a trap for when I need to get a lot more heat into the work piece.
The base is raised 1 brick thickness high, I did this to give strength and to all air to circulate underneath, might be a problem with large or heavy parts - will see how this works over time.
Nice and simple design with a fire brick each side, the rear brick goes between the sides and is fixed to the sides with 4 screws.
This view allows you to clearly see the screws holding the base bricks.
The result is rather cool, now need to see how well it performs over the next couple of months and will let you know.
Price: approx £25 - you can make two hearths for this price.
Cheap to build, roughly £12.50 per hearth plus a few woodscrews.
See also: Tools