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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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How to tighten gland nut earthing ring?
Is there any sensible way to tighten SWA gland earthing ring nuts?
Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. -- Chris Green · |
#2
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How to tighten gland nut earthing ring?
On 06/04/2021 20:05, Chris Green wrote:
Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Hammer and large flat screwdriver? -- Adam |
#3
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How to tighten gland nut earthing ring?
Chris Green wrote:
Is there any sensible way to tighten SWA gland earthing ring nuts? chuck it away an use a piranha earth nut? |
#4
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How to tighten gland nut earthing ring?
Andy Burns wrote:
Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? chuck it away an use a piranha earth nut? Yes, I guess that's one answer, but they are expensive, more than doubling the cost. E.g. Screwfix:- Tower Rubber Exterior Gland Kit 20S 2 Pack £2.99 Earthing Nut 2020 2 Pack £5.79 -- Chris Green · |
#5
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How to tighten gland nut earthing ring?
In article ,
Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. In my tool box is a spanner designed for doing up these nuts. No idea when or where I bought it. It's a seriously modified ring spanner. -- from KT24 in Surrey, England "I'd rather die of exhaustion than die of boredom" Thomas Carlyle |
#6
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How to tighten gland nut earthing ring?
Chris Green wrote:
Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I came across this video yesterday with a different technique using a pair of adjustable spanners - not sure if it answers the question as I've not worked with SWA: https://youtu.be/KJfbhnUKKUE?t=927 Theo |
#7
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How to tighten gland nut earthing ring?
charles wrote:
In article , Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. In my tool box is a spanner designed for doing up these nuts. No idea when or where I bought it. It's a seriously modified ring spanner. Yes, a ring spanner would probably do it, I'm not sure I have one that big but it's almost worth buying one specially. -- Chris Green · |
#8
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How to tighten gland nut earthing ring?
On 06/04/2021 20:25, ARW wrote:
On 06/04/2021 20:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin.Â* I don't have any box spanners this big anyway. Hammer and large flat screwdriver? Ah. The well known Geordie Shipwrights spanner :-) Would one of those semi-circular spanners used many moons ago to tighten the bottom bracket nuts on a bicycle do the trick ?. |
#9
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How to tighten gland nut earthing ring?
On 06/04/2021 20:54, Theo wrote:
Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I came across this video yesterday with a different technique using a pair of adjustable spanners - not sure if it answers the question as I've not worked with SWA: https://youtu.be/KJfbhnUKKUE?t=927 Theo "Water pump" pliers I believe. |
#10
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How to tighten gland nut earthing ring?
Andrew wrote:
ARW wrote: Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Hammer and large flat screwdriver? Would one of those semi-circular spanners used many moons ago to tighten the bottom bracket nuts on a bicycle do the trick ?. A bit expensive, but there's this which is for conduit bushes, but would it also suit gland nuts? https://thebushsocket.com |
#11
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How to tighten gland nut earthing ring?
Andrew wrote:
On 06/04/2021 20:25, ARW wrote: On 06/04/2021 20:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin.Â* I don't have any box spanners this big anyway. Hammer and large flat screwdriver? Ah. The well known Geordie Shipwrights spanner :-) Would one of those semi-circular spanners used many moons ago to tighten the bottom bracket nuts on a bicycle do the trick ?. OP here. I've searched around quite a lot about this and I'm horrified by the bodges that seem to be standard electrician's methods for doing this. The "Hammer and large flat screwdriver" approach seems quite popular and the other common approach is water pump pliers, preferably with smooth jaws so they don't mark the nuts! When you read all the quite specific, complex requirements of the wiring regulations you somehow think electricians aren't bodgers but they are! There are a few spanners around to specifically fit the back nuts but it's near impossible to find what size the nuts are so it's quite difficult to get a 'proper' spanner. I've measure the nuts I want to tighten, they're 25mm (why on earth aren't they the same size as the gland nuts themselves?) and I have a i" ring spanner which should fit OK eve if it's a bit loose. Hammers and screwdrivers!! Grips, pliers and adjustable spanners, ugh!!! (Mr Royce or was it Rolls supposedly sacked someone for using an adjustable spanner) -- Chris Green · |
#12
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How to tighten gland nut earthing ring?
On 07/04/2021 11:39, Chris Green wrote:
Andrew wrote: On 06/04/2021 20:25, ARW wrote: On 06/04/2021 20:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin.Â* I don't have any box spanners this big anyway. Hammer and large flat screwdriver? Ah. The well known Geordie Shipwrights spanner :-) Would one of those semi-circular spanners used many moons ago to tighten the bottom bracket nuts on a bicycle do the trick ?. OP here. I've searched around quite a lot about this and I'm horrified by the bodges that seem to be standard electrician's methods for doing this. The "Hammer and large flat screwdriver" approach seems quite popular and the other common approach is water pump pliers, preferably with smooth jaws so they don't mark the nuts! When you read all the quite specific, complex requirements of the wiring regulations you somehow think electricians aren't bodgers but they are! There are a few spanners around to specifically fit the back nuts but it's near impossible to find what size the nuts are so it's quite difficult to get a 'proper' spanner. I've measure the nuts I want to tighten, they're 25mm (why on earth aren't they the same size as the gland nuts themselves?) and I have a i" ring spanner which should fit OK eve if it's a bit loose. Hammers and screwdrivers!! Grips, pliers and adjustable spanners, ugh!!! (Mr Royce or was it Rolls supposedly sacked someone for using an adjustable spanner) As someone else (I think) said: you could cut a section out of a ring spanner. Alternatively, grind an undersize open-ended spanner to fit or cut yourself a bespoke spanner out of some gauge plate. |
#13
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How to tighten gland nut earthing ring?
On 06/04/2021 19:05, Chris Green wrote:
Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Sounds like something in the style of a plug spanner for single-cylinder Velocettes: https://www.groveclassicmotorcycles....-Handle---14mm The BSA plug spanner is similar. I'm sure the ones I had were shorter, but we're talking sixty years ago... -- Spike |
#14
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How to tighten gland nut earthing ring?
On 06/04/2021 20:05, Chris Green wrote:
Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. I have a small set of waterpump style pliers that can just about get onto the standard back nuts. Quite often I ditch the standard nut and use a Piranha nut instead since they are much easier to get a grip on, and also give you a handy earth tag fixing point without needing the banjo tag. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#15
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How to tighten gland nut earthing ring?
Andy Burns wrote:
Andrew wrote: ARW wrote: Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Hammer and large flat screwdriver? Would one of those semi-circular spanners used many moons ago to tighten the bottom bracket nuts on a bicycle do the trick ?. A bit expensive, but there's this which is for conduit bushes, but would it also suit gland nuts? https://thebushsocket.com As you say, quite expensive, and you can't use it with the cable in the gland which would be the normal situation if you've assembled it as describe in the DIY FAQ. -- Chris Green · |
#16
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How to tighten gland nut earthing ring?
On Wed, 7 Apr 2021 11:39:27 +0100, Chris Green wrote:
Hammers and screwdrivers!! Grips, pliers and adjustable spanners, ugh!!! (Mr Royce or was it Rolls supposedly sacked someone for using an adjustable spanner) "Knipex Adjustable Wrench Pliers" (8605150) got to 27mm, and the jaws are smooth...? Very nice, but expensive. Thomas Prufer |
#17
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How to tighten gland nut earthing ring?
Andrew wrote:
On 06/04/2021 20:54, Theo wrote: I came across this video yesterday with a different technique using a pair of adjustable spanners - not sure if it answers the question as I've not worked with SWA: https://youtu.be/KJfbhnUKKUE?t=927 "Water pump" pliers I believe. No, the video is saying that the Bahco thin adjustable spanners are better than the water pump pliers technique. I couldn't comment. Theo |
#18
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How to tighten gland nut earthing ring?
Thomas Prufer wrote:
On Wed, 7 Apr 2021 11:39:27 +0100, Chris Green wrote: Hammers and screwdrivers!! Grips, pliers and adjustable spanners, ugh!!! (Mr Royce or was it Rolls supposedly sacked someone for using an adjustable spanner) "Knipex Adjustable Wrench Pliers" (8605150) got to 27mm, and the jaws are smooth...? Very nice, but expensive. I just don't see how these help really, they're no easier to get into the right place (more difficult in fact) than an ordinary spanner of the correct size are they? Whatever you do you'll slip sometimes and graunch the nut a bit, smooth jaws or not. The only thing they seem to provide is a way of holding large nuts where you don't have the right size spanner. I have open ended spanners in 1mm steps up to over 30mm and many other sorts up to 24 or 25mm so I see little need for adjustable grips. Am I missing something? -- Chris Green · |
#19
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How to tighten gland nut earthing ring?
Spike wrote:
On 06/04/2021 19:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Sounds like something in the style of a plug spanner for single-cylinder Velocettes: https://www.groveclassicmotorcycles....-Handle---14mm The BSA plug spanner is similar. I'm sure the ones I had were shorter, but we're talking sixty years ago... Yes, exactly! That's almost the perfect tool for the job at installation time when the cable isn't connected. Probably quite cheap too, box spanners don't have to be made of particularly hard material. -- Chris Green · |
#20
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How to tighten gland nut earthing ring?
John Rumm wrote:
On 06/04/2021 20:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. I have a small set of waterpump style pliers that can just about get onto the standard back nuts. Quite often I ditch the standard nut and use a Piranha nut instead since they are much easier to get a grip on, and also give you a handy earth tag fixing point without needing the banjo tag. Yes, as I said above I really don't understand why the standard nuts are so thin and bigger that all the other nuts on the glands. -- Chris Green · |
#21
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How to tighten gland nut earthing ring?
On 06/04/2021 20:05, Chris Green wrote:
Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. You can get a mole-type wrench with long pointy jaws that will do it. Several on Google, or check Amazon for BGS 474 |
#22
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How to tighten gland nut earthing ring?
On 07/04/2021 11:39, Chris Green wrote:
Andrew wrote: On 06/04/2021 20:25, ARW wrote: On 06/04/2021 20:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. You can't tighten from the outside because that would twist the wire - or is the correct technique to tighten the gland in the box before tightening the cone nut (if so the DIYFAQ needs to be changed or added to to indicate this is how to do it)? I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin.Â* I don't have any box spanners this big anyway. Hammer and large flat screwdriver? Ah. The well known Geordie Shipwrights spanner :-) Would one of those semi-circular spanners used many moons ago to tighten the bottom bracket nuts on a bicycle do the trick ?. OP here. I've searched around quite a lot about this and I'm horrified by the bodges that seem to be standard electrician's methods for doing this. The "Hammer and large flat screwdriver" approach seems quite popular and the other common approach is water pump pliers, preferably with smooth jaws so they don't mark the nuts! When you read all the quite specific, complex requirements of the wiring regulations you somehow think electricians aren't bodgers but they are! There are a few spanners around to specifically fit the back nuts but it's near impossible to find what size the nuts are so it's quite difficult to get a 'proper' spanner. I've measure the nuts I want to tighten, they're 25mm (why on earth aren't they the same size as the gland nuts themselves?) and I have a i" ring spanner which should fit OK eve if it's a bit loose. Hammers and screwdrivers!! Grips, pliers and adjustable spanners, ugh!!! (Mr Royce or was it Rolls supposedly sacked someone for using an adjustable spanner) So why not reverse engineer it:-;? Why not make off the SWA, fit it to the gland and then remove it from the gland. Then fit the cone section and the earthing nut with ease and then remake the SWA termination onto to the gland. If you are doing it properly just after you have "finished" you realise that the boot is on the wrong way around etc. -- Adam |
#23
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How to tighten gland nut earthing ring?
On 07/04/2021 17:51, Chris Green wrote:
Spike wrote: On 06/04/2021 19:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Sounds like something in the style of a plug spanner for single-cylinder Velocettes: https://www.groveclassicmotorcycles....-Handle---14mm The BSA plug spanner is similar. I'm sure the ones I had were shorter, but we're talking sixty years ago... Yes, exactly! That's almost the perfect tool for the job at installation time when the cable isn't connected. Probably quite cheap too, box spanners don't have to be made of particularly hard material. Having had a number of single-cylinder Velocettes, I now recall the plug spanner came in different forms. Most were a short box spanner with loose tommy-bar as shown in the link. but one I had was based on a very short box spanner, shortened to just above the flats, with a short tommy-bar welded or brazed onto one side of the spanner. Doing this made it quite short in height, and turned upside down it looked like a pipe for smoking tobacco. Box spanners are cheap and cheerful, and if anyone wanted to DIY a tool for tightening the SWA gland nut, this could be a way to go. -- Spike |
#24
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How to tighten gland nut earthing ring?
On 09/04/2021 09:10, Spike wrote:
On 07/04/2021 17:51, Chris Green wrote: Spike wrote: On 06/04/2021 19:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Sounds like something in the style of a plug spanner for single-cylinder Velocettes: https://www.groveclassicmotorcycles....-Handle---14mm The BSA plug spanner is similar. I'm sure the ones I had were shorter, but we're talking sixty years ago... Yes, exactly! That's almost the perfect tool for the job at installation time when the cable isn't connected. Probably quite cheap too, box spanners don't have to be made of particularly hard material. Having had a number of single-cylinder Velocettes, I now recall the plug spanner came in different forms. Most were a short box spanner with loose tommy-bar as shown in the link. but one I had was based on a very short box spanner, shortened to just above the flats, with a short tommy-bar welded or brazed onto one side of the spanner. Doing this made it quite short in height, and turned upside down it looked like a pipe for smoking tobacco. Box spanners are cheap and cheerful, and if anyone wanted to DIY a tool for tightening the SWA gland nut, this could be a way to go. Although if the cable is in place, you have to be able to thread the box spanner onto it, past the tommy bar, so that you can get it anywhere near the nut. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#25
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How to tighten gland nut earthing ring?
John Rumm wrote:
On 09/04/2021 09:10, Spike wrote: On 07/04/2021 17:51, Chris Green wrote: Spike wrote: On 06/04/2021 19:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Sounds like something in the style of a plug spanner for single-cylinder Velocettes: https://www.groveclassicmotorcycles....-Handle---14mm The BSA plug spanner is similar. I'm sure the ones I had were shorter, but we're talking sixty years ago... Yes, exactly! That's almost the perfect tool for the job at installation time when the cable isn't connected. Probably quite cheap too, box spanners don't have to be made of particularly hard material. Having had a number of single-cylinder Velocettes, I now recall the plug spanner came in different forms. Most were a short box spanner with loose tommy-bar as shown in the link. but one I had was based on a very short box spanner, shortened to just above the flats, with a short tommy-bar welded or brazed onto one side of the spanner. Doing this made it quite short in height, and turned upside down it looked like a pipe for smoking tobacco. Box spanners are cheap and cheerful, and if anyone wanted to DIY a tool for tightening the SWA gland nut, this could be a way to go. Although if the cable is in place, you have to be able to thread the box spanner onto it, past the tommy bar, so that you can get it anywhere near the nut. But it's doable with a box spanner, unless the cable is actually connected, as you can thread the cable through the box and past the tommy bar. A short piece of box spanner with a handle welded on (rather than going right through) seems to be the ideal solution to me, why electricians toolboxes don't have such a thing as 'standard' I can't understand. Socket and ring spanners are not so good because they tend to have a chamfer at the working face so, given that the SWA ring nut is so thin, they don't hold well. A box spanner generally doesn't have such a chamfer. A set of such things (box spanner with welded on tommy bar) for, say, 25mm to 35mm in 1mm steps would be ideal and should be very cheap as well. Maybe I'll go into business! :-) -- Chris Green · |
#26
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How to tighten gland nut earthing ring?
On 09/04/2021 11:14, Chris Green wrote:
John Rumm wrote: On 09/04/2021 09:10, Spike wrote: On 07/04/2021 17:51, Chris Green wrote: Spike wrote: On 06/04/2021 19:05, Chris Green wrote: Is there any sensible way to tighten SWA gland earthing ring nuts? Even on the smallest size (20mm hole) the gland nut is 24mm or 25mm and I've never managed to find a spanner of that size that has any chance of getting at the nut. I guess a short stub of a box spanner with a tommy bar welded on might do the job but I doubt if you can get a socket onto the nut, it's too thin. I don't have any box spanners this big anyway. Sounds like something in the style of a plug spanner for single-cylinder Velocettes: https://www.groveclassicmotorcycles....-Handle---14mm The BSA plug spanner is similar. I'm sure the ones I had were shorter, but we're talking sixty years ago... Yes, exactly! That's almost the perfect tool for the job at installation time when the cable isn't connected. Probably quite cheap too, box spanners don't have to be made of particularly hard material. Having had a number of single-cylinder Velocettes, I now recall the plug spanner came in different forms. Most were a short box spanner with loose tommy-bar as shown in the link. but one I had was based on a very short box spanner, shortened to just above the flats, with a short tommy-bar welded or brazed onto one side of the spanner. Doing this made it quite short in height, and turned upside down it looked like a pipe for smoking tobacco. Box spanners are cheap and cheerful, and if anyone wanted to DIY a tool for tightening the SWA gland nut, this could be a way to go. Although if the cable is in place, you have to be able to thread the box spanner onto it, past the tommy bar, so that you can get it anywhere near the nut. But it's doable with a box spanner, unless the cable is actually connected, as you can thread the cable through the box and past the tommy bar. A short piece of box spanner with a handle welded on (rather than going right through) seems to be the ideal solution to me, why electricians toolboxes don't have such a thing as 'standard' I can't understand. Socket and ring spanners are not so good because they tend to have a chamfer at the working face so, given that the SWA ring nut is so thin, they don't hold well. A box spanner generally doesn't have such a chamfer. A set of such things (box spanner with welded on tommy bar) for, say, 25mm to 35mm in 1mm steps would be ideal and should be very cheap as well. Maybe I'll go into business! :-) I suspect the answer is that its not considered enough of a problem to make a special tool worthwhile. (much as I like "the right tool for the job", I am also conscious that my electrical tool box is 'kin heavy already!) (it may also be there is enough variation in the locknut sizes as to make one tool a non starter anyway in much the same way as there will be times you always need an adjustable of some sort for some plumbing jobs). I tend to find in many cases you simply need to stop the inner nut spinning, and then you can tighten from the outside - before fitting the SWA to the gland permanently (i.e. not inserted at all, or inserted but the the armour grip nit not fully tightened). In those cases just jamming something (e.g. screwdriver between end of case and nut or between two adjacent nuts) against the inside nut is enough to start tightening against it from outside, and then it tends to hold in place anyway once its got a bit of grip. On the rare occasions I use banjo nut rather than a piranha, I find my small (6" or so) grips work well enough since they have one slim jaw, and can grip well and parallel onto the opposing flats of the nut. They also grip when pointing perpendicular at the nut, and that gives some clearance over any cable coming through the gland). It also helps that when the banjo tag is in place, that spaces the slim nut away from the enclosure a bit making it easier to grip. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
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