rivet or screw ???

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well on the duck hunting forum we are having a discussion on which is better to attach a floor to the ribs on a boat. ive always pre drilled then put in screws .others go by the notion thats screws exert outward pressure and can lead to cracking so they say use rivets saying they don't exert outward pressure. i say by the way a rivet works it does exert outward pressure and maybe more so then a screw i mean a rivet works by pulling itself through itself until it wedges tight enough to break off and hold tight am i wrong in this thinking  ive always thought of the rivet over screw because the vibration will cause screws to back out what say ye350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:The outward force on rivet is not inside the metal being connected. It's on the bottom of the rivet. Rivets are one of the strongets joining systems. They elimiate any gaps the fasiner would have had around it and will not back out. once the gap is filled the outward force stops. where as a screw cuts/pushes the materal around it to get it out of the path of the threads. This creats outward force.Take a thin piece of wood. Predrill it for a screw and a rivot and see what happens to the wood. The screw will slit the wood. the rivet will not.There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:Need to remove it at sometime?  Use a screw.Don't need to remove it except in a 'rebuild' type of scenario?  Use a rivet.A screw can back out.  A rivet really can't.Both are useful.  Use the 'right' fastener for the task.  The best laid schemes ... Gang oft agley ...
Reply:Rivet or Screw? Since this is welding web, I say plug weld it and eliminate the argument of outward pressure with this method, no cracking either, if it does, weld it up.
Reply:Originally Posted by umahunter... which is better to attach a floor to the ribs on a boat.
Reply:thats all well and good but what im after is does a rivet exert outward pressure i have drilled the tops off of plenty of rivets and had to drive them out  with a pin because there wedged in solid not just smashed against the back side ???350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:the outward pressure is minimal at most. The reason the rivet needs to be hammered out is because the hole that it's in wasn't a perfect cylindrical hole. It's got gouges and cupping. The rivet fills these defects when it is being set. This eliminates movement in the joint. Adding longevity to the joint. They've unearthed 1,000 yr old viking ships that was still being held together by the rivets. Rivets are also used in buildings and airplanes. They are used in very thin aluminum sheet metal on wings and fuselages. If the rivet produced outward force enough to damage the surrounding metal it would not be used for these purposes.There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:the boat factories use rivets  on all their aluminum boats. they are water tight & last for the life of the boat. that's good enough for me !
Reply:There are some applications for rivets that spec a washer be installed on the shaft of the rivet prior to expanding.  I assume this is to make the joint tighter without distorting the joined metal.  If the back side of the rivet can't be reached, it requires two people to do it.
Reply:Once the screw or rivet is set, it's going to stop exerting any "splitting" force on the hole, generally speaking, so neither one is better than the other in that department.In a boat where there's a lot of vibration, I would choose rivets over screws because screws would have more of a tendency to loosen. Also, since screws are going to be made of some material other than aluminum, the dissimilar metals in a wet environment are going to create potential (ha!) for galvanic corrosion, whereas an aluminum rivet in an aluminum rib won't have nearly as much potential for corrosion...even in freshwater (unless it's de-ionized).
Reply:dont mess with riveted boats, buy a welded boat for duck hunting  tackleexperts.comwww.necessityjigs.comhttps://www.facebook.com/groups/mach...dingequipment/
Reply:Originally Posted by brucerdont mess with riveted boats, buy a welded boat for duck hunting
Reply:Rivets a rivet regardless of the method used to attach it. The same forces apply either way.There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:dont mess with riveted boats, buy a welded boat for duck hunting
Reply:a blind rivet will exert little to radial force on the hole.I personally like a good huck rivet.Vantage 500's LN-25's, VI-400's, cobramatics, Miller migs, synch 350 LX, Powcon inverters, XMT's, 250 Ton Acurrpress 12' brake, 1/4" 10' Atlantic shear,Koikie plasma table W/ esab plasmas. marvel & hyd-mech saws, pirrana & metal muncher punches.
Reply:How thick are the ribs you are attaching the wood decking to?  Probably not over .093?  A screw would need more material than that for the thread engagement and not pull out eventually.Take a look at the link for large head rivets.  You can also drill your clearance hole in the wood a scootch bigger than the shank of the rivet to prevent any splitting you think you may encounter. Wood getting wet will swell and a larger clearance hole may help that.http://www.bryke.com/large_head_rivets.htmlVibration from the boat and motor is one thing but get a couple of hunters in all the gear standing on and moving around on that decking and that is another thing all together. That decking will be flexing and putting a lot of different forces on the fasteners.my 2 cents.
Reply:ah im not worried i have an all welded boat and my floors aluminum diamond i wouldn't use wood except for a last resort 350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:Gotch ya.  I was assuming wood decking, not metal, as a floor.  Like Bistineau suggested earlier.  Plug welds?I'm at a tough decision point. Keeping my decoys and goose shells or unloading them.   Haven't used them for many the past seasons.  I'd rather have to be making a decision like yours.Safe, good hunting!!!Fillethead