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Hornby Drummond 700

Posted: Sun Jan 13, 2019 7:47 pm
by Hardwicke
Anyone converted a Hornby 700? I know the handrails are wrong. Anyone changed the handrails too? Are wheels available or straight swap/ easichas?

Re: Hornby Drummond 700

Posted: Sun Jan 13, 2019 8:52 pm
by Philip Hall
I’ve done one in EM and have one for myself in P4. I don’t think I’m going to do anything about the handrails, as they are not too bad from a distance and replacement will be fiddly.

Two potential problems:

1. Clearance inside the splashers. I had to clear out space for EM wheels so P4 will be tighter. Just enough room for 1.85mm wide wheelsets but Alan Gibson are 2.00mm. The cab splashers are part of the cab side die-castings so are unpleasant stuff to mill out clearance from.
2. Alan Gibson wheels are set to a greater crankthrow than the prototype, 12”, the correct is 9”. I can’t remember whether these wheels are ready drilled for crankpins or whether you have to drill them yourself. If the former you have to plug and redrill, if the latter you have to ignore the dimple and drill correctly. I know this because I didn’t realise the problem and had a huge amount of hacking to underneath the footplate to get it to run without the rods clouting everywhere. With hindsight, it also looks wrong.

Otherwise it runs beautifully, well worth doing. I don’t know if an Easichas is available, but won’t use one on mine anyway because it runs so well as it comes. I’ll try and find a photo of the EM one later this evening.

Philip

Re: Hornby Drummond 700

Posted: Sun Jan 13, 2019 9:24 pm
by Philip Hall
Picture of the EM one as promised. You can just see where I had the grief with the excess throw of the driving wheels, all splashers had to be widened inside and there wasn’t a lot left. On this engine I experimented with drilling the crankpin holes out and tapping 10BA for the Hornby crankpins. I shan't do that again as it was dickens of a job to hold the pins to screw them in vertically.

IMG_1626.JPG

Re: Hornby Drummond 700

Posted: Sun Jan 13, 2019 10:13 pm
by Hardwicke
What size and spoke are they? No access to my books tonight....

Re: Hornby Drummond 700

Posted: Mon Jan 14, 2019 8:59 am
by Mark Tatlow
Phil,

What was the dimension between splashers before and after you went a grinding? I have a J36 on the desk and suspect I have a similar issue.



Mark

Re: Hornby Drummond 700

Posted: Mon Jan 14, 2019 11:24 am
by Philip Hall
Michael,
No idea, sorry, I don’t have the engine now. The wheels were supplied with the engine, and I believe they were the standard Alan Gibson conversion pack. I have another set for my own one but they are 1/8” axles for a kit build I was going to do one day (until I got a set of Sharmans instead). These ones are not of current production - see my last comment below.

Mark,
I would have to measure the one I have to do for my railway, but am not able to access it at the moment. As far as I can recall I worked out that 1.85mm wide wheels would just about fit, 2.0mm would need a bit of hacking. So not much will hopefully be the answer. Most of the clearance problems were self inflicted by dint of not noticing the excess throw of the supplied wheels. Because I also used the Hornby crankpins, I couldn’t reduce the size of the bosses as I usually do, which of course made the clearance problem even worse...

It may well be that current wheels as supplied by AG do have the correct 9” throw, so will pay to check which wheel they supply in the conversion pack.

Philip

Re: Hornby Drummond 700

Posted: Mon Jan 14, 2019 6:34 pm
by BorderCounties
Mark

Just measured my J36 - 21.24mm between the splashers - grinding will be required. At least the measurement is consistent.

Re: Hornby Drummond 700

Posted: Tue Jan 15, 2019 9:31 am
by CDGFife
My mate Ian Terrell has done a Hornby 700 which has run a couple of times on Cadhay. It looks lovely but the comment was that he'd had to take "as much as I dared" from the back of the splashers to get the Gibson wheels to fit. Still it's run pretty well.

As you might imagine we've also had some discussion up here about the J36 and the consensus now several have their hands on them is that the splashers will require similar work.

Chris

Re: Hornby Drummond 700

Posted: Tue Jan 15, 2019 10:12 am
by Philip Hall
Another possibility would be to try and reduce the width of the Alan Gibson wheels, by taking off the tyres and filing the front carefully. Obviously how much depends on the thickness of the front of the recess in the tyre. I would not try this with the tyre in place because there would be no way of telling how much you can take off. If anything!

Philip