I use a Weaver-style oval head scope base screw cut to size as necessary so that the oval head completely bottoms out in the
countersink. Anneal the screw prior to installation.
The FE results can also be used to estimate the
countersink shape for a given punch load.
They all drove easily with no stripping or breakage and sat perfectly flush without the need for a
countersink bit.
Countersink 1 1/4-inch deck screws along these lines, 3/4 inch in from each edge of each board.
Drill and
countersink two side runners ready to screw into the flat supports.
To
countersink the lag heads, use the 3/4" spade bit drilled 1/4" deep.
Drilling a pilot hole for the screw and then creating a recess, or
countersink, for the screw head is standard practice on cabinets and furniture projects.
FBM will detect solid machining features for the chosen FBM operation type, based on selection criteria; machine pockets using 2D roughing, rest mill, and finish operations; automatically support closed, open, nested, and through-pockets and set-the-right-toolpath options; optionally create a separate finish toolpath for floors and walls; identify when external machining is required and enable users to activate or deactivate it; identify when facing is required; create drilled, tapped, counterbore, and
countersink holes; perform deep drilling, spot drilling, pre-drilling, tool selection, and tool creation if needed; provide advanced controls to drill blind, through, co-axial, and split holes; and select the appropriate tools for all operations.
When painting new exterior construction where non-galvanised nails have been used, it is advisable to first
countersink the nail heads, then seal them with a top quality, water-based all-acrylic or siliconised acrylic sealant.
Rhodri Clark: Bit part:Of all the attachments invented to fit on a drill, the best has to be the
countersink bit because it's such an easy way to make your work look satisfyingly competent.
If the nails are rusty, replace them with screws and also replace any damaged boards - make sure that any boards which are on fillets on the side of joists are glued and screwed and
countersink the screws.
I say "nearly" because I have had to tuck a few extra items into it, like a bit extender, a set of pilot
countersink bits and some Vix bits, so I end up with a 97-piece set instead of a 90-piece set: I'd say Ryobi pretty much hit it on the head when putting this set together.
Now available anywhere in the world, SMART-BIT was specifically designed by Starborn Industries to create the perfect
countersink hole after hole.
