Mills MK1 Series 1 Scaled down to 0.56cc

[SmithDoor]

Hi Dave! I have the files from motor boys book I and II, can you give me your email?

kind regards
Rodrigo

Thank you
[email protected]

Dave

 

[Rodrigo Castellanos]

Hi! I did some work today!

having no tools for measure the tapper, only “feel” was used... having both piston and cylinder finished, I had That feel... hope it works...

 

[Rodrigo Castellanos]

Thank you
[email protected]

Dave

Done! please let me know if they arrive. Cheers

 

[SmithDoor]

Hi! I did some work today! View attachment 122307
having no tools for measure the tapper, only “feel” was used... having both piston and cylinder finished, I had That feel... hope it works...View attachment 122307View attachment 122308View attachment 122309View attachment 122310View attachment 122307

Thank you

Dave

 

[SmithDoor]

Done! please let me know if they arrive. Cheers

I have the drawings download

Thank you the answer little question on how the did work.

Dave

 

[Rodrigo Castellanos]

I have the drawings download

Thank you the answer little question on how the did work.

Dave

Hi Dave! Sorry??? How did work? What you mean? I don’t understand...

 

[SmithDoor]

Hi Dave! Sorry??? How did work? What you mean? I don’t understand...

The drawings show how others made the engine parts.
It helps when I am on the drawing board (Autocad)

Thank you drawings
Dave

 

[SmithDoor]

Hi Dave! Sorry??? How did work? What you mean? I don’t understand...

Here is one found works great for larger engines.
http://www.rc-airplane-advisor.com/model-airplane-engine-cycle.html
But when down to the 0.020³inch [0.33³cc] size engines are to small or the weight would get great to fly.

At this point I looking at a simple reed valve and the carburetor would have thodel control.

Dave

 

[Rodrigo Castellanos]

Here is one found works great for larger engines.
http://www.rc-airplane-advisor.com/model-airplane-engine-cycle.html
But when down to the 0.020³inch [0.33³cc] size engines are to small or the weight would get great to fly.

At this point I looking at a simple red valve and the carburetor would have thodel control.

Dave

hey! yes, i saw your drawings on other post, will be nice to see how it goes in the process.

 

[SmithDoor]

hey! yes, i saw your drawings on other post, will be nice to see how it goes in the process.

Some problems I have run into is working with AutoCAD the part look great till find it size of wire. That size part would be hard to make and use.
Smallest that works for thread size is #2-56 or #2-64 screw size or 0.086" diameter.

Dave

PS I have tap 0-80 0.060" diameter it is not fun the thing think of what if it break it just all around.
If I was doing hundreds I would use lead screw taping.

 

[Richard Hed]

If anyone is interested in building small engines, it really depends upon what you call small. I only build diesels and spark ignition engines, and my ignition engines are never small. My first really small diesel built back in 1988 was an own design 0.15cc diesel. Picture attached. Then at one time having built a 1cc Weaver I just halved all dimensions and made a 0.125cc version that I called the "Weevil" 'cos it really was an evil little thing before I sorted it out. Picture of both attached. Then just last year I made a copy of the well known Clanford "Clan" of 0.24cc. A video of the first run of the Clan is here Picture of the engine and parts also attached. So do I qualify as a builder of small engines?
Ken

Well I'm not sure--can you get any smaller? LOL

 

[SmithDoor]

Well I'm not sure--can you get any smaller? LOL

Will now you said it , now someone will make one smaller.

Dave

 

[Rodrigo Castellanos]

Some more work done today, piston/cylinder fits seems to be great. Everything feels like a good engine, no tight spots, nice breathing sound.. just missing the compression screw and milling the step in the piston top.

If engine runs, will make a new fuel carb and scaled fuel tank...

 

[SmithDoor]

Looks great
I hope post a video ofengine running.

I have thinking of using magnesium to weight down but used magnesium on B29 engines and had little problem with fire.
The material is using titanium instead of steel. Keeping the weight down.

The engine I build will use on a RC model airplane. I planned mak this type engine back 1970 but life took over.

Dave

Some more work done today, piston/cylinder fits seems to be great. Everything feels like a good engine, no tight spots, nice breathing sound.. just missing the compression screw and milling the step in the piston top. View attachment 122410
If engine runs, will make a new fuel carb and scaled fuel tank...

 

[KenC]

Drawings from Motor Boys will be helpful.

Thank you
Dave

So just go to rclibrary.co.uk and download for free the 2 books!
Ken

 

[KenC]

Some more work done today, piston/cylinder fits seems to be great. Everything feels like a good engine, no tight spots, nice breathing sound.. just missing the compression screw and milling the step in the piston top. View attachment 122410
If engine runs, will make a new fuel carb and scaled fuel tank...

I don't think milling the piston step after having achieved a good piston fit is a good idea at all. Easy to damage the piston when holding it. How to successfully de-burr the machined edges? How to ensure the piston doesn't distort ? etc.. But it all looks very nice so far.

 

[KenC]

Will now you said it , now someone will make one smaller.

Dave

Valentine has made engines very much smaller than my smallest so just Google him.
Ken

 

[SmithDoor]

Valentine has made engines very much smaller than my smallest so just Google him.
Ken

I hope to see the engine run.

Dave

 

[SmithDoor]

Valentine has made engines very much smaller than my smallest so just Google him.
Ken

Is this the right one.
https://www.worthpoint.com/worthopedia/ronald-valentine-engines-30th-49147766

 

[Rodrigo Castellanos]

I don't think milling the piston step after having achieved a good piston fit is a good idea at all. Easy to damage the piston when holding it. How to successfully de-burr the machined edges? How to ensure the piston doesn't distort ? etc.. But it all looks very nice so far.

you are right! i used my lapping ring as a holder.... but needed to de-burr the cut very carefully with a small file and make a last pass in the lapping ring. with good luck, my piston did not get damaged or distorted.... next time will make the cut before lapping...