Threaded Insert For Wood,Garage Table Plans,Create-a-bed Murphy Bed Mechanism Manual - Review

On some engines, the exhaust port can make inserting the hold-down screws and their washers a nightmare dance and jiggle, especially if the fuselage sides are tall and restrictive. Regardless whether you use engine mounting plates, or mount the engine direct to the wooden bearers, the important thing for long-life and freedom from an engine which comes loose under vibration is to prevent compression of the engine bearer wood.
Even when both sides of the bearer are open, such as on a profile model, conventional screws and nuts will compress the wood, which is not a good idea. Captive screws poking out of the bearers went out with the ark and are another bad idea as they too require compression of the wood.
Start by drilling all the way through using the minimum clearance size for the screws that will be used. We will use a nut driver on the nut to seat the insert, but before doing this, smear a little bee's wax, or paraffin wax, or even some bar soap, or thread grease on the insert thread to ease and lubricate its passage into the wood. The last step for a real "pro" job is to plug the back side of the bearer by forcing a piece of square balsa into the round hole (thoroughly disproving the old one about square pegs and round holes). He was right of course, but I've come to the conclusion the often, there is more than one "right" way, and the best way is to select a right way that works for you. We want some form of "blind nut" inside the bearers that we can easily tighten our mounting screws into. This hole should be drilled only just deep enough to fully submerge the insert, so place a piece of masking tape on your #16 drill bit as a depth stop, using the insert to position it.

When the nut bottoms on the bearer wood, the top of the insert must be planar with the face of the bearer.
The plugged hole will prevent any oil which finds its way into the insert hole from easily emerging and soaking into whatever is on that side of the engine bearer—generally a balsa top block which will sponge up the oil all too easily and weaken your front-end. This page shows the way I've finally decided is the right way to secure model engines to wooden engine bearers. The idea is to increase the area of the engine lug to decrease the chance of crushing the wood. Some have a continuous external thread on the outside, while others have channels in the thread, much like those on a tap. It's important that the hole be perpendicular to the bearer, so if possible, use a drill press for all drilling operations. It's a REALLY good idea to lightly counter sink the hole you've just drilled for the insert as it will tend to raise the edge of the hole when being screwed home. The part extending below the insert will be a close fit in the through-hole we drilled and will perfectly align the insert for insertion. The extra cautious folk will place a machine washer between insert and nut as extra insurance against screwing too far into the bearer.
This will wick in, hardening the balsa and probably wick further up around the insert as extra insurance.

Naturally you are going to trim the screws so they don't extend any appreciable distance past the bottom of the threaded insert when all the rest of the paraphernalia is present, or all this good work will be for 'naught. Threaded inserts, provided you install them from the side that the engine mounts on, don't have this problem because you tighten the screw and engine lug (or plate) onto the top of the insert itself—the wood just holds the insert. A light countersink to about the major diameter of the insert thread will prevent the bearer wood chipping, or being raised around the hole.
As the bearer wood is not and cannot be compressed, the engine is far less likely to come loose under vibration and the bearers will last forever—or until the first serious prang, whichever comes first. As the inserts make poor taps, compression will take place and the chance of the wood splitting is high. The inserts are brass and the insertion torque is generally more than the metal around the slot can stand, so they distort, or break off before the insert is fully down.

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