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Self-Drilling Screws

The Do It Yourself Flight Simulator projects are built from plastic
PVC pipe.  

You can use self-drilling screws as one option to secure the pipes
in the connectors.  These are also known as self-tapping screws.

This type of screw includes a tip that is shaped much like a drill
bit.  They are designed to drill through sheet metal, and they work
really well with PVC pipe also.

Drill the screws through the edges of the connectors and into the
PVC pipe within.  The pipe is held tightly in place.

The screws might be designated as a 8-18 or 10-16.

The first number refers to the size of the head.  See here the size
10 is thicker than size 8.

The second number is the number of threads per inch.  16 or 18
threads per inch.

For our purposes, it doesn't really matter which size or thread
count you use.  Either will do.  

In many of the DIYflightsims projects, we specifically recommend
screws that are 3/4" long.  This unique angle shows we have
drilled the screw through the connector and into the pipe.  The
pipe is held in place.

The common theory was that 1/2" screws were too short.  But look
at this one.  The drill bit part of the screw is sticking out and the
threaded part of the screw is long enough to hold the pipe in
place.  Well that means the 1/2" screw should work fine.

The advantage is that you can buy 75 1/2" screws for about the
same price as 50 3/4" screws.

It's easy to drill the screws into the PVC connectors, but a little
technique will help.  Remember that the tip of the screw will work
like a drill bit, so use a high RPM setting on your drill.

You'll want to drill close enough to the edge of the connector to
catch the pipe.  How far does the pipe extend into the connector?  
I'll make a mark here and show you.  

Ok, with this in mind, make a dot for your drill.

Start very slowly when you drill, to prevent the screw from
"walking" across the smooth surface.  Once the screw starts
drilling into the plastic, drill at full speed.

If you don't start slow, the screw, walks across the surface.  (black
& white)
(show again slow-mo)

Be careful not to drill in the screw too much.  You don't want to
round out the hole and give the threads nothing to hold on to.

If the Phillips head screws are not available, the hex head screws
will work just as well.

You will need a socket adapter for your drill and a 5/16" socket.  

Drill them in just like you would the Phillips head screws:  slow and
then fast.

After a coat of paint, the screws give your flight simulator a neat
machined look.  They help your home cockpit look more like a
vehicle and less like plumbing.