Classic cars forum & vehicle restoration.
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BigJohn
Joined: 01 Jan 2011
Posts: 954
Location: Wem, Shropshire
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 Posted: Sat Jan 18, 2020 3:58 pm Post subject: |
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In my dim and distant past (I'd be about 9 or 10) I seem to remember my dear old Dad working on an old American marine engine with a set of stubby hammer spanners, each with a number cast in, and a big copper hammer. The number on the spanner indicated the number of blows required to tighten that size of bolt/nut up.
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1974 Mk1 Escort. |
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Ray White
Joined: 02 Dec 2014
Posts: 6310
Location: Derby
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| Posted: Sat Jan 18, 2020 4:41 pm Post subject: |
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| BigJohn wrote: | | In my dim and distant past (I'd be about 9 or 10) I seem to remember my dear old Dad working on an old American marine engine with a set of stubby hammer spanners, each with a number cast in, and a big copper hammer. The number on the spanner indicated the number of blows required to tighten that size of bolt/nut up. |
That is an education, John.!
I have seen those stubby spanners and not realised what the number meant.
The problem I see is that one of your blows would likely equal two of mine! |
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Penman
Joined: 23 Nov 2007
Posts: 4756
Location: Swindon, Wilts.
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| Posted: Sat Jan 18, 2020 6:46 pm Post subject: |
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Hi
accordijng to Wiki's Wrench page;
| Quote: | | This is a specialized thick, short, stocky wrench with a block end to the handle specifically designed for use with a hammer, enabling one to impart great force. Used commonly with large fasteners, especially a nut and stud which both have index marks: the nut is screwed hand-tight, then further tightened with the striking wrench a known number of index marks calculated from the elasticity of the bolt or stud, thus giving precise torque (preload). Striking wrenches also provide shock and high force used to release large and/or stuck nuts and bolts; and when space does not allow room for a large wrench. |
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Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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