P4 Conversion of Bachmann Split-axle Bogies
Posted: Fri Mar 13, 2020 5:41 pm
Some Bachmann RTR vehicles come with split axles with electrical pick-up through the axle bearings. They run very freely but, unfortunately, some types are too narrow for P4 wheelsets. Here’s how I widened the bogies of a Bachmann/Kernow 4TC.
1. The bogie as supplied:
2. Pop the wheels out and unclip the brake shoe moulding
3. Undo the two tiny screws to release the pick-up/bearing strips
4. Score along the top of the longitudinal part of the frame and snap off the sides
5. Make up new stretchers from 60 thou plasticard for each bogie; the rectangular slots don’t need to be accurate but it’s best if the 2.0mm holes are.
6. Slot the bogie sides into the new stretcher – the posts for the screws go through the holes and the contacts that take power up to the coach go through the slots
7. Refit the pick-up strips to the bogie sides and reinsert the screws – this clamps the new stretcher to the bogie sides
8. Re-assembled bogie from above
9. Glue the longitudinal part of the bogie frame to the new stretcher, butanone works well
10. View from below
11. Cut the brake shoe moulding into five parts as shown
12. Glue the brake shoe parts to the bogie ensuring clearance from the wheels– butanone works here too. These 12mm wheels are sold by Branchlines for conversion of the Bachmann DMU centre cars; they use the plastic centre bush from the original split axles but I have also made replacements from plastic tube so I can sell on the complete OO axles. Other wheel sizes will need an alternative source of split axles.
13. Finished bogie, you could probably get away without the brake shoes
1. The bogie as supplied:
2. Pop the wheels out and unclip the brake shoe moulding
3. Undo the two tiny screws to release the pick-up/bearing strips
4. Score along the top of the longitudinal part of the frame and snap off the sides
5. Make up new stretchers from 60 thou plasticard for each bogie; the rectangular slots don’t need to be accurate but it’s best if the 2.0mm holes are.
6. Slot the bogie sides into the new stretcher – the posts for the screws go through the holes and the contacts that take power up to the coach go through the slots
7. Refit the pick-up strips to the bogie sides and reinsert the screws – this clamps the new stretcher to the bogie sides
8. Re-assembled bogie from above
9. Glue the longitudinal part of the bogie frame to the new stretcher, butanone works well
10. View from below
11. Cut the brake shoe moulding into five parts as shown
12. Glue the brake shoe parts to the bogie ensuring clearance from the wheels– butanone works here too. These 12mm wheels are sold by Branchlines for conversion of the Bachmann DMU centre cars; they use the plastic centre bush from the original split axles but I have also made replacements from plastic tube so I can sell on the complete OO axles. Other wheel sizes will need an alternative source of split axles.
13. Finished bogie, you could probably get away without the brake shoes