Pennsylvania A3 Switcher (Kozo)

[crueby]

Great results, those rods look terrific!
 

[Kim]

Thanks Dave and Chris!

Nice to have the rods done.  They were more work than one would think.  But the next few parts will be simple things like bushings and a few decorative items (for the rods, of course )

Thanks,
Kim

[cnr6400]

 

[RReid]

Nice job on the rods, Kim. Good, clear process pics and descriptions too. Yep, I think you've earned a few bushings (and a beer  )

[Kim]

Thanks CNR & Ron,
Appreciate the comments!
Kim

[Don1966]

 I am late Kim but nice wok buddy…..



 
Don

[Kim]

Thanks Don! 

Kim

[Kim]

Chapter 13.3 – Bushings and Spacers

As I said, the next set of parts is fairly simple, just a bunch of bushings and spacers.

They were all made form Phosphor Bronze (I believe it is 932 (SAE 660)).  This stuff machines really nicely!

I used some 3/8” and some 5/8” nominal to make this set of items.  All simple turning jobs:


Then I spent some significant time getting it to all work right with the side rods.  Kozo’s tolerances are very tight. And I had to loosen things up some to get the wheels to turn freely when the axel pivoted (as its supposed to).  I worked at it till I got it to turn freely for the entire range of motion.  Hopefully that isn’t too slopy, but if it bound up with just the rods, I don’t see how I’d have a chance at getting it to run with the rest of the mechanism in place!


Anyway, it seems to turn quite freely with both side rods on, no binding anywhere, and it doesn’t really seem too sloppy.  So I think I’m happy

Kim

[propforward]

It's a very impressive assembly - really looking great!

[crueby]

If it is 932 (SAE 660) bronze, that is called Bearing Bronze, it is not Phosphor bronze. It machines much easier that phosphor bronze does, less grabby and cooler. I like it a lot better than the phosphor bronze.

[joe d]

  A significant step, Kim.

Still following & enjoying the ride!
Cheers, Joe

[Admiral_dk]

Lovely milestone you have reached here - and nice appearance too 

Still following and enjoying the journey - thank you Kim     

Per

[Kim]

Thanks Stuart, Chris, Joe and Per! 
Kim

[Kim]

If it is 932 (SAE 660) bronze, that is called Bearing Bronze, it is not Phosphor bronze. It machines much easier than phosphor bronze does, less grabby and cooler. I like it a lot better than the phosphor bronze.

Chris,
You are, of course, correct; the 932 is bearing bronze.  Kozo calls for phosphor bronze, but I substituted the Bearing Bronze because it's more readily available, less expensive, and much more machinable, as you said.

Sorry for my mistake in the original post. Hope I don't confuse too many people with that!
Kim

[Kim]

Chapter 13.4 – Cotters and Bolts

Made a little more progress today.  I completed the fake cotter pin & nut for the big end of the main rod.  Here are the four little pieces (and I do mean little – they’re each ~ 1/4" long with 2-56 threads.) that make up the rod decoration.


And here’s what it looks like installed on the rods:


And finally, on the assembly.


Next up I’ll be starting on the cylinders!  That will be a big job…
Kim