Making a Stem

[jdrichard]

I am planning on making a stem for a repair I am doing. I have done the measurements but would love some tips on what to cut first. I just got a carbide tip graver with a refill tip and some stock steel. Here is the part and my measurements,

Taping could be a challenge as this is new to me.

 

 

Sent from my iPhone using Tapatalk Pro

[oldhippy]

Start this end and work your way along. For you to get the perfect square you will need to use indexing on your lathe. Be careful when taping the thread use grease or oil as it is very easy to snap it off

[frenchie]

May be a dumb question, but would it make any sense to tap first, and then start the turning? It would suck to get all the cutting done just to end up snapping the stem when you're taping it...

[oldhippy]

Providing you have enough room left for the stem. I can’t see a problem. I just pointed out the way I used to make them.

[jdrichard]

Start this end and work your way along. For you to get the perfect square you will need to use indexing on your lathe. Be careful when taping the thread use grease or oil as it is very easy to snap it off

Big thanks OH


Sent from my iPhone using Tapatalk Pro

[jdrichard]

This is the movement I am making the stem for (ending sentence with a preposition). EA 1950/51




Sent from my iPhone using Tapatalk Pro

[jdrichard]

Progress so far

Still need to tap the threads and perhaps smooth things up a bit


Sent from my iPhone using Tapatalk Pro

[oldhippy]

Its coming along. Is it the reflecting on the stem only the square doesn’t look right.

[rogart63]

Why make a stem for a AS1950/51 . Are they hard to find? Or is it just for fun or getting some experience? 

Almost sure i have a AS1951 stem? 

[jdrichard]

Why make a stem for a AS1950/51 . Are they hard to find? Or is it just for fun or getting some experience? 
Almost sure i have a AS1951 stem? 

I am just learning. 18S pocket watch stems are hard to find so I figure i will get some skills:)


Sent from my iPhone using Tapatalk Pro

[jdrichard]

Ok, update. I broke the stem trying to die the threads. So i have started again. Here is the progress. PS I have ordered a double roller guide for filing the square.
Still need to carve out a small step, add the square gap and make the threads. Not sure if i need to heat up the steel to soften it prior to tapping. I am using tempered blue steel.


Sent from my iPhone using Tapatalk Pro