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Stuart S-50 build problem

Cant drill the hole in the valve chest

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Jim Beagley02/10/2020 19:14:48
103 forum posts
52 photos

Hi all.

I'm a long way into my first build of a steam engine - an S-50 - and thoroughly enjoying it, but I've just hit my first issue making the valve chest and wondered if there was an easy solution.

The plan calls for a 0.07" hole in the far end of the chest from the rod entry, for the end of the valve rod to ride in (this is incidentally wrongly dimensioned as 0.7" on the plans - I wonder if anyone ever tried that).

So the problem - there no way that my 1.8mm drill is going to be long enough to reach through the chest and drill this hole.

I could drill it bigger and fit a bush, but is there something simpler I'm missing?

Thanks all.

alan-lloyd02/10/2020 19:20:54
170 forum posts

Phone Tracy Tools and order a long series drill

JasonB02/10/2020 19:27:24
19178 forum posts
2107 photos
1 articles

Another option that you may just get away with though easier if you drop down to 1/16" or 1.5mm is to drill the end of some 3/32" rod with your drill and then Loctite it into the hole which gives you a long reach drill. Gentle heat will get it back out again.

A few other options in this article hidden in the depths of the ME site, changing the pdf number will give you all the parts of the article

Jim Beagley02/10/2020 20:10:20
103 forum posts
52 photos

Thanks for the ideas and the link to the article.
(I had seen the Tubal Caine article mentioned in various places but I wanted to go on my own to see if I could - stubborn me).

I'm not sure that I'm comfortable with that thin a drill over that distance so I may go with my initial idea of a bush.

Thanks all.

Jim Beagley17/10/2020 23:40:46
103 forum posts
52 photos

I’ve now finished my first steam build, my Stuart S-50.
Heres the finished model. Hope you like. Comments gratefully received.


Oldiron18/10/2020 10:54:30
564 forum posts
22 photos

Very nice looking job Jim. Have you tried it on air or steam yet ?


Jim Beagley18/10/2020 12:27:45
103 forum posts
52 photos

Hi OldIron.
yes I’ve run it on air successfully. There’s a bit of a knock at one end of the stroke but being a novice I’ve not got enough knowledge to know what’s causing it immediately.

Sadly I don’t have a boiler to steam it on which would be ideal.


Steviegtr18/10/2020 12:49:59
1666 forum posts
207 photos

That looks great Jim. Well done.


Jim Beagley18/10/2020 15:50:41
103 forum posts
52 photos

Thanks Steve.

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