Brit Progress: Motion Bracket Castings

[Deleted]

As nobody else appeared to be able to supply motion brackets I got these from Reeves. Here is the RH one, perfect in every way. Machining did not take long.

Here is the abortion of a LH bracket from the same supplier. It was in two parts, and looked as if it had been cast with a trowel! The lugs for the expansion links were not formed as in the RH bracket, and I had to spend three days getting the thing somewhere near acceptable before I could braze it up!

Bracket now brazed up and part machined.

Brackets being offered up to make sure I got it somewhere near right. Still a lot of fettling needed.
By the way, when I was setting up the guide bars on the frames I was pulling my hair out trying to get the slippers to run as freely as they did when I trialled them on the surface plate. I did not realise that the frames were not perfectly parallel at the guide bar brackets, throwing them out. If you look closely you can see the slip gauges bring the frame gap back to the required dimension......


At least the Brit is starting to look like a locomotive: quite exciting really!

[welshy]

Looking good JB. As for bad casting this can be quite a problem with many of them, it is sometimes easier and quicker to start from scratch and fabricate the components.
I was going to buy the GM casting for the chimney of my Stirling a couple of weeks ago but decided to make it from solid, as the casting would have cost £100 with postage and would have been a pig to machine. I spent a few hours on and off at work and produced a chimney
(and 2 full carrier bags of swarf) that I was more than happy with.
I will try to get a photo in images of the finished article if you or anyone is interested.
Mike

[Deleted]

Yes please Mike! My next project, if I live that long that is, wil be a 'Cornwall', with a large chimney......
JB

[redmog]

Or not 'Brit, Progress' in this case but 2-6-2, V4 slow progress.
Hi JB - thanks for the PM.
I'm not on the nuts at the moment, I need to get a thin slitting saw and a warmer workshop.
Working on the eccentric rods at the moment, 66mm between centres - sorry - 2" + something to you imperial men.
I want to insert a 10mm O.D. dia. bearing so here's progress so far -

Chris

[Deleted]

Hi Chris. Did you get those laser cut?
JB

[redmog]

No JB.
Rotary table and a lot of care.
Taken me a couple of weeks but it's the sense of achievement that counts and there's still work to do with thinning and fluting them.


Chris

Well Done drjohn that's your sense of achievement for the week.
Black Five next week!

[simonwass]

Feb 9, 2009 10:56:29 GMT redmog said:

Or not 'Brit, Progress' in this case but 2-6-2, V4 slow progress.
I'm not on the nuts at the moment, I need to get a thin slitting saw and a warmer workshop.
Working on the eccentric rods at the moment, 66mm between centres - sorry - 2" + something to you imperial men.
I want to insert a 10mm dia, roller bearing so here's progress so far -
Chris

I bet its not a self aligning bearing
Only kidding, nice to see one modelled and very nice machining work.

[Deleted]

Wow!

[redmog]

Feb 9, 2009 16:21:47 GMT simplyloco said:

Wow!

My Mistake JB
They're not roller but ball bearing

Chris

Sorry JB- I keep hi-jacking your thread. Perhaps I should start my own
called 'Gresley V4 Slow Progress'