In words this is drill off the collar with a large sharp drill (larger drills need a slower drill speed to cut) and then punch out the centre of the rivet, taking care to not damage the hole. Hence the video represents what I now do for my Laser® spars. I always found that the rivets would start to spin if I did this, which would cause more damage to the hole I was trying to protect. The 0.2mm gap will be cause the rivet to fail almost before you have re tidied up your tool box! Also never drill out a rivet with a 4.8mm drill you will find that the rivet will wonder as the rivet is usually harder than the aluminium spar it is attached to.ĭave was keen to drill out the centre of the rivet first with a tiny drill and then use an over size drill to take the collar off it. Dave impressed on me the importance of the hole there should be little or no gap between the rivet and the boom for best engineering strength, so whatever you do, do not use a 5mm drill to drill out a 4.8mm (3/16") rivet. I think the expert I took advice from was an aircraft engineer from HMS Daedalus called Dave Chisholm. So drilling off rivets and replacing them has been a common occurrence for me sailing the Laser®/ILCA. Perhaps I was always time rich and cash poor, but I would always re build booms from broken top masts (making sure to use the part with the official sticker on it) I would end for end my top mast before it broke and I have even end for ended an old bottom mast before it broke due to corrosion at the vang tang position. I was amazed recently when I found a semi pro Laser®/ILCA sailor who did not know how to drill off rivets (sometimes called blind rivets) or use a rivet gun. Here you will find some top tips on how to drill off a blind rivet and more information on rivets hole diameters and rivet lengths: For more technical advise read on.
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