Gears

[sawyer massey]

Well pinion gear later 90% complete it is close in on both side
So 3 boxes .
Does come out of the sand and the hardboard ends turn nice when on the right centers ......we will see what happens when I pour them

 

[ddmckee54]

What's this gear for? I doubt that you're doing this just for funsies.

 

[GreenTwin]

I tried to cast a couple of windmill gears a few years ago, and got close to succeeding.

I gave up on it because I did not have enough time, and it was a freebie anyway.

I could almost get a clean pull from the bound sand, with no draft angle, but not quite.
If I would have had more time, I would have 3D printed a gear pattern with minimal infil, and heated it a bit to get it flexible to the point were it would collapse and release from the mold.

I think I can make usable cast gears using bound sand, and all they would need is a little cleanup, and perhaps a run-in with lapping compound; ie: no machining required.
Bound sand makes a very accurate castings.

 

[ddmckee54]

So this is more or less just for funsies?

 

[sawyer massey]

So this is more or less just for funsies?

This is the pinion gear for a novel Waterloo steam traction engine
That's it as a portable
And the main drive fear roughed out

 

[GreenTwin]

Before I got into backyard foundry stuff, I always assumed that on the old days, gears were cast blank, and then the teeth were machined after the casting process was complete.

Then I visited the Soule foundry in Meridian Mississippi, and there were many gear patterns on display and also in storage.
The patterns were very accurate, and all of them had teeth, and so I learned that they did cast the teeth on all sorts of gears back in the day.

.

 

[GreenTwin]

A few more Soule photos.

It should be noted that while they did not have modern resin-bound sand for cores and such back in the day, they did use linseed oil bound sand with great success, and achieved results that matched what modern resin-bound sand can achieve.

Soule still has the ovens where they baked their cores, as well as apparently all of the patterns that they ever created.

.

 

[ajoeiam]

This is the pinion gear for a novel Waterloo steam traction engine
That's it as a portable
And the main drive fear roughed out

Hmmmmmmmmmmmm - - - you sure that's the pinion gear for that size tractor - - - - might it be the bull gear?

(I learnt, maybe wrongly, that the little gear is the pinion and the big gear is the bull gear but I'm not positive - - - - correction - - on my thinking is desired!!!!!!!)

 

[ddmckee54]

Nope you're right, pinion gear - little, bull gear - big. However, I think that IS the little gear.

 

[ajoeiam]

Nope you're right, pinion gear - little, bull gear - big. However, I think that IS the little gear.

Hmmmmm - - - - necessarily guessing (I can't measure from here!!! - - grin).
The gear pictured looks to be some 16" (400 mm) in dia.
The pic of the engine its going onto - - - - the engine looks like the big gear would be that size and the pinion at about 4 - 5" (100 to 125 mm).
But - - - those are guesses on my part because I can't measure - - - - wail and moan!! (LOL)

 

[sawyer massey]

The bull gear is 14 inches
The pinion is 3.5

 

[William May]

A friend of mine found a 1904 automobile called a "Buckmobile" in Ithica, New York, and brought it home to restore. It was an untouched original automobile.
While doing the restoration, he discovered that the radiator was made by the "Rome-Turney Radiator Co." In checking on their history, he found that EVERY DRAWING, PATTERN, AND SPECIAL TOOL THEY EVER USED FOR MAKING ANY RADIATOR HAD BEEN CAREFULLY PRESERVED. I think it was all donated to a local historical society, with the proviso that they make the information and tooling available to anyone who needed it to reproduce one of their radiators.
This individual was VERY particular about his restorations. I made patterns and cast a number of parts to complete the car. I also made the nickel wheel rim retainers, and 2 new camshafts for the engine. It was really cool working on something so ancient and original. When he was finished, the car was about 90% original parts, as he saved not only all the mechanical parts, but the aluminum fenders, and the wooden body. He took me for a ride in it when it was done. The car is now at the Fountainhead Automobile Museum in Alaska, and you can see videos of it driving around. He felt they only built about 100 cars over a 2 year period, including an order from Czarist Russia for 40 cars, and he found a picture of those cars loaded in 2 rail freight cars, with a cloth banner saying they were headed for Russia.

 

[MRA]

Here's a thread showing me failing to get gear patterns out of the sand, and what I did to remedy the situation. The part-cast blank had enough signs of teeth in it, to be useful in making sure I was going along OK with the cutter and dividing head, and I suppose there was a little less material to remove with the cutter which didn't hurt.

https://www.homemodelenginemachinis...dscrew-80-63-approximation.32655/#post-354402

 

[sawyer massey]

The teeth on theses gears are 4 p ......53 deep I have packed the pinion and it comes out of green sand fine

 

[Richard Carlstedt]

Casting gears goes back over 200 years or more
Here is a photo of the pinion gear on the Hypocycloidal Pumping Engine in
the Henry Ford Museum in Dearborn ,Michigan.
The engine was built by Matthew Murray of Leeds (UK) about 1806.
The gears are magnificent and have a 17 degree Pressure Angle .
Murray was the epitome of foundry's back then and his sand composition was secret.
What You are looking at besides the gear, is the First Tapered Bearing as well. Murray invented the tapered bearing and you can see the bronze segments next to the crank pin. The bolts adjust the bearing fit.. Invented in 1804
Rich

 

[sawyer massey]

Well long way to go yet but seem to work tell better after casting

 

[GreenTwin]

Nice pattern work.
Looks great.
.

 

[sawyer massey]

Well hope to try it in the boxes tomorrow ..... finally

 

[GreenTwin]

Good luck.
Don't get in a hurry.

.

 

[sawyer massey]

Fix 2 teeth ....good to go