This winter's project. A transmission for the 302 engine

[gbritnell]

Thanks everyone for commenting. Here's today's update. I just slowly remove more and more metal until it looks like the drawing. I had to go in with my burrs in one area because I just couldn't figure out how to hold and twist and tilt the thing to make a cut. Once I took the stock off I could then see how the curves and angles developed and did more machining. I had to take the jaw back off of the vise so I could rotated the housing to get the speedometer hole in. I layed out the centerline, center drilled and drilled the hole and then went in with an end mill and cut a witness for the surface.
George

 

[gbritnell]

You know when you're building something and you get a pile of parts and you just have to assemble that pile of parts to see what the thing is going to look like? You don't? Well I do. I have the main case sitting in my display case upstairs so I had to run up, get it and screw the 2 pieces together just to see what it looked like. Now it getting fun!!! This will probably be the last post for a little while. I'm now working on the 1/6 scale Galloway and finally got the drawings and dimensions sorted out so I'll be back on that for some time. Anyway here's what it looks like bolted together.
George

 

[Lakc]

Absolutely fablulous looking George! Please dont make us wait too long. I want to see some splines and synchro's. woohoo1

 

[Metal Butcher]

Wow George it looks super! :bow:

Can't wait to see it in person! Hint, hint.

-Rick

 

[kcmillin]

Really Awesome George, thats some amazing stuff.

Even if you stopped now, that is quite the accomplishment, but please don't stop :big:

Kel

 

[steamer]

Really Awesome George, thats some amazing stuff.

Even if you stopped now, that is quite the accomplishment, but please don't stop :big:

Kel

DITTO!!!!

:bow: :bow: :bow:

 

[ozzie46]

Gorgeous George, absolutely gorgeous. :bow: :bow: :bow:

Ron

 

[doc1955]

Wow is right!! th_confused0052
Totally amazing I love it!!

 

[gbritnell]

Here's the latest progress on the trans. I make a couple of cuts then reset the case to another angle and make a few more cuts all the while trying not to take too much off.
George

 

[zeeprogrammer]

Still following.

That is amazing craftmanship.

 

[RManley]

This project is truly amazing :bow:

Its projects like this that make me sad im so far away from my workshop

Any chance you could provide a link to the engine, and what scale is it?

Rob.

 

[gbritnell]

Hi Rob,
The engine is a 1/3 scale Ford 302 V-8. I'm sure there is a thread on it somewhere but for anyone new here is the link to the video on Youtube.
[ame]http://www.youtube.com/watch?v=O_vQp0gevh0[/ame]
Last year's project was a design and build of a V-twin engine so this year I wanted to do something a little different hence the transmission for this engine.
George

 

[gbritnell]

I made some more chips yesterday. I felt that with most of the heavy cutting done I could machine off the 2 big lugs remaining at the top front of the case. With that done I once again took the jaw plate off of the vise so that I could clamp the case end wise to cut around the speedometer boss. I did a little nibbling there for now as I'll have to go back in and step the radius when I get more of the metal above it removed. At this point it's a slow process, more setup than cutting.
George

 

[gbritnell]

Once the 2 big lugs were machined off I could go in and step off the radius around the shift shaft. It's tapered on the full sized case and I might make a special setup with my rotary table once all the other cutting is done to put the tapered shape on it.
George

 

[gbritnell]

The next step was to lay out the remaining ribs. I blued the case up with a marker and scribed the lines. It was then put back in the vise and I started the heavy cutting, if you can call a .187 ball mill heavy cutting. The finished contours will be done with .125 and .094 dia. ball mills. Once the material around the ribs is cut out the case will be rotated so that I can cut the angles onto the ribs.
George

 

[stevehuckss396]

Looking good G!!

If you wouldn't mind, could you take a picture (next time it is assembled) with the trans sitting in your hand. It would be nice to get a sense of how small it is.

Thanks!!

 

[gbritnell]

Here's the end of today's work. I just finished up at 8:30 pm and took these pictures. The first set are a continuation of the rib profiling. After going in with the .187 ball I started to finish with the .125 ball. I had my step off chart set up for the radius and had my rib dimensions for the stopping points.
George

 

[gbritnell]

The next set of pictures are from my photo stand. The first with a half dollar coin next to it and the third with it bolted to the main case. The last is per Steve's request so a person can get an idea of the size.
George

 

[doc1955]

Wow does that looks nice! :bow: :bow:

(by the way I wouldn't part with my travadial! Thanks!)

 

[agmachado]

Hello George,

I do not have words... absolutely fantastic!!!

Congratulations!!!

Cheers,

Alexandre