Bronze Eccentric Straps

Bronze Eccentric Straps

This topic has 6 replies, 4 voices, and was last updated 25 August 2015 at 23:41 by Bob Youldon.

Viewing 7 posts - 1 through 7 (of 7 total)

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25 August 2015 at 19:49 #201945
Malcolm Harvey
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@malcolmharvey97633
Is there any reason why I shouldn't make eccentric straps out of bronze plate instead of gunmetal castings? I have a decent sized piece of bronze plate of appropriate thickness that will unlikely ever be used for anything else. Unfortunately I cannot be more specific as to what type of bronze it is other than to state the obvious that it is less copper coloured than gunmetal but more copper coloured than brass! Loco is Titfield Thunderbolt in 3.5" gauge.
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25 August 2015 at 19:49 #1439
Malcolm Harvey
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@malcolmharvey97633
25 August 2015 at 20:11 #201952
JasonB
Moderator
@jasonb
I've done it in the past with bronze when making engines to my own design where castings are not available but mostly use a slice from a suitably sized bit of cast iron bar for eccentrics
25 August 2015 at 20:49 #201956
Malcolm Harvey
Participant
@malcolmharvey97633
Just had another look at them. They are actually turned from a piece of bar. I have two pieces about 5" diameter.
25 August 2015 at 23:06 #201976
julian atkins
Participant
@julianatkins58923
Bronze will be superior to gunmetal castings. Bulleid refered to eccentric straps as 'disc brakes'!

cheers,

julian
25 August 2015 at 23:11 #201978
Malcolm Harvey
Participant
@malcolmharvey97633
I think O V S Bullieid himself was a bit eccentric!!
25 August 2015 at 23:41 #201980
Bob Youldon
Participant
@bobyouldon45599
Ah, a Titbolt Thunderfield, a wonderful little locomotive.

A piece of bronze is always a better bet than a gunmetal casting which inevitably seem to stretch after a period of use, better still cast iron straps running on steel eccentrics. A good friend of mine always referred to eccentric straps as band brakes!

Regards,

Bob Youldon
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