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You are correct on down/ horizontal thrust and I should have looked up the =
towers and bells handbook sooner. My memory!, getting old.
This error results in comparing 5T to 120T as against 2.5T to 120.
Incidentally the braking load of a 3/4 rod is likely to be over 6T in the s=
ort of drawn steel bar to be found in a tie rod. My 3T is would be a reason=
able working load, so that 40 rods, over tightned could achieve well over 1=
20T.
Frames usually have single 5/8" or 16mm, tie rods not 4 rods of 3/4" (19mm=
), although 3/4" is found.
regarding Kingposts perhaps you would like to look at the RW P 1030 picture=
again.
Near centre there is a bell with chalked on it=20
"12.1.??
Brasted."
Immediately to the right of the chalk writing a vertical oil stained post c=
an be seen, with an angle brace coming to it, not the frame head.
The baring for the bell is immediately above it.
The next bell on the left, the other side of the same pit, on the left of t=
he writing but before the image of the wheel can be seen a tie rod next to =
another vertical post, with an angled brace coming to it.
If you like to look at P34 of the towers and bells handbook you will see th=
is is like illustration III not IV, although the braces are straight, or ne=
arly so, which is much more normal than illustration III.
The many short head frames I have seen are not like Illustration II and can=
not be.
They are much higher and have spanning beams across the angled braces, esse=
ntial to stabilise the pit widths.
I have certainly seen crushed timber, with load spreader plates bent and dr=
awn into frame heads and headstocks, to say nothing of crushing under heads=
tock cross bars. No one regularly going into towers will not have seen this=
problem.=20
Admittedly not a show stopping issue unless there is also serious decay or=
infestation as well.
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You are correct on down/ horizontal thrust=
and I=20
should have looked up the towers and bells handbook sooner. My memory!, get=
ting=20
old.
This error results in comparing 5T to=
120T as=20
against 2.5T to 120.
Incidentally the braking load of a 3/4 rod=
is=20
likely to be over 6T in the sort of drawn steel bar to be found in a tie ro=
d. My=20
3T is would be a reasonable working load, so that 40 rods, o=
ver=20
tightned could achieve well over 120T.
Frames usually have single 5/8" or 16mm, t=
ie rods=20
not 4 rods of 3/4" (19mm), although 3/4"=20
is found.
regarding Kingposts=20
perhaps you would like to look at the RW P 1030 picture again.
Near centre there is a bell with chalked o=
n it=20
"12.1.??
Brasted."
Immediately to the right of the chalk writ=
ing a=20
vertical oil stained post can be seen, with an angle brace coming to it, no=
t the=20
frame head.
The baring for the bell is immediately abo=
ve=20
it.
The next bell on the left, the other side =
of the=20
same pit, on the left of the writing but before the image of the wheel can =
be=20
seen a tie rod next to another vertical post, with an angled brace coming t=
o=20
it.
If you like to look at P34 of the towers a=
nd bells=20
handbook you will see this is like illustration III not IV, although t=
he=20
braces are straight, or nearly so, which is much more normal than illustrat=
ion=20
III.
The many short head frames I have seen are=
not like=20
Illustration II and cannot be.
They are much higher and have spanning bea=
ms across=20
the angled braces, essential to stabilise the pit widths.
I have certainly seen crushed timber, with=
load=20
spreader plates bent and drawn into frame heads and headstocks, to say noth=
ing=20
of crushing under headstock cross bars. No one regularly going into to=
wers=20
will not have seen this problem.
Admittedly not a show stopping =
issue=20
unless there is also serious decay or infestation as=20
well.
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