Rack locomotive of 1812

Rack locomotive of 1812

This topic has 7 replies, 3 voices, and was last updated 13 July 2010 at 19:25 by John Stuart 1.

Viewing 8 posts - 1 through 8 (of 8 total)

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23 January 2010 at 10:04 #47724
Eric Cox
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@ericcox50497
The drawing and photograph of part 33 (piston rod) shows the rod being 3mm dia. with a 5.5mm dia lip. The text says the end should be turned down to form a shoulder. Which is correct.
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23 January 2010 at 10:04 #38727
Eric Cox
Participant
@ericcox50497
23 January 2010 at 16:30 #47739
JasonB
Moderator
@jasonb
I would say that the shoulder and lip are the same thing, the short end being turned to suit the 6ba thread.

Jason
25 January 2010 at 09:03 #47808
Eric Cox
Participant
@ericcox50497
The end is turned down for the 6BA thread but from a 3mm Dia. bar, so where does the 5.5mm come from.
25 January 2010 at 12:33 #47825
JasonB
Moderator
@jasonb
If you look at the drawing and the photo there is a 5.5mm dia flange thats 1mm thick and 11mm from the the end. You will either have to it from 7/32 reducing teh ends to 3mm and 0.110 or silver solder a flange onto some 3mm rod and just turn the top down to 0.110 for the 6BA thread.

I assume the cross head bears against this flange and is retained by the 6ba nut

Jason
14 June 2010 at 20:05 #52658
John Stuart 1
Participant
@johnstuart1
On the boiler drawings in ME is there an error on the measurements of the bosses as the numbers just don’t add up, I have moved the safety valve bosses to 15mm from the ends of the boiler, next also on the boiler layout the fire tube/box is 6mm longer than the boiler and I imagine the fire box door sits on this 6mm but on the drawing it shows it the other way around, has anybody got any thoughts on this.

John
15 June 2010 at 09:49 #52669
Eric Cox
Participant
@ericcox50497
Another anomaly shows the pins on the track at 15.52mm but the text states 16.00mm.

Which is correct.
13 July 2010 at 19:25 #53363
John Stuart 1
Participant
@johnstuart1
If like me you have found great difficulty in tracking down the 22mm part cross over and almost given up as it’s made from 100% unobtainium and only bought in a pack of 10 to special order, I fell lucky today and found a local firm with 4 on the shelf at low cost so if like me you were having trouble I can share the information as to the whereabouts (north west) or even post you 1 if need be.

John
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