Tag Archives: Atlas O EMD F3

Atlas O EMD F3

WB: Drop-In Conversion Parts

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Original Atlas O axel assembly and the NWSL Conversion Wheelset

“Drop-In Conversion Parts” that is such a nice phrase. It’s not always a reality.

If you read yesterday’s post you know of my troubles installing the NWSL conversion wheelsets into the Atlas O F3B. To recap the back to back of the ridge on the bushings needed to be at least 0.496″.

The NWSL parts had a back to back measurement of 0.488″ – 0.490″.

I know it’s only 0.006″ – 0.008″ difference but that is the difference of them fitting or not.

Time to disassemble the first axel.

This was the before measurement for the bushing.

This is the bushing’s measurement after it went on a diet.

The new back to back measurement. And the most important thing….. They ACTUALLY were a drop-in fit into the grove on the top cover.

After modifying the two axels that didn’t fit, I had to open up the one truck where the axels did fit. I knew they were a very tight fit and just thought they would benefit from also being modified in the same manor.

I am happy to report that this last photo shows all four axels modified and installed. Next time I work on this model, those side frames need to move a lot closer to the wheels, but that is work for another day.

Truth be told, it took about the same amount of time to write this post as it did modify the bushings to make the axels fit properly. So it really wasn’t a big deal at all.

I’m still bothered that the conversion parts did not fit as delivered from NWSL. I’ve been modeling in Proto48 since the early ’90’s, I know there is no instant gratification in Proto48. We have to actually work on our models.

What if I was a newcomer to Proto48, this experience would have been very discouraging. It could have easily made me question if modeling in Proto48 was worth the extra effort. Sometimes the newcomer to Proto48 needs some simple wins to give them the motivation to keep going and try more difficult projects. This type of Proto48 conversion should be one of those simple wins.

Thankfully, the remedy was painless.

WB: It’s Snowing Outside

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Well it’s nasty outside this morning. Here in New Jersey we are experiencing a nor’easter moving past us just off the coast. They have blizzard conditions down at the shore. Just snowing and high winds here. I’m waiting for the snow to stop to go clear the walks later today. A great time to sit down at the workbench.

I had a friends model in to have the trucks repaired. That is his Pecos River Brass PRR G30 gondola sitting there on the bench. The springs came out of one of the trucks. It just needed to have the springs re-installed. Simple enough fix.

My friend wants to put this model out on the table at the Chicago show this year, so if you are looking for one of these fire off an email and I’ll pass it on to my friend.

Behind the PRR G30, you can see what remains of this week’s small project. I picked up an Atlas O CNJ F3B dummy at the last Strasburg Show. I was able to aquire a drive donor (the CB&Q F3A), the swap of the two drives went easy enough. Only little hick-up was the position of the front step. The hole for the B-unit location needed to be tapped to allow me to mount the step into the position under the door.

Since it was on the workbench still, I pulled out the conversion set I had purchased from North West Short Line for the Atlas O F3. The idea is that they are meant to be a direct replacement for the O Scale wheelsets.

Take off four screws and the cover plate on each axel and replace the wheel set. Simple, Right?

Well it started out that way. You can see the replacement wheels installed on this truck. They were a little tight but I was able to get them into the truck. We won’t talk about the language used to help guide them into the truck.

The second truck was not as simple. The wheels didn’t fit.

Here you can see the axel cover removed from the Atlas truck. The two brass bushing are meant to fit into the grooves on the cover and also on the truck center.

The groove has a back-to-back distance of 0.496″.

But the bushings on the NWSL conversion wheels had a 0.488 back to back spacing. Looks like they are not so “drop-in” a replacement. There is no way these could EVER fit into that truck.

I can pull the non-geared wheel off, which will allow me to remove the bushings from the axel. Then I should be able to mill down the thickness of the bushings to give me the needed clearence. Then I’ll have to reassemble the axels again.

BUT this ALL should not be needed on what is supposed to be a drop in replacement part. At $64.95 USD (plus shipping) per conversion set they should work as a conversion set and NOT be a conversion PROJECT. I’m not a happy NWSL customer at this point.

For those that want to know. I have two sets of the NWSL Altas O F unit replacement wheelsets. Only two out of the eight axels I measured will actually fit into the Atlas O trucks.