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Brass taper plug cock dimensions

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David Hill 521/02/2019 13:17:32
18 forum posts
1 photos

I need to make some taper plug cocks for my large steam engine and am wondering what sort of taper to use. Obviously too fine and it will jamb. I was wondering about using a taper pin reamer that has a 1/48 taper. Would this be too fine?

Thanks for any help.


JasonB21/02/2019 13:38:30
15171 forum posts
1548 photos

I think around 7-10degrees included angle would be better, your 1:48 will tend to lock.

best to make a taper reamer at the same setting when you turn the spindles

Maurice21/02/2019 14:27:31
431 forum posts
50 photos

Jason; I do like the look of your taper plug cock! Is the body a casting, filed/milled from solid or two pieces silver soldered together?



JasonB21/02/2019 15:22:53
15171 forum posts
1548 photos

Cut from a bit of 5/8" square, I did later solder on the threaded drain pipe connection

David Hill 521/02/2019 17:07:43
18 forum posts
1 photos

Gosh, that looks superb. Excellent suggestion Jason about cutting the plug and a D reamer on the same setting. Just a question about the D reamer, I guess that you used reasonable hard steel but did you heat treat it?


Brian H21/02/2019 17:57:42
1070 forum posts
84 photos

Magic! They look good Jason and by chance I have to make a pair myself, but without the drain pipe connection.


JasonB21/02/2019 18:26:48
15171 forum posts
1548 photos

Silver steel, hardened but did not bother to temper.

David Hill 521/02/2019 19:02:27
18 forum posts
1 photos

Great, thanks Jason.


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