Lionel GP30 Fixed Pilots & Kadees - Updated 7/22

I can't wait to see these things Mario, and the engine after they have been installed. I'm gonna look for a couple more Lionel GP30s now. The only reason I hadn't is because I didn't wanna go through the hassle of Kadee conversion AGAIN. This is going to make life so much simpler.

These look very interesting. i have some Lionel Legacy GP's 7,9 and 35. Would they be so different than an Atlas?

 

Ray Marion

Ray,

 

I will be doing the Legacy GP7s, so I bet that they would be the same for the GP9s.  Maybe I'll have to do those next.

 

As for the Legacy GP35s, I don't know how different that they are from the Atlas or MTH, but we'll find out soon enough.  The big thing is to design everything so the top of the coupler box is at the right height off the railhead.

 

LOS, These are designed for almost plug-and-play, so should be very easy.  The first sets will be printed in white, so it'll be easy to paint to match.

 

Thanks,

- Mario

I'm pretty sure the Legacy GP30 and 35's are the same. I have both and converted both, my guess is that it will take the same pieces.

This is very interesting Mario, and I'm definitely interested as this would save me a lot of time. Good job! 

 

I agree that the 1st Gen TMCC GP30 (With tongue), the 2nd Gen TMCC and Legacy GP30s (no tongue), and the Legacy GP35 (no tongue) all use the same dimension pilot.  Although the mounting is different in each.

 

See below...

 

 

In fact, I'm going to have to cut the tongue off mine anyway... so you're a step ahead!

 

Thanks,

- Mario

Matt,

 

Thanks for the words of confidence.

 

My primary goal in this whole escapade is twofold; have machine-made spacers to convert my personal locomotive fleet (I'm not talented enough to hand make precision pieces) and make it easy for others to do the same.  I'm going for a factory-fit type of solution here...

 

The more people in 3RS, the better.

I may have killed 3 birds with one stone... It looks like the Legacy GP7 uses the same pilot castings... 

 

If the spacers and pilot fill blocks fit all three, then I'll call it a home run.

 

Thanks,

- Mario

 

 

Fantastic work Mario! I was hoping someone would get to this before I could.This is the perfect example of how 3D printing can be a game changer for model railroaders.

 

Would you be kind enough to send me the files? I'd like to load them to Shapeways and get them printed. Come to think of it, you know you could do that yourself and make some money off of each printed part for your trouble. I would be happy to purchase them from you through Shapeways.

 

Thanks,

Jonathan

Centralfan1976 posted:

 

I'm not keeping this idea to myself, if you have access to your own 3-D printer, I can email you the .STL file.  Don't worry, I'll be offering these as sets, as soon as the engineering is finished.

 

Thanks,

- Mario

 

PS - Once this project is finished, here's a list of future pilot spacer projects, in probable order:

 

• Atlas GP35s
• MTH GP35s
• Lionel RS11s
• Lionel Legacy GP7s
• Lionel H16-44s
• Lionel PW GP7

 

Mario,

 

When you get to the Atlas GP60's  I'll need 4 pair.

Very nice work. This looks promising. fabricating spacers and filling in around the draft gear box are among the most tedious chores in fixing pilots. After an initial flurry a few years ago to do the engines I most care about, my enthusiasm for these projects kind of waned. I guess I'll need to find someone with one of those 3D printers.

 

RM

Very neat idea - please put me down for two pair of the Atlas GP35 spacers.

 

Over the last 3 nites, I decided to tackle my first fixed pilot (Atlas GP15).  After taking the _entire_ engine apart, realized I could have probably removed the pilots with only 2 screws!  Oh well, nice learning experience.

Gregg,

 

This is the type of thing that I'm trying to avoid... Over-working a project that should be just a few steps.

 

I know that on engines like the Legacy GP7s, the pilots attach to the trucks, and the Liondrive trucks just twist off and this whole conversion could probably be done without even taking the body off the frame (except maybe to pull the electro-coupler plug from the PCB).

 

Stay tuned for the prototypes to come from the printer, early next week probably.

 

Thanks,

- Mario

IPT and STL files uploaded for your use...

 

Keep in mind that these are the first drawings and I've yet to produce a prototype piece yet.

 

For those of you that don't have access to a printer, I'm thinking of offering these. Stay tuned.

 

Good luck.

Great job Mario. I have a MTH GP7 I'd like to do so if there's any chance that the MTH GP35 pieces would work for the GP7 I would be definitely be interested in purchasing them from you. Keep us posted and thanks for doing this.

Mario

 

    Wonderful work so far. Do you know where the screws attaching all to the engine will be? Will they be inside the body or outside through the decking?

 

Ray Marion

Are you sending them out to Shapeways or doing them at home?

 

Ray,

 

The GP30 front pilot is going to be the easiest...

 

The current body mount screws will come up from the bottom on the spacer, through the slotted holes.  The spacer is 0.172" at this area and designed to fit flat against the underside of the frame.  The slots are countersunk on the bottom side by 0.072" to allow for the pan head screws to be up inside the spacer and out of the way of the truck swing.

 

As for the pilot filler block, it is designed so that the coupler box sits flush against the inside of the square opening and the holes are 0.095" (0.002" over sized) for clearance around a 2-56 x 1/2" screw, with some adjustment / tolerance space.  All 5 holes in the spacer (above the pilot) are 0.090" (undersized for tapping / threading), and this would hold the pilot to the spacer.

 

If you look at the thicknesses:

 

• 0.172" thick coupler box
• 0.134" thick pilot fill block
• 0.100" pilot thickness
• 0.110" pilot / body spacer

With a 2-56 x 1/2", there is ~0.037" head space on the front screws so the screw won't bottom out on the bottom of the frame.  There's even more on the back one.

 

If you want to use the filler block and pilot, but still keep it swinging, a 2-56 x 3/8" will leave a ~0.055" head space above the screw so it won't pop through the top of the pilot.

 

In the rear, I haven't done as much of the engineering because there are no chassis / body mount screws to piggy back their use and attach the spacer to the frame.  But if you want to use Kadees in the swinging pilot, the installation front / rear will be same.

 

I will design something a little smoother for the rear once I get the prototypes back from the printer and disassemble the unit.  Once this engineering is finished, then I will update the drawings to a new revision level.

 

In both cases holes will have to be drilled in the pilot; 3/32" through holes to allow the 2-56 x 1/2" to pass through it and tight into the spacer, and 2-56 drilled / tapped holes in the pilot if you want to keep it swinging.  I'll probably pass at least one of the coupler mount screws through the spacer into the frame to provide a third attachment point for the whole shebang.

 

Whew... the engineering was almost a nightmare.

 

Thanks,

- Mario

 

PS - bad news for Legacy GP7/9/35 owners, the body mount screws are not present in their design, so some other ways of attachment will have to be engineered; probably drilling out the spacer holes to 3/32" and drilling / tapping into the frame.

 

We shall see...

 

 

 

 

Neither, I have a friend that has one (demo unit that I'll probably buy when he's done with it).

 

I know that at least one other has sent them to Shapeways, though.

 

Thanks,

- Mario