Belt Drive reduction unit

[IvyMcNeil]

Hi All

My latest project for friend, He flies 1/4 scale model aircraft and needed a reduction unit to drive a 30" prop., The engine is 62 cc .
Here's the results.

Ivy McNeil

[Harold_V]

Beautiful work, Ivy! Did you machine the timing belt pulleys?

How about a hint of what it powers?

Harold

[IvyMcNeil]

Hi Harold
It is going to power a WW1 Fokker tri wing, it has a wing span of 105".

Yes I machined the pulleys, I ground a form tool on a hss lathe bit and mounted it in a fly cutter.

I made an indexing fixture useing a shot pin for locating, and various other fixture's for the lathe so I cuuld make more as needed.

Ivy

[Harold_V]

Excellent! I recently made a pair of pulleys similar to those, using the same technique. My only problem was trusting a vernier pin type indexing fixture (import) that didn't index uniformly, so the teeth on mine had to be made somewhat narrower to compensate for the irregular pitch. Worked great in the end, however, and with the load in one direction only, the added clearance isn't a problem.

If possible, could you post a picture of the Fokker? Sounds real interesting.

Harold

[IvyMcNeil]

Hi Harold

The plane is still under construction, I will get a photo of the construction next time Im over there.

Here's some photos of my fixture and pulley.

Ivy

[Harold_V]

Very nice fixture. It displays features I'd expect from one with considerable experience.

You appear to be quite comfortable with grinding HSS tools. I've said right along that unless you can do so, you're held captive by your lack of ability. My impression is that you've done a job in keeping with the best of the pro's. You can be justly proud!

Sure would be nice if others would share their projects----it's quite inspirational to see what can be done.

Thanks, Ivy.

Harold

[IvyMcNeil]

Hi Harold

I am a ret. Machinist/Toolmaker/Moldmaker/Tool and cutter grinder and floor sweeper.
I started in the shops in 1959 and retired in 2002, I thought it would never end "LOL".
23 years were spent in the Aerospace Indus.
I started building I.C. engines in 1975 and built several engines over the years, latest project is the Forrest Edwards 5.

Just a little Personal history
Ivy McNeil

[Harold_V]

Chuckle!

I should have known! The quality appeared to be superb. Now I'm sure it is!

Like you, I thought my time would never end. I insured it would by closing the doors on my shop after being in the trade for 26 years. To be quite honest, I still don't much like running the machines, but I'd be lost without them.

Sure would be nice to see some pics of those models, Ivy. If it's not too inconvenient, please post a few. I'm sure I speak for the masses when I say we'd really enjoy seeing them.

By the way, I'm green with envy. I became a machinist so I could build models. The old adage that the shoe makers kids go barefoot sure holds true with me. I was so busy making a living that it never happened. I have great plans for the future, though!

Harold

[IvyMcNeil]

Here's some pics.

The twin is a 40cc, it was the first engine I designed and built the other one is also 40cc .

I had a fire several years ago from an unattened trash fire and burned down my storage barn and lost all os my engines, model boats,car,radio control.

These engines were in the house and were saved, now that Im retired and have the time I've started building again.
The Edwards 5 has been very time consuming I hope to get back on it soon.

Ivy

[Harold_V]

Way cool!

Do you use piston rings, or do you rely on a tight fit?

Sorry about your loss to fire. What a shame to have lost things that represented your life and pleasures. I imagine it was a lot like losing members of the family.

Thanks, Ivy.

Harold

[deere_x475guy]

Ivy amazing work! Can't wait to see your Edwards completed.