a bit more progress... axleboxes all finished which are split, and the chassis wheeled. ive mixed up a basecoat of paint approximating to Stroudley improved engine green to protect the cast iron wheels getting dirty and soaked in oil
thanks guys for your kind words and encouragement!
wheels now quartered and fitted and a trial 'roll' with the coupling rod blanks drilled and fitted on temporary crankpins and all seems to turn sweetly. long labourios job now of hacking the coupling rods to shape, which isnt my favourite job!
What a great job you are doing of the terrier! I am also building one. A few years back I bought a part built Martin Evans model with full intentions of 'just' finishing it off. However I am a real sucker for having things rite. So took the whole thing apart and started measuring. What a big mistake that was!! 2 and a half years on.. I still have bits of a part built terrier which I attempted to alter and are now scrapped. So in other words I have started from scratch. Working from works drawings and measuring full size locos I am on with something that actually looks very similar to yours. The only bit left of the original engine are the wheels, and even them I had to fettle the spokes and shrink new steel tyres on. It is really enspiering seeing someone else making the effort to get it rite!
glad to hear about your Terrier, and hope you are still enjoying putting things right from martin evans' BOXHILL design.
it is a shame that martin evans made lots of pointless departures from the fullsize Terriers.
there are a few of us doing the same. in my case i am aiming for an efficient working loco incorporating my own ideas how things should be to achieve this, and correcting martin evans' errors as i go along to produce something that i hope is close to the fullsize STEPNEY.
luckily, apart from the cylinders and crankaxle which i made to drawing many years ago, i have started from scratch, and have quite a lot of info on the fullsize Terriers.
i have also been very fortunate to have received a lot of advice and help from other members of the forum, as previous posts show.
it would be great to see some pics of your own Terrier!
This one shows the front of the cylinders, which are machined from solid. They are roughly similar to Martin Evans, but i have changed the top and bottom faces for various reasons. The top has the rim around so that the smokebox can be bolted directly to it like the prototype. I am modeling the A1 version of the terrier, so this is differs from Evans' use of smokebox sadle. the under side has luggs ready to accept the draincocks.
This one shows the motion bracket and slide bars, which are obviously differant to the common bars that were used on various model designs. I have had to re design the usual Evans vale gear somwhat to get this to work. (thats where the CAD came in handy) however the general dimentions of the motion is very similar to that of the boxhill design, and as it looked to animate ok in the CAD program i thought i'd best stick to it. :-)
All the bits are temp fitted so as to check it works. this is the reason for some parts looking a little rough.
john, many thanks for posting your pics... what an excellent job you are doing! from knowing the fullsize locos too i can appreciate all the extra work and detail you have added... such as proper leaf springs and channel section slidebars. the motion plate looks superb! i have (after much head scratching) also worked a way of fitting channel section slidebars. gosh, yours is even correct to details such as the 'onion' shaped oilers! i am inspired and encouraged! cheers, julian
the motion plate was machined from a solid block of steel using teroidal cutters to give the correct size fillets etc. As for the onion oil cups, they are hollowed out inside as well to the same shape as the out side.
Like Julian, I’m trying hard to produce a reasonably accurate Terrier, as indicated in a previous post to this thread. However, my continuing valiant attempts to make a ‘silk purse’ from Martin Evan’s ‘sows ear’ requires construction compromises which may forever be a source of irritation. But it is a mid 1960’s design though and this should be kept in mind.
Your photos show some excellent manufacturing of various components, in particular the motion plate which, had you not said, I would have said was a precision casting.
Are you modeling a particular prototype? I note you have made up buffer supports which presumes it was modified for motor-train operation, ie with the raised buffer height.
Although some time away yet the thought of joining yourself and Julian for a ‘Terrier’ get together is very appealing.