Does anyone know what the thread details are on the Indian burners? I don't think it is standard thread size, but I could be wrong. I need a tap and die for it. Thank you.
I think if you search it, there was a thread about this awhile back. If memory serves, Kerophile contributed to it..or started it.
Most burners have a unique thread. I have pair of Indian silent burners. They have slightly bigger diameter (~0,2mm) than thread on Swedish burners. I do not know if it is because of production quality (they was sale with discount), or it is an "Indian standard". I can screw it in on about 2.4 rotation instead of Optimus burner, but than it becomes very tightly, so I stopped. Most close metric thread is M14,7x0,75mm, but there are not such standard tap and die.
I need the female fitting into which the burner threads into. I have sent a message to the supplier to see if it is available. This is for a special project. Will advise if he responds favorably. I am not hopeful.
I also work on some special project, but I have female fitting with metric M14x0,75mm. Metric tools is more common at my site, so I rethread the burners with M14x0,75 die. But first, I reduced their diameters from 14,7mm to 13,8mm with file. Traces of existing threads was used as guidelines to ensure shape equality. But for your project, you may get pair (tap and die) with most closest imperial thread, and just to fit the indian burner thread with die. And use tap for making female fitting. Unfortunately, I could not advise on imperial thread sizes.
There are a couple of Chinese sellers knocking out taps at M14.5 x 0.75 on UK ebay, so it seems to be some kind of standard. That's 34-ish tpi, which does not ring any bells in Imperial - it's too fine for a brass thread and it's not BSP. Here's another thread about that https://classiccampstoves.com/threads/14-5-x-0-75-metric-tap-for-stove-burners.31215/ An idea - I bought a new cross-slide feed screw nut for my lathe, and it came much too tight. The idea was to introduce it to the (worn) screw and lap it in to size with lapping paste. Lapping brass into brass sounds like a right pain in the **** and perhaps a recipe for disaster, but OK, why not? Or - find someone with a lathe which can cut metric pitches and get them to take a tiny cut with a single point tool. It's not so hard to set up to align with a thread which is already there, even a fine one.
The screw threads on Swedish stoves (which other manufacturers copied) are not British Imperial. The thread is one devised to be different from any other thread and so hard to copy - which you have found!
