Author Topic: Pennsylvania A3 Switcher (Kozo)  (Read 29128 times)

Offline Kim

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #60 on: November 23, 2018, 11:07:19 PM »
 :facepalm:    :facepalm:     :facepalm:     :facepalm:    :facepalm:     :facepalm:
Nope, not a type-o. Wish it was.  I cut them at 10o, though it clearly says 3o.
 :hammerbash:

That kinda blows my last few weeks of work.  And an expensive chunk of 12L14....
  :wallbang:

Well, now the question - do I do-em again?  Or decide that my slightly over-tapered tread on these wheels won't matter a smidge, since this will never be used on a track in any serious way. It's more of a mantle piece for me.

Hmm... how noticeable do you think that will be in a finished model?  Will people be shocked and appalled at the cones I'm using for wheels?  Or will it not even be noticed.  :slap:

 :Doh:

Guess I'll think about that for a bit and do something else for a while...

Kim  :facepalm2:

Online crueby

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #61 on: November 23, 2018, 11:16:25 PM »
Ouch! I hate when very carefully, precisely, doing the wrong thing.   :zap:




One other option, recutting the bevel to 3 degrees, and trimming the flange. How much would it reduce the OD of the wheels? Too much?

Offline kvom

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #62 on: November 23, 2018, 11:16:53 PM »
The taper is just to keep the wheels on the track going around a curve, and when on a straight track it won't be noticeable.  I wouldn't scrap them.  You can recut them at 3 degrees and then adjust the flange.  Wheels will be a bit smaller but again not a big deal.

Offline b.lindsey

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #63 on: November 23, 2018, 11:22:10 PM »
Or you could cut the treads square again, heat shrink a tire on each and cut the proper angle. It probably won't matter for display purposes but I would sure be wanting to run it after investing all that building time.

Bill

Offline 10KPete

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #64 on: November 23, 2018, 11:27:10 PM »
I agree that the angle won't really matter. Nor does the exact size. And the fix is not hard if you do as Bill suggests. I don't know how many times something like this has set me on my heels until I've had time to fully appreciate the impact....

Ouch!

Pete
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Online Dave Otto

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #65 on: November 23, 2018, 11:29:41 PM »
Sorry Kim that's a bummer. :(
If it were me I would either repair them or remake them, I really doubt that I would leave them as is. As Chris indicated maybe you could just re-cut the wheel and reduce the diameter accordianlly. How much would this be on the radius? Maybe not enough to matter.

Dave

Offline zeeprogrammer

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #66 on: November 23, 2018, 11:47:14 PM »
That's a bummer and I'm betting you're still kicking yourself over it.
Set it aside. They can wait. Do some other things (i.e. parts) for a while.
The answer may/will come later.

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Offline Kim

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #67 on: November 24, 2018, 12:17:46 AM »
Thank you all for the commiserations and the suggestions.  I do appreciate it.

Yeah.  I'm feelin' kinda irritated with the whole thing at the moment.  I'll probably just go away and try not to think about it for a while.  If history is any guide, I'll probably feel less down about it tomorrow.  But right now, its pretty much taken the wind out of my sails...

 :'(
Kim

Offline zeeprogrammer

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #68 on: November 24, 2018, 12:23:49 AM »
Yeah.  I'm feelin' kinda irritated with the whole thing at the moment.

Nah. Just the wheels. Don't forget about all the good feelings you had with other parts.

I'll probably just go away and try not to think about it for a while.

Hard to do, but yeah.  ;D

I've stopped projects for less. Don't do that.

I should listen to myself sometimes.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline kvom

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #69 on: November 24, 2018, 12:38:15 AM »
Assuming you cut the taper so that the flange diameter is intact, then the diameter of the face of the wheel is already a bit smaller.  But cutting the proper taper won't change that; only the flange diameter will end up being reduced.  Based on this and the drawings, I calculated that the wheels are smaller by .049" than per plan.

Online crueby

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #70 on: November 24, 2018, 12:41:50 AM »
Assuming you cut the taper so that the flange diameter is intact, then the diameter of the face of the wheel is already a bit smaller.  But cutting the proper taper won't change that; only the flange diameter will end up being reduced.  Based on this and the drawings, I calculated that the wheels are smaller by .049" than per plan.
So it scales out to  wheels with a bit of wear that the maintenance shop refaced. Realistic!

Offline b.lindsey

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #71 on: November 24, 2018, 12:52:53 AM »
If that is correct then the tender would only sit .0245" lower. Negligible for display or running. Sounds like a plan to me.

Bill

Online Dave Otto

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #72 on: November 24, 2018, 12:55:42 AM »
I did the same thing and came up with .043" on the radius, but I was only working from the dimensions that I could see in Kim's photos.

Dave

Offline kvom

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #73 on: November 24, 2018, 02:30:06 AM »
I meant to say the radius. 

Measurements done using Draftsght.

Offline Kim

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Re: Pennsylvania A3 Switcher (Kozo)
« Reply #74 on: November 24, 2018, 03:10:51 AM »
Yes, some time away doing other things was a good idea.  Helps put the world into perspective ;D

Yes, Dave and Kvom, guys have it right.  It would be about 0.043" short on the radius, or 0.086" smaller in diameter (not quite 3/32").  Since the inner diameter is SUPPOSED to be 2 1/16", that would be about 4% smaller.

Now much will that bother me?

I might play with one wheel tomorrow and see how it looks. But right now, I'm kinda thinking that the next several weeks of my shop time will be making 8 more wheels!  But it will go better this time!  And think of the cool paper weights I'll have to sit around my desk?   :-\

How would I learn to pay better attention to the plans if I didn't make stupid mistakes, right?
And it keeps me humble.
Kim