Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

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8thscale
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Location: San Diego County

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by 8thscale » Tue Oct 09, 2018 10:21 pm

Donhost4449 wrote:
Thu Oct 04, 2018 12:22 am
As things go, there was a slight bind in the motion. John is studying the rotation to discover the source of the bind.
...
As it turned out, the rear axle quartering was off .009"
Would you please share more information? What was the setup to measure the error?
I've heard of making an offset key. Even if there are no photos any explaination would be appreciated.

Thanks

Kimball McGinley
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Location: Laguna Niguel CA

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by Kimball McGinley » Wed Oct 10, 2018 3:21 pm

I have heard it said that reaming Oilite bushing closes off the pores that make them work so well???

Recommended was pushing through a ball the correct size...

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Donhost4449
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Location: Vacaville, CA

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by Donhost4449 » Wed Oct 10, 2018 11:06 pm

8thscale wrote:
Tue Oct 09, 2018 10:21 pm
Donhost4449 wrote:
Thu Oct 04, 2018 12:22 am
As things go, there was a slight bind in the motion. John is studying the rotation to discover the source of the bind.
...
As it turned out, the rear axle quartering was off .009"
Would you please share more information? What was the setup to measure the error?
I've heard of making an offset key. Even if there are no photos any explaination would be appreciated.

Thanks
I checked with John on this, as he did the work to locate the offending driver. John said "Drivers between centers. Crank pin against chuck jaw. Indicator against other pin. Compare readings."
IMG_1367.JPG
As for the .009" correction, he likely pressed the wheel off, filed the key slightly, and pressed back together. I had a quartering correction that I did on my LE mogul, and that is all that was required to make the correction. You can see the end result here.
IMG_8682.jpg
Chris
Building a Fitchburg Northern (build log): www.chaski.org/homemachinist/viewtopic.php?f=45&t=107249

My YouTube Videos: www.youtube.com/user/donhost4449/videos

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Donhost4449
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Location: Vacaville, CA

Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by Donhost4449 » Wed Oct 10, 2018 11:15 pm

Kimball McGinley wrote:
Wed Oct 10, 2018 3:21 pm
I have heard it said that reaming Oilite bushing closes off the pores that make them work so well???

Recommended was pushing through a ball the correct size...
I've never heard that - maybe it does. However, I don't have a ball that is .505"

This is the same method I used to replace the bearings on my LE mogul in 2015, and that locomotive has run hundreds of miles (actual, not scale) since then with no issue.

Chris
Building a Fitchburg Northern (build log): www.chaski.org/homemachinist/viewtopic.php?f=45&t=107249

My YouTube Videos: www.youtube.com/user/donhost4449/videos

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NP317
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Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by NP317 » Wed Oct 10, 2018 11:30 pm

I reamed the Oilite rod bushings on my Ten Wheeler 15 years ago.
Careful inspection under magnification showed that oil holes survived the reaming process.
Those bushings are still looking new 550 miles later.
~RN

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cbrew
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Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by cbrew » Thu Oct 11, 2018 12:50 pm

using a sharp boring bar would do the job opening up the oilite bearing
If it is not live steam. its not worth it.

rkcarguy
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Re: Father & Sons build project: Fitchburg Northern (2.5" scale, 7.5" gauge)

Post by rkcarguy » Thu Oct 11, 2018 3:16 pm

I would say that a dull reamer could roll material into the pores of the oil lite bearing, but a sharp one should cut with no adverse affects.

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