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Diesel 40" wheel specification
https://rypn.org/forums/viewtopic.php?f=1&t=36257		 Page 1 of 1
Author:  Owen S. Paulsen [ Wed Feb 19, 2014 1:24 am ]
Post subject:  Diesel 40" wheel specification
When the Index Groove (Witness Groove) is what an show maximum what distant to tread of the wheel.
I say it Witness Groove =36" a the tread of the new wheel.

If you take Witness Groove =36" away about will a 1. 1.5 or 1.75 go, So flange in O.K.
Correct?
I you take Witness Groove =36" away about will at .25, So flange in O.K.
Correct?
Am I right the this?

Stan Paulsen

Attachments:
File comment: The is front side a measurement a take on TOP witness Groove.
If you had made 1 inch plus .25 more to wheel turn in you flange O.K.
wheeldiametermeasurement.pdf [25.6 KiB]
Downloaded 623 times
Author:  David Johnston [ Wed Feb 19, 2014 1:46 am ]
Post subject:  Re: Diesel 40" wheel specification
The witness groove on a 40 inch diesel wheel is there because there are times that the inboard corner is so full of dirt and grease that is can not be used with the steel wheel gauge to determine rim thickness. In this case the gauge can be turned around and the rim thickness can be read using the outboard groove. Your own situtation will determine what the condemning limit is.

Flange height is still read with the steel wheel gauge with the long leg on the inboard side of the flange and the finger touching the gauging line. Again, your own situation will determine the condemning limit.
Author:  Lincoln Penn [ Thu Feb 20, 2014 3:34 pm ]
Post subject:  Re: Diesel 40" wheel specification
Isn't the witness groove on a 40" wheel at 38"?
Author:  superheater [ Thu Feb 20, 2014 4:46 pm ]
Post subject:  Re: Diesel 40" wheel specification
What is a "witness groove"?
Author:  Howard P. [ Thu Feb 20, 2014 5:42 pm ]
Post subject:  Re: Diesel 40" wheel specification
Attachment:
1004131341.jpg
1004131341.jpg [ 212.63 KiB | Viewed 8668 times ]


The slight groove around the edge of the rim, just inboard of the point the wheel "breaks" to curve toward the wheel center, is the witness groove. In the photo, it passes though the lower part of the chalked numbers/letters.

Howard P.
Author:  PCook [ Thu Feb 20, 2014 6:10 pm ]
Post subject:  Re: Diesel 40" wheel specification
I wonder if the model railroaders have caught on yet to painting traction motors that way.

PC
Author:  etalcos [ Thu Feb 20, 2014 10:54 pm ]
Post subject:  Re: Diesel 40" wheel specification
Rim thickness for condemning and wheel shop purposes is taken at the back rim face, and using a scraper if needed to get rid of the crud. The witness groove is there for wheel size matching and shimming purposes (think minimizing wheel slip and leveling of trucks). Experience has taught that this does make a difference -- we had two wheels "condemned" for thin rim that suddenly became legal when properly gaged. I have used the measurement off the front rim face when close is good enough, but when it really matters, measure off the back face.

Now on a more important topic, I wonder what Howard has that uses an 83-20, GE, Hyatt wheelset??? Hyatt + GE was an unusual (non standard) combination on most roads.

ETA
Wheel Pit, Tennessee
Author:  HudsonL [ Thu Feb 20, 2014 11:10 pm ]
Post subject:  Re: Diesel 40" wheel specification
Quote:
Now on a more important topic, I wonder what Howard has that uses an 83-20, GE, Hyatt wheelset??? Hyatt + GE was an unusual (non standard) combination on most roads.


A EMD with Alco trucks?

-Hudson
Author:  MEC_557 [ Fri Feb 21, 2014 6:51 pm ]
Post subject:  Re: Diesel 40" wheel specification
HudsonL wrote:
Quote:
Now on a more important topic, I wonder what Howard has that uses an 83-20, GE, Hyatt wheelset??? Hyatt + GE was an unusual (non standard) combination on most roads.


A EMD with Alco trucks?

-Hudson


They are planned to go under New Haven RS-3 #529
Author:  Owen S. Paulsen [ Mon Feb 24, 2014 6:02 pm ]
Post subject:  Re: Diesel 40" wheel specification
I think this do same front Witness Groove an and FRA Thin rim a back side.
The only that in left do in flange: high to 7/8 correct? An a Flange Height Measurement show amount the for height will read.

A Height a back side for W601A (say height on 1 1/16 at STD 0 on 17 what STD mean a what do find place a W601A.


Stan

Attachments:
File comment: The Height measurement an bottom back face.
flangeheightmeasurement.pdf [20.85 KiB]
Downloaded 608 times
File comment: Rim Thickness Measurement an bottom back face.
flangethicknessmeasurement.pdf [42.31 KiB]
Downloaded 613 times
File comment: FRA Thin rim 1 inch condemning Road Loco.
The from back side -1 inch or 16 " of inch.
railroadgage.com_pdf_TD5FRARL.pdf [13.07 KiB]
Downloaded 606 times
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