Caladh
Well-Known Member
That's what I used and it was fine. Must bash the rivets down on something like an anvil or similar.
Advice sought re Installing a Crosby C- link.
- Thread starter fredrussell
- Start date
That's what I used and it was fine. Must bash the rivets down on something like an anvil or similar.
RichardS
N/A
Sorry, I was supposing that people could swing a hammer.Having had a lifetime of metal bashing, I forget that many are maybe not so competent in that way.
Ah yes but ..... I've had a lifetime of engineering rather than metal bashing so approach the issue knowing that Momentum = Mass x Velocity.
Richard
RobbieW
Well-Known Member
Ah yes but ..... I've had a lifetime of engineering rather than metal bashing so approach the issue knowing that Momentum = Mass x Velocity.
Richard
Sounds like the Birmingham approach to engineering; if precision doesnt work, get a bigger hammer
RichardS
N/A
Sounds like the Birmingham approach to engineering; if precision doesnt work, get a bigger hammer
LOL ..... I'm from Sheffield and we call that the Manchester approach.
There's a thousand years of history in some of these colloquial sayings. :encouragement:
Richard
Pete7
Well-Known Member
Sounds like the Birmingham approach to engineering; if precision doesnt work, get a bigger hammer
In this particular case that is exactly what is needed, oh and a new marina pontoon cleat which now looks the worse for wear as I used it as the anvil.
RobbieW
Well-Known Member
I used the shank of a Danforth style anchor that sailaboutvic was trying to flog at the time. Worked very well as the anvil and came away unscathed
fredrussell
Well-Known Member
Well, put it on tonight. No dramas - used a 4mm wide centre punch that I had filed flat the tip for the purpose. Stuck adjoining links in vice as per Vic's suggestion above and used a 2lb lump hammer. A very reassuring amount of effort was required to do the work - shall sleep well when next at anchor.
Spirit (of Glenans)
Well-Known Member
Presumably the reasoning behind CCJ's concave nail punch.
RichardS
N/A
Presumably so .... but I'm not sure whether a concave punch would encourage the rivet to spread out like a mushroom or whether it would do the opposite. I've no idea.
Richard
Daverw
Well-Known Member
I just used a pin punch which are flat anyway, no need to form it with any type of punch
NormanS
Well-Known Member
Bear in mind that the riveting is only to keep the two halves of the link in place, and has little to do with the strength of the link.
vyv_cox
Well-Known Member
Presumably so .... but I'm not sure whether a concave punch would encourage the rivet to spread out like a mushroom or whether it would do the opposite. I've no idea.
Richard
In school metalwork classes well over half a century ago I made a brass matchbox holder. Close to useless as a household object but it was riveted using copper rivets. I remember using a pair of concave punches top and bottom to form pleasing rivet heads and tails. Maybe they still exist but possibly not man enough for H&T steel?
Dull Spark
Well-Known Member
Cold riveting of steel of any size is tricky. Any reason not to heat it up a bit?
vyv_cox
Well-Known Member
Definitely not to be heated. The Crosby version is hardened and tempered and heating it would reduce the strength by a factor of 4 - 5.
Pagetslady
Well-Known Member
slight change of direction, is there any way of recognizing a Crosby C -Link some time ago I bought two from somebody on this forum who ordered a lot of them, but I dont know if they are Crosby C -Link.
Mike
Mike
lukedh
Well-Known Member
A rivet set and snap like these that I used too:
https://www.rdgtools.co.uk/acatalog/3-16--rivet-snap-489.html
Attachments
Neeves
Well-Known Member
This is a bit complex,
Take a 5mm high tensile bolt. Drill the end, the threaded end, drill only to a depth of about 1-2mm. using a 3mm drill bit. Chamfer the end, grinding wheel, until the slight dimple drilled end becomes the point - use as a rivet punch. edit - my post and the previous one crossed - you are trying to make something 'like' the device in the image close edit. You need something as the anvil underneath. You will need a hefty hammer (again as mentioned)
Personally it is unnecessary to aim for perfection - you only need to secure to hold the 'C' link together. The riveting - as mentioned is not load bearing.
Take a note of where the 'C' link is located in the rode - and check regularly - maybe mark with cable ties.
Jonathan
Take a 5mm high tensile bolt. Drill the end, the threaded end, drill only to a depth of about 1-2mm. using a 3mm drill bit. Chamfer the end, grinding wheel, until the slight dimple drilled end becomes the point - use as a rivet punch. edit - my post and the previous one crossed - you are trying to make something 'like' the device in the image close edit. You need something as the anvil underneath. You will need a hefty hammer (again as mentioned)
Personally it is unnecessary to aim for perfection - you only need to secure to hold the 'C' link together. The riveting - as mentioned is not load bearing.
Take a note of where the 'C' link is located in the rode - and check regularly - maybe mark with cable ties.
Jonathan
Last edited:
vyv_cox
Well-Known Member
Was the seller Skipper Stu? They were Crosby. It is easy to tell them when you make them up. Chandlery ones are soft and the rivets are easily made up with a light hammer. A Crosby takes heavy hammering to deform the rivets.
Skylark
Well-Known Member
That’s so funny ?. Did you do it in Croatia? If so, no doubt the local police would have issued you with a fine in the amount equivalent to rebuilding the entire marina ?
Ah yes but ..... I've had a lifetime of engineering rather than metal bashing so approach the issue knowing that Momentum = Mass x Velocity.
Richard
This one seems somewhat contradictory to the earlier one. You jest, me thinks ?
RichardS
N/A
Yes .... the pontoon in Kremik Marina with some pieces of paving slab I found in the bushes by the car park.
The slabs were a fail. I should have remembered that although Momentum = Mass x Velocity, when one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body. :ambivalence:
Richard