Thank you Marv. It is indeed an amazing little engine! - I'm very glad I decided to build it. And thank you; I'll make up a proper setup for winding springs in future.
Thanks Ron
- all the tooling tidbits I've built helps a lot in getting the job done a bit quicker; means I get to make mistakes quicker as well!
Pleasure Paul Thm: - If you make one like it, just be careful and grind enough clearance on the side facing the outside of the flywheel to compensate for the curve it has to follow, and be sure to hone the cutting edges pretty well with an oilstone, otherwise the bit chatters like mad when cutting.
Thanks Carl
- The flywheel is as per the original plans; I didn't want to change it's design, as that could make the difference between a runner and a non-runner on flame lickers. A couple of months ago I made a conscious decision not to let any little bits stop me; and that helps a lot; I think half of any job is already done by just keeping a positive attitude.
Today's bits; I started with the base, which I decided to make from wood for this engine. A bit of Rhodesian Teak trimmed to rough size with the jigsaw:
Sacrilege! - but the flycutter works a treat in trimming down and cleaning up some wood :
I will really have to invest in some proper woodworking tools at some point!
I used a router bit to pretty up the edges of the block; the mill's top speed is a bit slow for routing bits, but it does get the job done:
Just needs some oil and a good rub-down with floor wax now...
On to a 3/4" to 1/2" copper pipe reducer; trimmed up and tidied up in the lathe:
A bit of scrap HRS turned down to a fairly tight push fit in the 3/4" section of the reducer:
The above was needed so that I could clamp the reducer at an angle in the mill vise without squashing it. I only have 5.5mm diameter pipe for a spout, and no 5.5mm end mill, so I used a 4mm end mill to drill the hole for the spout, and then very carefully followed that with a 5.5mm drill bit. A generous serving of cutting fluid was used; copper is one of the less fun metals to machine:
One of the projects I have on the back-burner is an experimental boiler build - and I learned one good lesson from that; It takes quite a bit more heat to re-melt silver brazing that was already done than to do new brazing. With that in mind, I first silver brazed the spout in the reducer, then cleaned the bottom edge and bottom inside edge of the reducer very well with sandpaper, and made a ring from silver solder that fit in there:
Then I liberally coated around the silver solder ring with flux, being careful not to get any flux on the outside edge. The foot plate is some 1.6mm brass that I just cleaned well with sandpaper.
I just carefully plonked the reducer part down in position on the foot plate, with a lump of steel on top to keep it in position, then let it sit like that for a couple of minutes so that the flux would gravitate down onto the brass foot plate as well, then used a blow torch to heat the lot up, concentrating the heat directly on the joint. After a short while I could see some flux bubbling to the outside as it followed the flame, then it went black and then clear, and a second or so later I could see some silver brazing wicking through. I used the flame right around the entire joint to draw the silver brazing through and let things cool down:
I'll happily admit that this is the best bit of silver brazing I've done to date
The tank was then dropped in some citric acid to have a bit of a pickle, and I started on the cap for the tank - a simple turning and knurling job:
Wicking was a bit of a problem; I'd used cotton based wicking on Fred the Loco's burner, but when the meths run out the wicking is inclined to smolder and burn off. Amongst my junk prized collection, I have a sheet of fiberglass mat... Some judicious peeling away of fibers was done, and then all aligned and rolled into a kind of string; a bit fiddly, but I got it fed into the spout in the end:
(Now it had more hair than me!)
I played barber a bit, and filled the tank with meths; A purple glow quickly appeared at the top of the wick, and I tested it:
Earlier while I was waiting for the meths tank to pickle, I'd also thoroughly oiled and lightly waxed the base, So I assembled the lot, and ended up with this:
A puff of graphite powder into the cylinder, a drop of oil on each of the running bits where needed; and a lot of fiddling with wick position; it's a choosy little bugger - but it runs ;D:
[ame]http://www.youtube.com/watch?v=qX92TajOVp4[/ame]
The second part of the video was taken in my study; in the shop it was 35C and in my study with air conditioning 26C - It seems to like running in the cooler environment a lot better!
Overall a fun little project - and very very rewarding in the end!
Regards, Arnold