RailPro > RailPro Specific Help & Discussion
Install in a P2K S-3?
CPRail:
Picture 3 is the chassis with the mods marked for the LM-3S module
Picture 4 is the chassis with the location for a KA-3. Add in a bridge rectifier (they are teeny), and I might be able to squeeze in a cut down iPhone 4 speaker...
Thoughts from the experts? Am I headed in the right direction?
CPRail:
Oops. Looks like I missed picture 3...
CPRail:
Okay Gang, I'm miffed.
Thought I had this install in the bag (see the Install in a P2K S-3 thread for my plan). As I'm off during the holidays, I figured here's my chance to work on it.
I made the cuts/grinding as planned. Things were going well, when I found out that the K-A wasn't going to fit and that the LM-3S was bumping up against one of the weight mounting screws. No biggie, just ground out a notch for the LM-3S plugs to squeeze past the screw and do some grinding to open up some space for a sugar-cube and things should fit - especially if I hard wire everything to the 9 pin plug. K-A TBD, but should be able to do something.
Then I got cocky... Figuring I'd need some extra play, I cut slots in the weight to open up the holes where the wires pass through the weights. All going well until I cut out the last slot and the weight snapped where I removed material for the sugar cube.
Pause, listen to hockey game, don't throw unit across room...
Figuring I'd have to make some kind of mount out of styrene, I pulled the weight and started fiddling to see how everything would fit. Turns out the LM-3S is just a wee bit too wide to fit nicely in the hood. Argh!
I know some of the experts here have unwrapped a LM. What does that gain me? Can I spread pieces around? Other than pooching the warranty, what other issues might doing this cause?
Those P2K S3s are light to start with, so I'd like to add weight if I could in the install.
Thoughts, comments, rude remarks?
G8B4Life:
--- Quote from: CPRail on December 27, 2017, 10:23:31 PM ---I know some of the experts here have unwrapped a LM. What does that gain me? Can I spread pieces around? Other than pooching the warranty, what other issues might doing this cause?
--- End quote ---
Removing the plastic case gains you (read removes) about 1mm of of width. That 1mm might just be enough to fit the LM into the hood. You'd want to wrap the now exposed board with Kapton tape like Alan did. I wouldn't recommend heat shrinking it unless you has access to some good equipment for doing so.
No, you can't "spread around" the parts on the board.
--- Quote ---Those P2K S3s are light to start with, so I'd like to add weight if I could in the install.
--- End quote ---
I know this isn't exactly what you asked but does the top weight keep the motor in (secured in place) at all? If not I'd be inclined to toss it. It'd be providing very little weight value to the model so if you did away with it you could possibly secure the LM to the motor directly (or make a small styrene shelf) and then you might have room in the shell for something heavier than the diecast weight.
If you'd really like something heavier, you could always go the way of Jim FitzGerald and his "Cotton Brute"'s :D Google that one if your not familiar with it.
- Tim
William Brillinger:
Ian,
Looking at Alan's unwrapped LM-2 I'd say you can gain more than just the space.
( Images from http://model-railroad-hobbyist.com/node/18968 )
with some surgery to the plugs, you can solder directly to the board and gain some length and height too.
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