Dimensional errors in LBSC Doris drawings

[RicardoParticipant @ricardo]

Hi

I am about to start construction of LBSC Doris.

Would be grateful to know if anyone has a list of dimensional errors on the drawings.

Thanks

Richard

[RicardoParticipant @ricardo]

[WearyParticipant @weary]

Suggest that you try looking on this site:

**LINK**

(You may have to join to use the site, but it is free, etc.)

Some of the members have this locomotive, and at least one, username runner42 is currently building. I know that he has found an error in the regulator block.

There is also an interesting series of posts on bringing the boiler up to date – with particular reference to meeting the current 'Aussie boiler regs'. (The site is run and administered by an Australian, and has a strong representation from that area.)

Regards,

Phil

[stan pearson 1Participant @stanpearson1]

Hi Richard

I have built and still have a 31/2" Doris, I don't remember any real issues with the drawings but I have always used drawings as a guide only and check things before I cut. I don't remember problems with the regulator but it was a long while ago when I made it.

Stan

[J HancockParticipant @jhancock95746]

I'm not sure if the law about burning witches ( heresy ) has been withdrawn so criticism of errors, or design flaws , has to be avoided.

However, I would suggest you carefully go through the dimensions of the drawing relating to clashing of the rotating parts with stationary objects over the full movement ( up and down ) of the axleboxe and complete 360deg rotation of parts.. Connecting rods fouling slide bars or the bottom end of the expansion link . Coupling rods hitting weighshafts , or crossheads !

Valve spindles not lining up with centre of expansion link , also eccentric rod connections well out of line with ' reality '.

On the drawing these will all ' look good', only a careful check placing the drawing dimensions onto squared paper will reveal the 'truth'.

Reading the write up of the day , end to end ,is useful and will include some errors , but not all !

Even if you find no errors , the time will have been well spent.

[Author]

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