(Note: This How To is respectfully dedicated to the memory of Ken Mosezar, an ACME member, friend and mentor.)
This approach uses a pin inserted in one part that fits in a related hole in a second part. This holds the two pieces together in alignment and allows you to mock up parts and modules of your project. It also creates a stronger joint. You can often use the pin to hold small parts for painting.
I usually use .032 brass rod for the pinning process:
I select a drill bit that is very slightly larger than the brass rod and drill the first piece. I usually create a starter hole with the sharp end of my Exacto knife: (Safety note: Make sure you really focus on this; the knife blade can slip off the piece and cut you.)
I super glue the pin in place using a length of brass rod that is much longer than I need. This makes handling the pin fairly easy.
When it sets up, I trim it to size. I remove any burrs and round off the end with a small file.
Next, I select the place for the hole in the second part. I am often able to press the two parts together, leaving a slight mark in the second one. Otherwise, I mark the second hole with a very fine point water soluble pen. I drill the second hole and test the fit with the pin. If all is well, I continue onward. If the hole is out of alignment for some reason, I usually fill it with super glue and an accelerator and re-drill the part.
Here are some pictures of the pinning I did on a recent 1921 Oldsmobile (Beverly Hillbillies) hot rod build.
Here, I used two pins for the engine and transmission:
These are the corresponding holes in the motor mount and transmission mount:
Here you see the pins I used for the radiator and for the location of the radiator hoses on the radiator:
These are the pins on the engine for locating the carburetor and also for the other end of the radiator hoses. There are also pins for the water pump pulley and the ignition coil:
This view shows the pins I used for the windshield. I decided to do that because I wanted a good alignment and stronger joint.
This is another view of the front of the engine, showing the radiator hose pins and for the water pump pulley.
Edited by Steve_L, 24 July 2012 - 12:31 PM.