Thompson Class B1 Springbok

[springbok]

Here is it running forward the noise is a poxy compressor I bought at auction.

www.youtube.com/watch?v=xzHyvxVwzc0&list=HL1323780978&feature=mh_lolz
The rolling road was made by my youngest grandson aged 17. He wanted to do it as a project. so if it is going so nicely in forward why clunk in reverse. Have never had this problem on a Loco before. Bago thank you for diagrams.
Oh it was one of my grandsons who posted the video I would have no idea how to do it..

Chris quotes
It was interesting to look at Martin Evans' drawings for the valve gear because he never showed what the full gear valve travel was. I suspect he did not know it!!

Also when he was describing setting the valves in the ME series, he explained that the little spy holes should be opened and the amount of lead set by adjusting the valve on its rod. This clearly is wrong as the only thing you can do by moving the valve on its rod is to centralise it, or offset it one way or the other.
Chris I think you are spot on and will also wait for the article.

Regards to all
Bob

[Smifffy]

Great Video Bob, thanks for sharing.

Smifffy

[brozier]

Hi Bob,

Just a thought - when you were running on air did you wedge the driving wheel axle boxes so they were at the correct (running) height?

I didn't do this when I tested my Simplex chassis - it ran okay but better in reverse!

Cheers
Bryan

[baggo]

Hi Bob,

It certainly seems to run fine in forward gear

I would suspect that the 'clunk' in reverse gear is possibly a clearance problem. Can you feel a tight spot if you turn the wheels by hand? You might find that at the 'clunk spot', the lifting arms kick as something hits something else.

I think what Martin meant about adjusting the lead was, as you say, centralising the valve and getting the port opening the same at each end of the cylinder when in mid gear. The lead is set by the dimensions of the valve gear and can only be altered by changing the dimensions of the combination lever. Doing the calculations gives a lead of 0.03125" which I would consider excessive but Don Young used to favour large amounts of lead.

One test I do to check the setting of the valve is to run the loco as slowly as possible until it will only just run. Try and do this with just one side at a time on air. If the valve setting is not quite right, the wheels will stop just before either front or back dead centre whilst passing over the other. That indicates that the port is opening slightly too early on the end that sticks. I then tweek the valve until it will get over both dead centres and still run slowly. A few thou can make a lot of difference!

John

PS as Bryan has just said, to get accurate results you really need to pack the axleboxes up so that they are in the correct running position. You may have done that anyway.

[springbok]

Bryan
have done as you suggested but to no avail.
Baggo
Thank you will look into that.

Bob

[kenn]

Hi All I am looking for contact details of a Michael Breeze (UK) who have build 5" an 7 1/4 B1 who may be able to give good info of the B1 Sprinbok

[springbok]

Hi Ken
Are you the same person I have been talking to on a different forum and this who is trying to do 3D drawings and sorry have not heard of a M Breeze could you be more specific.

Bob

[peterseager]

Blackgates have Michael Breeze's 7 1/4 G B1, Stembok, in their catalogue. I remember a news item in one of the magazines saying he had sold most of his designs to Blackgates.

Peter

[spamcanman]

Michael Breeze was at Harrogate show a couple of years back selling his drawings he's still around.

[springbok]

Hi Pete and Spam
Thankyou for clearing that up

Thankyou
Bob

[davebreeze]

Michael Breeze was selling his plans at the show at Karlsruhe in Germany last Friday. I made a point of speaking to him for obvious reasons, although we're not related! He was there last year too, I wonder how much business he does there, although he does have a German loco in his list, a class 01 pacific.

I saw 2 LNER B1s on the running track at Karlsruhe, one from the UK I think but the other flying a Swedish flag from the smokebox.

[springbok]

Hi Dave
Did you take any pic's
Bob

[davebreeze]

Bob,

I took a few pics but the B1 only appears in one poor quality video clip I tried. I was mainly taking pictures of stuff you don't usually see at home, so I have plenty of photos of big German 2-10-0's and Swiss electrics etc but didn't really bother with the British locos ( as well as the B1s I saw a Manor, Black 5, GWR prairie tank, class 47 diesel). 6km of 5" gauge indoor running track so plenty of action! The pics I took aren't really up to much anyway as my now ageing digital camera doesn't cope well with the distances and light levels in the running track hall.

[kenn]

Hi I am the same person doing the B1 in 3D cad. It would be nice if we could find out how much the Martin |Evans and Michael drawings differ

[springbok]

Hi Kenn
Nice to speak to you on this forum. I believe at one point sent you pics of the bogie assembly. Confess as per my posting that I had never heard of Mr Breeze but do not think I would like to go the cost of purchasing a set just to do a comparison, on saying that if some kind member of this forum could loan me a set for a short time I could do this would pay all P&P etc. and return promptly.
Bob

[kenn]

Hi Bob

I did go and look at the Blackgate website to look at the price of a set of there drawings but they do not have the B1 listed. If there is any body out there with a set of M Breeze drawing please let us know. I am also looking for somebody who machined the main cylinder out of solid material and not a casting

Kenn

[springbok]

Hi Ken
Nigel Field from Canada kindly sent me this list of errors

Bob

Attachments:

[springbok]

Hi Page 2

Attachments:

[silverfox]

Kenn,

M breeze lives at Northborough. north of Peterborough

Ron (the other one)
building his B17

[kenn]

Thanks for all the feedback. If any body does come up with a e-mail address for M Breeze please forward to me Thanks