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Plans for a small 'square' (bore=stroke=12mm) engine with new-fangled metric dimensions. Possibly easier to get going than a rotary-valve engine, less fiddly than a slide-valve engine and a bit more interesting than a basic oscillating engine. Few parts, no difficult machining operations...

Plans for a small 'square' (bore=stroke=12mm) engine with new-fangled metric dimensions. Possibly easier to get going than a rotary-valve engine, less fiddly than a slide-valve engine and a bit more interesting than a basic oscillating engine. Few parts, no difficult machining operations...

Cheers, he also invented the compressed air delivery system used in banks etc! He worked for Boulton & Watt just don the road from here. Genius!

Thanks for the kind comments. Pete, I'd need to invest an awful lot im equipment to emulate Bog's method - I've got a mini lathe and a poor micro-mill with very little tooling. I plan to mark out the three corners for each space between the spokes then drill & file :big: as I have nothing to...

Thank you Chuck, Jim & John ;D It's crazy but I'm stuck trying to accurately mark out the flywheel - I've tried twice and just can't get it right >:( I bought two 4" discs of brass at a show last year and with current prices I'm loathe to start cutting until I'm happy with the layout. Seems I...

This project has been in my head for four of five years. I started building it about 3 months back and apart from the flywheel is almost complete. It's my take on William Murdoch's very early oscillating cylinder engine (said to be c1785!) and features a normal piston type valve activated by...

Superb.

Why not take all your tooling etc and hook up a laptop (surely the venues have wireless internet access?) so stuff you sell on your stand automatically comes off your stock? Granted it would slow down sales on your stand but you'd still be able to sell to 'real' and virtual customers. Paul

All done except for one grub screw and a polish! First one of these I've built and quite surprised how well it runs... http://youtu.be/WtLhiItSQFg

A bit more progress; roughed out flywheel and bracket but still need to made a decent connector.

Second run of (yet another!) rocking engine sporting hideously wobbly flywheel plundered from an old project and temporary hacksaw-quality-finish base. Ran the first time I connected it up - seems even easier than making wobblers http://youtu.be/xoII-14QViw

Stop-gap project while figuring out what to do with other problems: this is a simplified version of Elmer's wobble plate, mostly brass with some steel bits. It's simplified because I didn't have materials in suitable sizes and I didn't feel like filing down bigger lumps. Proportions are similar...

Hi Bob Yes I realised the knurled part unscrewed but it doesn't allow me to remove the 'contents' - they get stuck at the top....maybe more elbow grease neede? ;D Cheers Paul

Images: https://picasaweb.google.com/ouramazingpast/ModelEngineering#5614976502279079810 https://picasaweb.google.com/ouramazingpast/ModelEngineering#5614976502736665346

I bought this 'vintage' paraffin blowlamp/torch at a steam fair today (it cost me 3 UKP and suffice to say there was no brass visible at all until I gave it an initial de-crudding). I'm a bit stumped with the pump though - when I finally managed to unscrew it instead of the expected nut at the...

:bow: Excellent... if only I had the time, equipment and expertise! :big:

Thanks for that info. The uneven load had crossed my mind before I started on the other project (another simplex pump). :big: Hehe, got to start somewhere though! Paul

Thanks Herbie. Chuck, hehe you spotted the glaring omission :big: - should be along shortly along with steam instead of air. Ian, its a simple piston or spool valve, the brass bit on the piston rod whacks the 'stops' moving each valve either side of the hole between the valve chamber and the...

While the main project is still suffering from some alignment problems I thought I'd build a quick and dirty pump with valve set up inspired by the Stuart Turner pumps. Here's the completed engine side of things as it stands. For info, it has a 5mm bore with a 14mm stroke. It purrs along...

;D I wish 0.05mm was a lot to my eyes, I seem to have trouble seeing anything finer than an inch these days :big: