Rob Roy loco

[Ian Horsfield 1Participant @ianhorsfield1]

Many of you who have made Rob Roy will have encountered the problem I now have.-Can you help me?

I have made the steamchests 11/16 thick with the height for the valve spindle 7/16 as orig sht2 drg. The general assembly of the slide valve and cylinder shows this 7/16 dimension but it is drawn at 5/16!!!!. I have also made the slide valves 1/2 thick and upon assembly the bottom face of the slide valve is 1/8 away from the port face of the cylinder. Should I reduce the thickness of the steam chest by 1/8?

Looking at the book I now see that the slide valve nut has grown from 1/4 to 3/8 and the height of the valve spindle hole to .240. (Should this be .250?)

If I make new slide valve nuts that will give me the 1/8 I need. What do you think?

Any help would be appreciated before I make more swarf.

Thanks

-Ian

[Ian Horsfield 1Participant @ianhorsfield1]

Help with drawing errors? – Steamchest and slide valve thicknesses

[Steve FParticipant @stevef]

Hi

I remembered seeing this here **LINK**

I hope this helps

regards

Steve

[Author]

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