Governor for the Muncaster engine

I am to make a small Governor the Muncaster type, I found the drawing under steam model 8, discussing governor and control gear. What I don't understand is the drawing of the governor lower sliding yoke which is attached to the leaver, It shows the lower yoke attached to the leaver by a spigot, if that is so then how will the spinning action work then raise the leaver. I've looked on the internet for a detailed drawing which would explain this but cant find any.

Thanks Bob.

Do these drawings help at all, pages 24 and 25 of the document.

**LINK**

Bob, I assume you are looking at the Westbury series of articles about teh Muncaster engines. If so his drawing does not show the governor as it is in Muncasters book, the two right angled levers push against the head of the spindle and move the whole thing away from the end of the shaft that the spindle is screwed into. Will post a pic for you later.

Here is the better drawing from Muncasteres original book which is still available from Tee Publishing for about six quid.

Hopefully you can see that the screwed in spindle has a larger flat head that the two governor arms push against. This will cause the whole sleeve/spool to move up the spindle away from the shaft that it is screwed into. If still not clear let me know and I'll see if I can do a 3D one.

Edited By JasonB on 03/05/2018 15:38:57

The drawing I was looking at is on Brian Sweetings link on page 779. The lever on the lower yoke on a spigot, its more than likely me not understanding the drawing.

Thanks Bob.

OK its the other governor. The lever pivots on the central boss, the rod on the right hand end goes to teh steam valve. As the spool (part with the groove and lower ball arm fixing) moves upwards that moves the left end of teh arm.

There are a few ways the arm locates in the spools groove. If you look at the previous page there is a ring with a cut out making it into a "C" shape, this slots into the groove and the two small spigots either side go into holes in the left end of the lever.

Another way is to have a forked end to the lever with two pins that face inwards and locate into the groove.

Or the other way is to h ave the lever off to one side of the vertical governor shaft and a single block that runs in the spools shaft, stuart governors are like this.

Edited By JasonB on 03/05/2018 16:34:48

I've got it now, going to make one of those.

Thanks Bob

Don't know where you will get one, but a place selling Mamod, or other "toy" steam engines, or the back up springs from oil seals, if you get a number of those the same size they can be joined together.

Ian S C

The One of the Stuart beam engine governor in the two photos uses a spring about 1/8" dia which is quite a bit bigger than the Mamod, you can buy them from Stuarts.

My bearing supplier sells the back up/garter springs as separate items. I think the range from 1 mm, to 5 mm, the length goes up to, let's say quite big.

Ian S C

Edited By Ian S C on 10/05/2018 11:19:58

If it ever comes to it I'm sure you could braid a circular loop or just create a multi-turn loop and whip over it. Archery suppliers likely still sell the dacron or kevlar threads I used to make my bowstrings from. And make a simple jig of 3 or 4 pins to give the correct diameter.

pgk

Thanks for the replies and ideas of other ways of doing a loop. I've brought some spring belts that will fit a Mamod small engine, so I hope that it all works when made.

Bob.

On a Stuart Turner S9 I used a drive belt from a cassette tape recorder (or was it a VHS recorder), it was square section, and fitted the pulleys well.

Ian S C