Search results

lol, i wouldnt stand near that! take your eye out if they came loose :hDe:

very interesting, one question, does the engine hit and miss without the bob weight? i wonder if you could put some sort of hook lifting a weight that then drops it over tdc, free wheels down then picks up another weight? would work with water too i suppose

top notch work there on the follower

another way to extract the most power i found is by adjusting the piston to displacer timing, prehaps a consideration when building another engine to make this a controllable peramiter, good work with your completed model though.

Looking very good! like the polished finish, im guessing its doing around 50-100 thousand rpm, which may mean your drive pulley is a little big! a very low friction 100/1 or more worm reduction, and i think this turbine could do some "work". great stuff, look forward to more posts!

alternativly you could turn a step on the hot tube and seat it in a piece of turned ceramic in the head, and use a screw to exert force onto is end to seal it.

Thats pretty cool, you could exhaust the gas through the centre like a turbo turbine, all you would need to do is drill some holes through from every "fin"

This will be very dependant on the machine used as well. Plus type of cutter, carbide endmill, HSS, indexable inserted etc.

Good info! Sprokets can also be made similar to the above by drilling a series of holes on a PCD in a blank, and then finishing with a file.

Interesting read, We used to make something similar (on a longer scale) for guiding a wire rope onto a drum, very tricky to get working smoothly, without sticking. Any pictures of the stylus itself? a lot of work in that too IIRC.

Interesting experemantation chuck, i wonder if a raise in compression and a switch to a more "detonation prone" fuel would help? I think you should definatly continue with this work.

as long as it is single start worm that is ;)

called a "ripper" very good for roughing as you say, i have used them many times ;)

It worked on the olds gearless engine, so i think i can make it work. The critical areas are clearance, and stroke. As the indexer has to index whilst away from the pushrod, eccentric timing is important too.

Been brainstorming a bit, think ive decided on a gearless hit and miss design, similar to an olds design with my own twist. Here is a sketch i did to show the rough principal.

thank you, i need to get cracking with some more work on it!

thanks, im sure it will spin for longer at a higher speed ;) BBs are a good idea thou if i get problems

Acetal is an exceptionally good material to work with, its fantastically easy to machine. The only thing i would suggest, and this may not apply to you personally as you are using only air, it does expand quite a lot with little heat, causing it to bind in the cylinder. I used it once on a...

The worst feeling in the world has to be the spilt second before the machine hits the material in rapid and you know you can do nothing about it, because you have put a decimal point in the wrong place when adjusting an offset! CNC programming at its best

that will be great, cant wait.