Author Topic: Cyl drain cocks.  (Read 4595 times)

Offline Firebird

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Cyl drain cocks.
« on: December 14, 2012, 09:01:50 PM »
Hi

I didn't want to post this in Stews Topic so i started a new one. I'm thinking of having a couple of drain cocks on the cylinder of my portable engine. I came across these on e bay. They have a 3/16 x 40 thread.



At only ?15.00 for the pair I'm wondering if its worth the effort of making them myself but then again I hate paying for something I could make.

Any info on how these work or could be made would be appreciated.

Cheers

Rich

Offline Jasonb

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Re: Cyl drain cocks.
« Reply #1 on: December 14, 2012, 09:11:58 PM »
Just the usual tapered spindle in a matching tapered hole, cross drilled so a 90deg turn will open or close the cock.

You really want a very small pipe union on the outlet so the steam/water can be run in a small bore copper pipe down teh side of the firebox.

J

Offline tel

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Re: Cyl drain cocks.
« Reply #2 on: December 14, 2012, 09:34:42 PM »
T'were me, I'd be snapping them up Rich - that's a good price for a fiddly-to-make item
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Offline Bearcar1

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Re: Cyl drain cocks.
« Reply #3 on: December 15, 2012, 02:15:59 AM »
I dunno Rich, after being witness to your caliber of work, I wouldn't think that doing up a couple of these little beasties would present that big of a problem. I'm not saying it would be a walk-in-the-park, but it should be no more difficult than some of the other thing you have labored to make. Some silver steel ground to shape would make for a good taper reamer.....  I guess it depends on how anxious I would be to get things done weighed against the cost.. hmmmm.  :stir:  Ah Hell, go for it. :happyreader:


BC1
Jim

Offline Firebird

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Re: Cyl drain cocks.
« Reply #4 on: December 15, 2012, 09:04:08 AM »
Hi

Your powers of persuasion got the better of me Tel,  :cheers: so i have ordered some. I may be able to tap the hole in the end to attach a pipe to. At least I will have something to strip down and measure. When they arrive I'll show some more pics. Jim, I'm sure I could make some but looking at them I would need to make  a taper reamer like Jason has said and a form tool to make the ball shape + acquire the materials sooooooooooooo :thinking: :thinking: I'll see.

Cheers

Rich

Offline zeeprogrammer

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Re: Cyl drain cocks.
« Reply #5 on: December 15, 2012, 12:29:41 PM »
When they arrive I'll show some more pics.

I'll be looking for them.

I'm sure I could make some but looking at them I would need to make  a taper reamer like Jason has said and a form tool to make the ball shape + acquire the materials sooooooooooooo :thinking: :thinking: I'll see.

If you do (and I for one am hoping you do), lots of pics making them please. There's never enough info and help in making valves. And like what's been said below...you do great work.
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Offline Firebird

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Re: Cyl drain cocks.
« Reply #6 on: December 15, 2012, 04:30:31 PM »
Hi

Carl I'll certainly strip one and take some photo's and measurements. Still not sure whether or not I'll make some though.

But now you have raised the subject I have made a few valves, pressure, regulator, check etc and also a couple of displacement lubricators. If there is enough interest I could dig out some photos and show how I made them.

Cheers

Rich

Offline Dave Sohlstrom

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Re: Cyl drain cocks.
« Reply #7 on: December 15, 2012, 04:58:43 PM »
For reaming the tapered hole just build a tapered D bit. Turn it at the same compound setting when you make the tapered plug for the valve. Then just a touch of lapping and they will fit like a glove.

Dave

Offline Firebird

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Re: Cyl drain cocks.
« Reply #8 on: December 27, 2012, 08:05:20 PM »
Hi

Well they arrived and they are small.



I don't think I'll even try to make some, I can barely hold the little b****** let alone make them :Lol:





Cheers

Rich

Offline tel

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Re: Cyl drain cocks.
« Reply #9 on: December 27, 2012, 08:15:11 PM »
They look to be well made - and very easy to fit discharge pipes to! Good buying.
The older I get, the better I was.
Lacerta es reptiles quisnam mos non exsisto accuso nusquam