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| Stilldrillin:
That`s looking very good Stew! :thumbup: 1st grandchild? I know just how you feel, though I`ve had 5 weeks practice now! :ddb: Hope all goes well for you and yours...... :wave: David D |
| sbwhart:
Thanks Dave our daughters due date is today so we're on tenderhooks. Any way got some more of the base done today. Drilling some holes I like to do this job on the angle plate so that I can keep everything lined up its how I did No 1 and that seemed to work OK. Shaping the vertical support on the RT Not looking to bad. Just a few minor bits to do and bend the elbows then It will be fingers crossed to see if she will run, then a bit of a polish. I've deviated quite a bit from the John Tom drawings changed it with some of Bogs' ideas along with a few of my own. Thinking of drawing it up with the changes and posting the drawing on her would you guys be interested in that ?. Have fun Stew |
| madjackghengis:
--- Quote from: sbwhart on February 21, 2010, 12:28:36 PM ---Hi Jack Thats some interesting ideas you've floated there, I toyed with the idea of having an hinged elbow using rubber, the sort of stuff they use for suspension bumpers on cars. Cheers Stew --- End quote --- Hi Stew, the first such "elbow engine" I ever saw, was in Popular Mechanics as a machining project, back in the late sixties, and it had six cylinders or twelve depending on how you count them, each piston had a ball machined at the connecting end, with the corresponding two ball ends either halved with a pivot pin, or tongue and grooved hinged, with cylinder diameter of about half an inch, and probably seven or eight inches square and tall. It was shown running, although still pictures don't do justice to such, yet for going on forty years, every single one I've ever seen which tried to emulate this engine with unfixed pistons has been given up as a loss, and redone with the pistons made one piece for both ends. It has only been the constant stream of these engines showing up in my life, and recalling that one which has brought me to finally focussing on the issue, and recognizing the reason for the failures. Now I have an obligation to get through my radial engine sooner, so I can actually put in practice, that which I have declared as true, because until it is in metal, it is just theory, not fact. I am extremely gratified you have managed to be so successful so quickly, and apparently easily, in getting it going with so little re-work. Great engine ,great inspiration. :smart:, thanks, Jack |
| sbwhart:
Thanks Jack for your positive comments, I get a lot of inspiration from great forums like this I keep getting infected with :proj:. Final bit of assembly work today:- Bent the elbows using a gas torch and a couple of bending rods, then bent them close to square against a 1*2*3 block, and got them dead square by first clocking my vice jaw up true, then set the elbow up on a parallel and clocked it up and gave it a few final tweaks to bring it dead square I got them to within 0.001" run. Then carefully measured the engine and calculated to determine the length of each arm of the elbow. Then set them up in the mill and cut them back to give 0.5 mm clearance. I use a three part axle pin, so that I get dead square shoulders and it makes it easy to measure up the thickness of the cylinder and to trim the pin off to 0.05mm longer than the cylinder, you can see them in this pic Assembled the engine up and this is what it look like, I still need to bling it up a bit radius the base edge, I may make a wooden base. And yes it does run :D :D :D :D :D :D :D I'll post a vid after the final bling. Have fun Stew |
| Stilldrillin:
It ran 1st time?!! :bugeye: Yer getting a bit good at this lark now........ :thumbup: Well done Stew! :clap: David D |
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