Prompted by a mega thread on RMweb (and an enthusiastic customer) I’ve completed the drawings for a set of loco frames that, it’s hoped, will make like much easier for those who want rarer locos but who don’t enjoy assembling etched brass kits.
The renderings represent a MR 1F 0-6-0T which is part of a batch of MR and S&D Johnson kits that will be put into production in the first half of next year. The main part of the frames is cast in brass and the keeper is sintered nylon. Etched phosphor-bronze strips are attached to the keeper to for the pickups. This particular set of frames is a test piece to test the fit of the keeper, it is intended that the frames that are included in kits will have the footplate and splashers included in the cast. With luck this set will be ready before Christmas and then work can start on the production frames.
Constructive comment welcome.
MR 1F 0-6-0T cast frames.
Components of cast frames for a MR 1F 0-6-0T
This is a quote from a posting on the Shapeways forum:-
WSF is just Nylon 12 – I believe since Shapeways use EOS machines it’s
probably PA2200. I imagine though that right now PA2200 is becoming
very hard to come by for Shapeways since a factory explosion in Germany
about 2 months ago decimated worldwide stocks of Nylon 12 for all
industries, and afaik, EOS has now completely run out of PA2200.
There has been no response from Shapeways about this. So I don’t know what the situation will be, whether they will offer a substitute material or just withdraw WSF. It is likely that the German factory will be out of production until around October, so the supply of the new underframes & bogies is going to be uncertain until then.
I’ve had a prototype of one of the promised coach kits to work on over the last couple of weeks. It has taught me some interesting things about the sintered nylon I used. Basically while it will make acceptable underframes and roofs, getting the good finish needed for a coach side is all but impossible. So it’s one step back and one to the right and I’ll have to go off in a slightly different direction until the technology catchs up with me.
I had an enquiry this morning about some SECR coaches, and it may be worth posting much of my reply here to show everyone the way I’m thinking.
I’m working on a system to provide complete kits for most of the etched
coaches in the 4mm catalogue. This will consist of the body etch, more
or less as supplied at the moment, a roof, a floor/seat unit and one
piece underframes and bogies. Leaving the modeller only to supply
wheels, paint, glue etc. The price is likely to be in the region of
£70-80 depending on the prototype.
I’m also working on a alternative version of this system that uses cast
resin sides and ends instead of the brass ones. This has the potential
to be offered painted and ready to run, but is somewhat further away.
This latter item is the way I’m intending to produce the lits advertised in the coach kit section of the main website.