Member postings for Scott Murray 1

Hi,

I am ready to start machining the eccentric strap for the Stuart 10V. Is there anything in particular I should be aware of/watch out for? For example I notice the arm of the strap is cast slightly off centre to the main bearing end that locates the eccentric sheave.

Scott.

Stuart 10V

Hi,

Would brass be a suitable material for the piston and valve rods for the Stuart 10V?

Scott.

Hi,

Thanks for the resposnses. I'm afraid though that the compression of the o ring and the calculation thereof means very little to me. It's something I need to read up on. In the meantime I shall use the size that you have given and see how I get on.

Thanks again.

Scott.

OK. Thanks for that.

Scott.

Hi,

I am still machining the Stuart 10V. The valve rod and piston rod specify "stainless steel" on the Stuart drawing. Can anyone advise if it would be OK to use mild steel?

Thanks in advance.

Scott.

Hi, I'm considering using an O ring for the piston on the Stuart 10V I am currently machining. Can anyone advise what size O ring I should use. Also what size/depth of groove would be required in the piston.

Scott.

Hi, Sounds interesting but although I am a time served turner/machinist (more years ago than I care to remember) I need to learn to walk before I can run. Actual machining doesn't present a problem but I need to get my head round the build, alignment and workings of model steam engines. I've still to find out the principle of how steam engines work. I'm sure if I manage to complete it I will take up the challenge of the reversing gear.

Thanks Scott.

OK. The penny has dropped. Thanks everyone for all your help and patience.

Scott.

Hi everyone, Thanks for these replies. They help tremendously. I now understand the importance of the relationship/fit between the web crank faces and the main crankshaft bearings.

One thing I forgot to mention though about the crankshaft bearings. The turned O.D. dimension of 27/64" at either end have lengths of 1/8" and 5/32" I am assuming the 1/8" dimensions are positioned on the inside of the soleplate!!.

Thanks again,

Scott.

Hi, I am brand new to this Forum. I bought a Stuart 10V Kit (unmachined). I also bought a book "Building a vertical steam engine from castings by Andrew Smith" revised by Pengwern. I notice that the outside dimension of the crank web on the Stuart drawing is 5/8" and in the book it is 11/16". Has anyone else come across this? Also, when the engine is assembled do the outside faces of the crank web run against the inside faces of the crankshaft bearings.