At least you're honestOriginally Posted by DCL_dave
still happy to have a crack though, even if it usually means whittling a barrel down shorter and shorter and shorter...
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At least you're honeststill happy to have a crack though, even if it usually means whittling a barrel down shorter and shorter and shorter...
Custom BSA S10 .22 PAX Phoenix Mk 2 .22 Custom Titan Manitou .22 (JB BP) HW77 .22 FWB Sport Mk1 .22 Sharp Ace .22 Crossman 600 .22 Berretta 92 .20 Desert Eagle .177
I Like Gingers Best
To thine own self be true...At least you're honest
On a side note, in the first response to this thread, Rich quite rightly mentions that if a big enough lathe is used then the breech block can just be fed inside the bore straight through the headstock. Whilst this is true, I guess it is worth mentioning that, to carry a HW breech block for instance, you would need a bore of at least 48mm through the headstock and it would still need to be held tightly in a custom made bush of some type to support the barrel along its length...my old Herbert lathe has a bore of 42mm, so that sucks!
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Banned
Couldn’t you just use a lathe with a short headstock so you only have the barrel in it and the block is free?
Is that bore radius or diameter Dave, how big is the block?
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Hi Rob,
Yes I guess you could use a lathe with a very short headstock (know you of such a beast?) ...but you would still need to support the unequal mass of a HW breechblock that would be sticking out the back of the headstock (I think this is what a lathe spider would be used for?) otherwise, as it is spinning, the centrifugal force would try to throw the breechblock out/away from the centreline of the lathe spindle with disastrous results.
A HW80 breechblock is roughly 35mm x 18mm in cross sectional area, with an approximate bias of 24mm towards the bottom edge of the block (the bit that houses the barrel plunger and the cocking link) so to keep the barrel turning true to the centre of rotation along it's entire length, you would need a lathe with a spindle bore diameter of at least 48mm to accommodate the breechblock inside the lathe spindle.
I hope that doesn't sound too much like gobbledygook?...but I suspect it does...
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Banned
No that all makes sense. I just saw some short headstock lathes on a gun smithing page on Facebook so wondered.Hi Rob,
Yes I guess you could use a lathe with a very short headstock (know you of such a beast?) ...but you would still need to support the unequal mass of a HW breechblock that would be sticking out the back of the headstock (I think this is what a lathe spider would be used for?) otherwise, as it is spinning, the centrifugal force would try to throw the breechblock out/away from the centreline of the lathe spindle with disastrous results.
A HW80 breechblock is roughly 35mm x 18mm in cross sectional area, with an approximate bias of 24mm towards the bottom edge of the block (the bit that houses the barrel plunger and the cocking link) so to keep the barrel turning true to the centre of rotation along it's entire length, you would need a lathe with a spindle bore diameter of at least 48mm to accommodate the breechblock inside the lathe spindle.
I hope that doesn't sound too much like gobbledygook?...but I suspect it does...
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I suspect such a lathe would be a very specialised and expensive bit of kit?
I don't do facebook, but if it can be viewed without having to log in?...any chance of a link, please?
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Banned
I'll see if i can find them. The problem with Facebook is stuff gets buried and lost and is pretty hard to search. It's not really concerned with longevity.
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Dave
Google Grizzly gunsmith lathe
It's only a short headstock lathe with a built in spider at the back .
I haven't been stuck for much on a normal lathe . I just have to pretend I'm a proper engineer and use the noggin.
Like you said , all that breech block flapping around unsupported and off centre prob ain't good .
Last edited by hmangphilly; 18-03-2019 at 09:28 AM. Reason: very pompous
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