Thread: Hot & Shiny WIP

What do you expect the finish ID of your forge to be? I assume you are lining it. Also what size orifice are you going to use on the burner? I just built a 3/4 burner with a .030 mg tip accelerator and I can hardly believe how powerful it is. I have not really experimented much with it turned down or with an .023 tip.

EDIT; Just re read your post and saw that you did state the finished size as 3" x 15". I have no experience with a 1/2" burner, but I suspect it would be more appropriate for your mini forge.

I want to see the finished product.

I used a piece of 1-1/4" pipe for my nozzle. 1" seems like it would be too small to me on a 3/4" burner.

Originally Posted by bluesman7

I used a piece of 1-1/4" pipe for my nozzle. 1" seems like it would be too small to me on a 3/4" burner.

was your tip conical or just square cut
I have seen some machined on the inside to 5° helps as well as some that just use a 3/4" to 1" reducer for the tip and nothing else ?

Originally Posted by Substance

was your tip conical or just square cut
I have seen some machined on the inside to 5° helps as well as some that just use a 3/4" to 1" reducer for the tip and nothing else ?

Mine is not flared. It is just a straight bore with a step at the end of the 3/4" mixing tube. I gather that the idea here is to reduce the velocity and that the step actually helps by introducing turbulence into the larger diameter.

Very, very nice!

todays Progress another hour spent on it before it got dark
trail fit with threaded rod, ready for mounting of bolt flange lugs & the burner stab






internal view of stab end shaped to suit the inner walls shape


Flared my tip then ground the outside to fit my stab pipe
1 practice / spare and the finished item
amazing what you can do with a 50t press and a ball peen hammer




stills need a clean up but a step closer
may get to tacked it up tomorrow arvo if work doesn't get in the way

hopefully this video works of the burner running

https://youtu.be/nBQ_IjqG1vY

Originally Posted by bluesman7

What do you expect the finish ID of your forge to be? I assume you are lining it. Also what size orifice are you going to use on the burner? I just built a 3/4 burner with a .030 mg tip accelerator and I can hardly believe how powerful it is. I have not really experimented much with it turned down or with an .023 tip.

EDIT; Just re read your post and saw that you did state the finished size as 3" x 15". I have no experience with a 1/2" burner, but I suspect it would be more appropriate for your mini forge.

thanks mate, I intend to make it so I can change tips out so may start with the smaller & try them before I mount it to the forge anyway.

also do you know if the length of the burner pipe has any effect on performance ??
I have it at 8" of pipe from the shortest point of the throttle holes to the burner pipe end this is square cut

Then the throttle slots will be 4 off at 1/2" x 2 1/2" long this make it 80% of the internal circumference is open x 2 1/2" long

The nozzle tip is adjustable & 2" long this is square cut

The outer mount tube is 3 1/2" long and will be shaped to suit the inner wall of the forge

thanks for any info in advance.

Originally Posted by Substance

also do you know if the length of the burner pipe has any effect on performance ??
I have it at 8" of pipe from the shortest point of the throttle holes to the burner pipe end this is square cut

.

Mine is 7" here. I've only built the one so I don't know how much effect that extra 1" will have. As I said I used an 1-1/4" nozzle and I find it runs well with 1-3/8" overhang. This keeps the primary flame wide and short.