Tim Humphreys ex Mudhen
Western Thunderer
Martin,
Bring it along to Bristol, we can have a look and perhaps offer assistance.
Tim
Scale7 JB Workbench.
- Thread starter Scale7JB
- Start date
Martin,
Bring it along to Bristol, we can have a look and perhaps offer assistance.
Tim
Eastsidepilot
Western Thunderer
Scale7JB
Western Thunderer
SWill try and get a few more bits done tomorrow before its big debut. It'll have a big clean before then with glass fibres all over the shop and fingers!
Although 5 laminations per brake hanger/shoe, im very pleased with how they've come out.
I've spent the last couple of hours trying to justify the boiler dimensions, but I can't quite... Strange thing being that the boiler can't go down any further and the top of the firebox is the correct distance from the top of the cab. A chimney casting from LG on Sunday may change the look of things. Unfortunately he has run out of dome's, if you make it down I'll tell you why that may be a good thing. I still need to do a V2.0 etch for the body, and the first thing will be to make the smokebox rivets a whole lot bigger. I was erring on the side of caution when I first drew it, a bit too much.
Ejector elbow is a work of pure fiction in terms of design just to have something to put in there other than bent wire.
JB.
Although 5 laminations per brake hanger/shoe, im very pleased with how they've come out.
I've spent the last couple of hours trying to justify the boiler dimensions, but I can't quite... Strange thing being that the boiler can't go down any further and the top of the firebox is the correct distance from the top of the cab. A chimney casting from LG on Sunday may change the look of things. Unfortunately he has run out of dome's, if you make it down I'll tell you why that may be a good thing. I still need to do a V2.0 etch for the body, and the first thing will be to make the smokebox rivets a whole lot bigger. I was erring on the side of caution when I first drew it, a bit too much.
Ejector elbow is a work of pure fiction in terms of design just to have something to put in there other than bent wire.
JB.
richard carr
Western Thunderer
JB
With the chimney etc it does look a lot better.
Richard
With the chimney etc it does look a lot better.
Richard
Scale7JB
Western Thunderer
Thanks Richard!
I did spend a good amount of time with @Dog Star and with fresh eyes pulled some very valid points, including the length of the Smokebox. You're right, it is too short by about 0.8mm in the area where the smokebox meets the saddle. Another 1mm in length will help to beef up that area a little.
I also found last night that the cutout for the boiler in the front cabsheet is the correct size for the boiler which is a small mercy as that won't need to be redrawn.
JB.
Scale7JB
Western Thunderer
Hi JP, not just yet, I think I will have to do one for myself. At least that way I can maintain the standard of the kit too.
I had a quick look at the very similar 3500g tender by DMR at Bristol yesterday....
You could convert the deep valance version to the non-valance version....but you'd be nuts! It's almost different enought to be a different class of loco.
Different:
Footplate
Valance
Splashers
Cab front
Cab frame and overlays
Firebox wrapper
JB.
I had a quick look at the very similar 3500g tender by DMR at Bristol yesterday....
You could convert the deep valance version to the non-valance version....but you'd be nuts! It's almost different enought to be a different class of loco.
Different:
Footplate
Valance
Splashers
Cab front
Cab frame and overlays
Firebox wrapper
JB.
mickoo
Western Thunderer
.......... found the cranks are 1mm too wide.
Scale 8 maybe
I hate it when that happens, measure once, measure twice.....and it still doesn't fit.
Scale7JB
Western Thunderer
You're right, you're absolutely right.
I had measured up against the slidebars and cylinders and got a measurement. Then built up the axle. Checked to see if it would fit between the hornblocks and it didn't. And then it was still out of alignment with the cylinders by 1mm.
I'm secretly happy about it as it means it will definitely fit between the hornblocks at the correct spacing for the cylinders without me having to take any meat off of the hornblocks, which I'm loathed to do these days as it does seem to reduce the life of the hornblocks eventually causing wear and ovaling of the hornblocks leading to sloppy wheel sets.
JB.
I had measured up against the slidebars and cylinders and got a measurement. Then built up the axle. Checked to see if it would fit between the hornblocks and it didn't. And then it was still out of alignment with the cylinders by 1mm.
I'm secretly happy about it as it means it will definitely fit between the hornblocks at the correct spacing for the cylinders without me having to take any meat off of the hornblocks, which I'm loathed to do these days as it does seem to reduce the life of the hornblocks eventually causing wear and ovaling of the hornblocks leading to sloppy wheel sets.
JB.
Eastsidepilot
Western Thunderer
Scale 8 maybe
I hate it when that happens, measure once, measure twice.....and it still doesn't fit.
Big 'ammer ' .........
Col.
mickoo
Western Thunderer
They look good, but that's an awful lot of cusp to clean off 
Are you just doing the main connecting rods, or will the eccentrics come later. I'm not familiar with the prototype but I've not seen under slung slide valves before, that must make the internal steam passages interesting to cast (1:1).
Are you just doing the main connecting rods, or will the eccentrics come later. I'm not familiar with the prototype but I've not seen under slung slide valves before, that must make the internal steam passages interesting to cast (1:1).
Scale7JB
Western Thunderer
Thanks Mick,
I'm not gonna lie, they're not up to the standard of Laurie's inside valve gear, but these will save probably £50+ on the price of a kit. I won't be doing the eccentrics and expansion links, I just don't think you'd see enough to warrant for a standard build, I just wanted to offer something to fill the gap and have something moving under the boiler.
Yes the valves were under the cylinder. I've seen it on a few locos, one in particular (can't remember the prototype) the lead axle was slap bang in the middle of the point from expansion link to valve chest, and so the valve rod had a 'D' shape that went both below and above the axle.
I have drawn up the cross heads, but alas the holes for the little end pin aren't low enough causing the connecting rods to collide with the ends of the slide bars. Another amendment.
JB.
I'm not gonna lie, they're not up to the standard of Laurie's inside valve gear, but these will save probably £50+ on the price of a kit. I won't be doing the eccentrics and expansion links, I just don't think you'd see enough to warrant for a standard build, I just wanted to offer something to fill the gap and have something moving under the boiler.
Yes the valves were under the cylinder. I've seen it on a few locos, one in particular (can't remember the prototype) the lead axle was slap bang in the middle of the point from expansion link to valve chest, and so the valve rod had a 'D' shape that went both below and above the axle.
I have drawn up the cross heads, but alas the holes for the little end pin aren't low enough causing the connecting rods to collide with the ends of the slide bars. Another amendment.
JB.