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Model Forum / General / Models / February 2010Spares for Qualters & Smith power hacksaw
Hi folks, My Qualters & Smith power hacksaw has stripped a thread in the vice. It's the larger, less common Qualters & Smith machine, sold as their heavy duty hacksaw. 8 inch capacity with serial number HDS 8 2505. It may share parts with the smaller saws, but I'm not sure. It's not the main thread which closes the vice which is damaged, but one which accepts a pivot pin and allows the movable jaw to rotate. I can think of a few awkward and unpleasant ways of fixing this, but nothing straightforward, so I'm looking for spares. I've already tried Birkett Cutmaster, who bought Qualters & Smith in the 1980s. They don't have anything, so I'm guessing I'm looking at used spares. Does anyone know of a machine tool dealer who keeps used spares? Or anyone at all who has Qualters & Smith spares? Any suggestions would be much appreciated. Best wishes, Chris >Any suggestions would be much appreciated. If there's enough metal, bore it out and Loctite in a threaded bush. Cost is time and a bit of scrap. If not, invest in some Helicoils or a clone kit.. Might cost you £55 inc VAT and delivery for a 1/2" BSW kit from J&L Mark Rand RTFM > If there's enough metal, bore it out and Loctite in a threaded bush. Cost is > time and a bit of scrap. I thought about this. Not sure if Loctite alone would be strong enough as it carries a heavy load. There's just about enough metal, but I don't have a mill with which to bore the hole. Just a bench drill, which is too small. Instead I wondered about making a new male-threaded component with a longer thread, to engage with the remaining female thread at the bottom of the hole (I suspect the reason for the failure is that the male-threaded component is unoriginal and too short). So that's a possibility, but I don't have the necessary die and stock, and it's some way from being a good solution. > If not, invest in some Helicoils or a clone kit.. Might cost you £55 inc VAT > and delivery for a 1/2" BSW kit from J&L The size required is 5/8" BSF. The only kit I could find was an Armstrong Armacoil kit at more than twice the price you quote. Cheekily, it doesn't even include the drill. But it wouldn't fit in my bench drill's 1/2" chuck anyway. Best wishes, Chris >> If there's enough metal, bore it out and Loctite in a threaded bush. Cost is >> time and a bit of scrap. > >I thought about this. Not sure if Loctite alone would be strong enough >as it carries a heavy load. I think you might be surprised how strong a well-executed loctite joint can be, especially at this kind of diameter. > There's just about enough metal, but I don't have a mill with which to >bore the hole. Just a bench drill, which is too small. Instead I [quoted text clipped - 4 lines] >don't have the necessary die and stock, and it's some way from being a >good solution. Cheap enough - though cutting a 5/8" BSW by hand with a die is no joke. Do you have a screwcutting lathe? If not, do you have a friend who has? >> If not, invest in some Helicoils or a clone kit.. Might cost you £55 inc VAT >> and delivery for a 1/2" BSW kit from J&L [quoted text clipped - 7 lines] > >Chris You can easily get a blacksmith's drill (anything up to 1", with a 1/2" shank). Whether your drill has the grunt to drive it is another question. David  SignatureDavid Littlewood Sorry for the late response. > I think you might be surprised how strong a well-executed loctite joint > can be, especially at this kind of diameter. Maybe. But I'm reluctant. I want to be certain it'll be strong enough and won't degrade in the future. > Cheap enough - though cutting a 5/8" BSW by hand with a die is no joke. > Do you have a screwcutting lathe? If not, do you have a friend who has? I think I've found someone with the part I need, so hopefully I won't need to modify the clamping block. But it looks like the pivot posts are unoriginal. It's possible the thread failed because the male thread is shorter than intended, so I may still be making the pivot posts. I can imagine that cutting a 5/8" thread with a die is hard work. I can't think what I'd grip 5/8" round stock in to stop it rotating. And then there's getting the die started square. I often use the drill press (unpowered) for this with smaller dies, but it won't work with 5/8". What's the best way of doing it? My father has a Myford Super 7, which I think could be used for screw cutting. But I don't think he's ever used it for this purpose, so there probably isn't a 55 degree thread cutting tool with it. And the previous owner modified the wiring so that both "Forward" and "Reverse" on the control lever do the same thing. > You can easily get a blacksmith's drill (anything up to 1", with a 1/2" > shank). Whether your drill has the grunt to drive it is another question. I looked into this. Considerably more expensive than buying an ordinary twist drill of that size, and I'm doubtful that my drill press could drive it in cast iron. It copes with a 16 mm blacksmith's drill in aluminium, just about, but cast iron would probably be pushing my luck. Thanks for the thoughts. Best wishes, Chris |
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