MTFCA Forum

Was working in my shop today and this came off of my lathe...

it's about 5/8" long and 9/16" diameter

Does anyone know what it is?

Need a sense of the scale of it.

It’s obviously a part for a rare and expensive carburetor

Looks like a seat for a NH Carburator spray needle but don’t think so.

Jeff

it's about 5/8" long and 9/16 diameter

It’s the mixture screw cage for a Stromberg of

BINGO!

Give that man a prize!

(it goes on pretty much any Stromberg of the era)

Scott, how did you form the ridges on the inside?

Allan from down under.

Allen

with a lot of thought, planning and some specialty tooling.

Some time back, by coincidence, Stan Howe mentioned that he'd like to get some made and felt that perhaps 3-D printing was the way to go. Finally needing one, myself, I spent a fair amount of time figuring out how the factory would have made these things by the thousands, quickly, and that imagined method is the path I chose. My enjoyment in this phase of the hobby is doing things that either "cannot be done" or no one is doing it...believe me if someone was making these things, I'd be buying from them, because the time, materials, tools, fixtures involved are ridiculous relative to the return. Still, that expense buys me the satisfaction of having done it, and that's what I'm after.

Those buggers are threaded in!
I wondered if pressed in. The M-3's I have are formed for the detents.
Beautiful work, my goodness! Drooling......
How to keep from scratching them on install?
Actually glad I did not see this a few days ago when fussing with a plugged venturi M-3. Else I would've tried to unscrew the high speed to remove the jet below to look/check.
Thank you!

Dewey

All Strombergs have the formed wells in the beginning, which are very prone to cracking and have only 1/2 the possible rotational positions (8) of the later machined versions (16).

As for screwing them in without damaging them, I have made a special wrench to fit them which works perfectly.

Whoa. Cool.
Thank ya sir!

Scott, you should go into politics. Your non answer to a direct question is an admirable example of the way they treat us. I don't have the skills or the machinery to do what you have done, but I do have curiosity and interest in how things are done.

That same article on my OF's is ridged on the outside, as well as the inside. I suspect it was produced using dies and some kind of press. I was interested in how you managed to make the ridges on the internal side of a blind hole.

Please excuse my temerity in asking. I will endeavour to curb my curiosity in future.

Allan from down under.

My, non professional, machining experience would lead me to a relatively simple broaching process.
The broach would need a fair amount of relief behind the cutting edges.
The OD on the part body would be much heavier to prevent splitting during the cutting press & OD thinned last.
Am I in the ball park? I am also interested in exactly how you did it. Another beautiful part. Much respect!