Atlantic 3279 wrote:Yes, I like it!
'Tis a bit awkward about the motor width. I'm not sure whether the avoidance of that problem would actually have justified the extra work needed to add the fourth coupled wheelset to the front of the original unit, shifting cylinders and motion bracket forward in the process (or cutting and splicing two chassis at a point further forwards).
Agreed, I may be wrong but I could not quite see a viable route by adding the wheelset in front, and I felt the motor should drive onto the second axle from the front.
Atlantic 3279 wrote: Measuring my spare Margate "Royal Lancer" body there is certainly width to accommodate a 14mm wide Mashima flat-can over the leading coupled wheels, and a 1428 or 1430 if you can get one would gives bags of power (and just as importantly, torque). As you've evidently got the motor out now anyway, you must be well placed to see whether a bit of ingenuity would allow the transfer of the worm gear to a Mashima (preferably without wrecking the bearings/armature in the old motor through rough pulling of the gear), and the mounting of same in the chassis. If you are stuck, let's confer further on the point, I'd be interested to see this one solved without recourse to notchy Ringfield tender drive or expensive Bull-Ant unit. The power is after all best placed in the loco.
If you end up with a spare Hornby motor or two, with or without worm gear, either you'd have a handy spare for the future or you could flog them off. Good luck.
There seems a lot of merit in the Mashima route Graeme. Not having ever fitted one though, could you tell me whether it would fit in the rear upright motor bracket or would I have to fabricate a new one?
Atlantic 3279 wrote: Of course, if you don't fancy interfering with motor and gears, you could scrape / chisel / file / mill an extra 1mm out of the thick boiler sides to open the motor slot up to something like 17mm, as far forward as the new leading edge position of the existing Hornby motor. That does have the cosmetic disadvantage of raising the visible lower edge of the boiler to splasher-top level or thereabouts in areas both fore and aft of the third coupled axle.
I had wondered about that but Saint Johnstoun had rather put me off. I think he may have tried it and found it impossible to achieve a satisfactory result.
Atlantic 3279 wrote: Just been looking at your image 88 and thinking again EM. Although you've filed flat the "bed" area for the motor in the aft portion of chassis, you still have the option to unscrew the rear upright motor bracket and it move it backwards to the position available on your aft chassis piece. If you can then pull the worm gear with sufficient care, and find (or slim down) a piece of rod to match precisely the armature shaft diameter as well as piece of tube that fits (or can be bored to fit) perfectly over the shaft, there's the possibility of extending the shaft at the front of the motor to mount the worm gear where you want it, forward over the pinion wheel. You'd have to instal some sort of bearing where the front of the motor previously was, to support the extended shaft and keep the gears correctly meshed, and probably a new bracket to hold the front of the motor in its new position, but (surely?) those tasks can't be impossible. You can then retain your original motor, but inside part of the body in which it WILL fit without and butchery, save for any minor trimming to relieve tight spots that (by the look of my spare body) might occur around the base of the inside of the backhead.
Yes I had been mulling over that same idea, rather similar to a propshaft. Trouble is I have never dismantled a motor/worm gear - are special tools required?
Some careful consideration of alternatives is needed here, and at the snail's pace my projects move at
, there should be ample time for that!
Altough I currently have nowhere to run my models, I am not sure that in the illustrious company I have on this forum, I can get away with a static model which is the easy option!
Many thanks for the constructive advice as always Graeme.
Having been in a client's IT Meeting all day today, it has been relaxing to file away the boiler bands and moulded handrails, removing the round dome in the process. Of course, the boiler glue joint was not strong enough to stand that kind of manhandling! No big deal though!
I'll try and post some more pics later including the two body halves showing where I made the cuts.