Forced air burner tuning

Ok, thanks. How much will I need to worry about heat on the wires?
whoops, just saw your post Bladsmth. Thanks.
 
Steven, is it running yet?? Yup the TC is inserted from the wrong side. I use an orifice on my blown forge. I went without one for a while and found it harder to control. Now with the orifice I can set the forge to a given temp and it will hold without a PID. As you saw when we had the mini hammer inn the forge ran by itself for 1.5 hours and was still only 25 deg hotter. Slight adjustments might be needed but it's not to hard to get it set and be able to let it run. I do have a mixer in the end of my nozzle. I have used 2 types, one was a propeller shaped circle welded into the face of the nozzle. The second is a series of stainless tubes that I welded together with a slight twist to cause a swirl. The second one works better but either will work. I have even used straight pipe and it worked just fine. Just had a few more burn backs to deal with.
 
What kind of orifice are we talking about, where can I get one and how much will it cost?
BTW, I switched it to the other side. thanks for the advice.
 
The orifice necks down the gas flow and makes regulation a bit easier. This is because the needle valve can be opened more to regulate the flow. In an open pipe ( no orifice) gas feed to a smaller forge, the needle valve often is just barely cracked to run at 1500F.
The orifice also injects the gas at a higher speed to insure better mixing with the air.

Any size small hole will work, you don't need to buy a special size orifice. You can plug the end of the 1/4" pipe that the gas comes in with and drill a .050-.100" hole in the center...or tap the inside of a 1/8" pipe to fit a #52 or #68 MIG tip. You will use higher gas pressure readings with the orifice, and that is OK.

I was not saying an orifice is a bad thing, I was just saying that it isn't necessary in many cases. The bigger the forge, the less the need.
 
I soldered the end of the copper tube and drilled a hole in the end. No actual orifice, That way you can also tune the system by drilling a larger hole if it will not get hot enough.
 
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