Thread: Hot & Shiny WIP

Finally scavenged about 90% of the parts for my mini forge
& since it was available I decided on a full stainless option would be nice
So started building today
body is 6"x15" long sched 10 pipe cut the hole for the burner also ( forgot to take a pick)

6mm end plates with 80mm opening & 100mm wide back door flap cut & drilled

Pieces of 6mm plate for a cover door with 1" slot (was 2 shims cut) and my lugs so the ends can be bolted to the body



cut drilled & tapped burner body, guide end, stab in & throttle slide pieces
still have to slot the throttle air vents
burner body is 3/4" sched 40 pipe
tip & throttle slide is 1" shed 40 pipe
stab guide pipe is 1&1/4" shed 5 pipe


Other bits and pieces in my office for most of it ready to go (no pics) including valves & bits for an idle loop & gas supply mig tip jet set up,
also from a long time work associate a piece of Superwool 607 blanket 1" thick 2'x4' and some refractory cement getting saved from a shut down next week

The best bit is the total cost to date is not $300 not $100 but ZIP ,nada yes that's it $0 only my time which means more coin for my grinder build to come.

Now My question for those who have already tread this path is:
do you think the 3/4" pipe burner is going to be too big for my size forge at a 3"x15" volume forge or should I drop down to a 1/2" body burner ??
hope you enjoy
regards Dion

I know nothing about this, Dion, but that is nice work. Cannot wait to see it done!

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 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.

Quick question: do you guys use any thread sealant on the mig tip? Obviously the rest of the fittings are airtight but if the mig tip gets hot it probably shouldn't have Teflon on it, or am I wrong?

Originally Posted by Atchbo

Quick question: do you guys use any thread sealant on the mig tip? Obviously the rest of the fittings are airtight but if the mig tip gets hot it probably shouldn't have Teflon on it, or am I wrong?

I have Teflon on mine. My mig tip never gets hot. It's pretty far from the flame and the forge, plus it has high velocity propane gas going through it that is colder than ambient temperature due to the phase change at the tank which is endothermic as well as flowing ambient air on the outside that is being pulled in by the accelerator.