Quote:
Originally Posted by pelican
this is correct - to a point,,,
first - if you're drilling thru something - you need the ability to hold that product in the hole - otherwise,gravity does it's thing...
wood:
when you you have access to the underside:
small hole saw - example,you want to use 1/4-20's - use a 1" hole saw.go through it,use a piece of painters tape - the good blue tape,tape underneath - fill the hole with a thickened expoxy - I like and use west system,with 403 adhesive additive...
once the epoxy kicks - locate where the fastener goes,drill a 3/16" hole - drop a shot of 3m 5200 over the hole and run that 1/4-20 in with a screw gun....it will thread the epoxy as it goes in - no need to "tap" anything !.the 3m 5200 will make it waterproof and keep the fastener tight...need to remove it ? use a screw gun - it'll back out
working with no access from underneath:
determine the thickness - slip a small section of tubing over a drill - setting the depth...
don't drill through the panel...drill the hole and fill the area with the thickened epoxy...
if the wood core is rotted - you're wasting your time !NONE of this will work !
composites - use a sharpened allen wrench - grind the short end into somewhat of a blade - slide this in the hole and remove some of the composite coring...fill with the thickened epoxy...use the same procedure I described above,concerning drilling and running holes...
ocean yacht used this technique for years
this technique is required for using fasteners in composites,when thru bolting/sleeving isn't possible...
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Going to drill a couple of 3/4 " holes this weekend to check condition of wood core. The deck is original guessing it's balsa wood. The console flang sits over the big box stringers, I don't think I want to drill through them. Does anyone know if there is fiberglass under the core or is it just on top. Thank you for the advice on using machine screws.