Hi Mike
I guess it would depend if the jacket was fitted separately after the cylinder was installed
If so the bolts would probably be nearer the cylinder as for an unjacketed cylinder with the jacket going over the top of them
That would restrict tightening the bolts of course!!ise on I’m afraid
David
Nt an area I have any expert
> On 22 May 2017, at 08:00, margaret and michael shaw <[log in to unmask]> wrote:
>
> perhaps my question was not phrased tightly enough, the answers I was
> hoping for would have informed me of or pointed me to a source which dealt
> with cylinder overall 'wall' thickness for different types of engine at
> different dates, obviously a jacketed cylinder would be of a lesser working
> diameter for a given bolt spacing.
> Mike Shaw
>
> On 20 May 2017 at 13:45, David Hardwick <[log in to unmask]>
> wrote:
>
>> Surely the key dimension is the diagonal one - simple Pythag theorem for
>> that!
>>
>> From bolt to bolt across the diagonal you should have
>>
>> Bolt, Nut, gap (for spanner), thickness of cylinder wall, internal
>> diameter of cylinder, thickness of cylinder wall, gap (for spanner), Nut,
>> Bolt
>>
>> The diameter of the holding down bolts will vary as will the nut and the
>> thickness of the cylinder but I would be interested to know whether there
>> is any trend or similarity regarding these
>>
>> (e.g. 1” dia holding down bolts were common in…. )
>>
>> Has anyone done or know of research on the sizes of holding down bolts etc
>>
>>
>> David
>>
>>
>>> On 17 May 2017, at 20:43, margaret and michael shaw <[log in to unmask]>
>> wrote:
>>>
>>> Gents thanks for the ideas.
>>> Mike Shaw
>>>
>>> On 16 May 2017 at 23:25, Rod Goslin <[log in to unmask]> wrote:
>>>
>>>> Assuming four bolts,and that the bottom of the cylinder is flanged. 1.1
>>>> Metres bolt to bolt, the pitch circle would be 1.1*root 2. Running that
>>>> to inches comes to 61.26 inches. Assuming a steam jacket and spanner
>>>> clearances, it should be reasonably easy to assess the size of the
>>>> cylinder. I've no idea as to the usual design of cylinder bases, so
>>>> I'll leave the guesswork to you.
>>>>
>>>>
>>>> On
>>>> Tue, 16 May 2017 20:46:25 +0100 margaret and michael shaw
>>>> <[log in to unmask]> wrote:
>>>>
>>>>> I have been involved with a ruined pumping engine house which retains
>>>>> its cylinder bed and wonder whether it is possible to know diameter
>>>>> of the cylinder from the spacing of the bolts. The building does not
>>>>> predate the early 1780s and was certainly out of use by the 1860s,
>>>>> possibly earlier. The bed and loading are probably not from the first
>>>>> engine housed and there is a pit between the bed and the bob wall
>>>>> which suggests that the last occupant was a Boulton and Watt or
>>>>> similar engine. The bolts are at 1.1m centres.
>>>>> The cylinder bed has been cut approximately in half and rejoined with
>>>>> wrought iron clamps/dogs set in lead, why would this have been done?
>>>>> Mike Shaw
>>>>>
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