LGB Dual Uncoupler Ramp

Last crawled date: 10 months ago

This is a set of files which I have designed to replicate the LGB style uncoupler. This allows twin-hook stock to be uncoupled without the need for a permanent uncoupler (these have always caused issues).

You will need to replace the fishplates with rail camps - I used TL45 clamps as they are shorter than Massoth. This allows the sleepers to be slid together, bringing the two ramps closer, producing an uncoupling 'sweet spot'.

The kit includes a crank rod set to allow one drive motor to actuate both ramps, this will require the 'Uncoupler Ramp Actuator Driver' which has connections both ends.

This can be used with an existing LGB uncoupler (LGB 10560) or the whole set can be used for both ramps - the print files include 'Uncoupler Ramp Body LGB' which is a copy of the LGP body, and Uncoupler Ramp Body which has been shortened by 8mm to bring the ramps closer together.

Print settings used:

ABS (Can be PLA if used indoors)
0.06mm layer height (to make the ramps nice and smooth - can be 0.1mm)
100% Infil
Supports - some are hard to remove, espeicially inside the Ramp.
I used 'breakaway' support which seemed to work best.
All parts are (should be) oriented the correct way for printing.

Body - print flat side down, with supports. The support material can be a pain to get out of the small pockets on the underside.

Rear Mount / Front Mount / Actuators / Link arms / Arm mount / Link Rods - flat side down.

Ramp - Ideally this would be printed with the hinge pins at the top. However this leaves a rough surface on the top slide of the ramp - can be removed with much sanding, not to my taste.
I have printed this with the hinge pins down, with support. Getting support out of the inside is a PITA. Watch out for the hinge pins.

Inner - print with centre hole facing up. Filing of the actuator pin is required. You will also need to file the end stop nearest the open hinge - this is to set the ramp angle. This has been left it 0.1mm too big to allow filing to fit. If not filed and set properly, the ramp will not sit fully down.

Big thanks to phils2um for the original idea and R&D work.