Author Topic: Pennsylvania A3 Switcher (Kozo)  (Read 17682 times)

Online Dave Otto

  • Full Member
  • *****
  • Posts: 3558
  • Boise, Idaho USA
    • Photo Bucket
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #45 on: November 11, 2018, 04:03:09 PM »
The wheels look very nice Kim!

Dave

Offline Kim

  • Global Moderator
  • Full Member
  • *****
  • Posts: 3537
  • Portland, Oregon, USA
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #46 on: November 11, 2018, 06:11:01 PM »
Thanks Zee, and Chris!

I've been looking forward to it for a longtime too! :)
Kim

Offline kvom

  • Full Member
  • ****
  • Posts: 1927
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #47 on: November 12, 2018, 12:02:47 AM »
Now we need to see the other side of the wheels.   :mischief:

Offline crueby

  • Full Member
  • *****
  • Posts: 8540
  • Rochester NY
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #48 on: November 12, 2018, 12:34:19 AM »
Now we need to see the other side of the wheels.   :mischief:
And the bin of spares...


 :cheers:

Offline Kim

  • Global Moderator
  • Full Member
  • *****
  • Posts: 3537
  • Portland, Oregon, USA
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #49 on: November 12, 2018, 05:06:56 AM »
Now we need to see the other side of the wheels.   :mischief:
Kvom, that picture shows both sides - half of them are right-side-up, and the other half are upside-down.  :Jester:

And the bin of spares...
 :cheers:
Yeah, didn't show the recycle bin (yet). There's only ONE puck in the reuse bin - so far. I mis-read my dial caliper (thought it said 0.775" and it really said 0.675, and I cut the hub way too small). I figured I'd get through the next series of steps on the wheels then show my rejects.  Not that I think there will be any more.  No, of course not.  But I don't want to Jinx it!  ;)

Kim

Offline Ye-Ole Steam Dude

  • Full Member
  • ****
  • Posts: 1327
  • Deep East Texas on Sam Rayburn Lake
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #50 on: November 12, 2018, 09:50:04 AM »
Hello Kim,

Looking real good and you are making good progress so far. I enjoy seeing parts beginning to stack up, large piles of completed parts is a good thing.

Have a great day,
Thomas

Offline Kim

  • Global Moderator
  • Full Member
  • *****
  • Posts: 3537
  • Portland, Oregon, USA
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #51 on: November 18, 2018, 03:13:13 PM »
Thanks Thomas! :)

This week I made some more progress on the tender wheels.

First, I made a 5/16Ē mandrel to hold the wheels.  A fairly simple turning operation.  Here I just finished single-pointing the 5/16Ē-24 threads:


With that complete, I mounted one of the wheels in the mandrel and turned it to the final outside dimension of 2 1/4". 


Then I cut the general shape of the tread, but no tapering (yet).


Then, I did it seven more times!


The next step will be to taper the tread and the flange, which should finish up the tender wheels.

Thanks for stopping by!
Kim


Offline cnr6400

  • Full Member
  • ****
  • Posts: 277
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #52 on: November 18, 2018, 04:25:59 PM »
They look great Kim, nicely done.

Offline zeeprogrammer

  • Full Member
  • *****
  • Posts: 6372
  • West Chester, PA, USA
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #53 on: November 18, 2018, 04:31:46 PM »
Yes, they look great.

Why didn't you do the tapering after turning the general shape?
Any concerns about keeping it concentric?
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline kvom

  • Full Member
  • ****
  • Posts: 1927
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #54 on: November 18, 2018, 05:29:26 PM »
You might consider buying/making a form tool for the flanges, and you'll have 4 more to do for the loco.  Note that the flat part of the tread needs to be at a slight angle. 

http://ibls.org/files/Standards/IBLS%20Wheel%20Standard%203534DG%20Gauge.pdf

If you do decide to machine them manually, I suggest doing the same cut on all wheels at one time for consistency.
« Last Edit: November 18, 2018, 05:32:59 PM by kvom »

Offline Kim

  • Global Moderator
  • Full Member
  • *****
  • Posts: 3537
  • Portland, Oregon, USA
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #55 on: November 18, 2018, 06:24:54 PM »
Thanks Cnr, Zee, and Kvom,
Zee, the reason I didn't do tapersthis time through is that I'm going to have to reposition the compound slide a few times for the tapers.  And as Kvom hesaid, I want all the tapers to be consistent. So I'll set the taper once then do all eight wheels. If I did it now, I'd have to reposition the tool lots of times, and likely not get the same taper!

Kim

Offline gerritv

  • Full Member
  • ****
  • Posts: 537
  • St Catharines, ON
    • Gerrit's Hobbies
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #56 on: November 18, 2018, 06:59:24 PM »
Lovely work. Always fun plotting repetitive parts sequence of ops.

Gerrit
Don't confuse activity with progress

Offline Kim

  • Global Moderator
  • Full Member
  • *****
  • Posts: 3537
  • Portland, Oregon, USA
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #57 on: November 23, 2018, 10:39:37 PM »
Thanks Gerrit!

The next step on the Tender Wheels was to angle the tread and the flange.

Kozo recommend that you blue (or somehow color) in the tread and flange so that its easier to see when you cut close to the corner.  So, thatís what I did. After which, I set the compound at a 10o angle and cut the tread on the first wheel.


Did this seven more times.
Then I readjusted the compound to be 10o for the front side of the flange, and cut all eight of those:


Next, was another compound adjustment to cut the 10o angle on the back side of the flange.


And finally, I used a file to round over the top of the flange a bit, and to take the edge off the front of the tread.


Hereís a shot of all eight completed tender wheels:


Before I'm all done with the tender wheels I need to clean them up a little more and paint them red!  Iím going to do some of the painting as I go this time.  Canít leave all the fun for the end, right?   :Jester:  (I donít really like painting, just in case you didnít know that.)

Thanks,
Kim

Online Dave Otto

  • Full Member
  • *****
  • Posts: 3558
  • Boise, Idaho USA
    • Photo Bucket
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #58 on: November 23, 2018, 10:45:47 PM »
The wheels look very nice Kim, but I'm curious about the 10 degree taper, was that a typo; I see 3 degrees on the print underneath the wheels?


Dave

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13344
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: Pennsylvania A3 Switcher (Kozo)
« Reply #59 on: November 23, 2018, 10:55:11 PM »
Same question. I don't have the A3 book but both the Shay and climax also show a 3 degree tread angle as does kvom's reference.

Bill