TRANSFERRING HOLES USING MASKING TAPE

You'll need some masking tape and a pen, pencil, or fine-point marker. Make little tabs out of the masking tape to mark and trans- fer the holes. The length of ...
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H   ANDS ON HINTS FOR HOMEBUILDERS

TRANSFERRING HOLES USING MASKING TAPE BY JOE NORRIS

BUILDERS ARE SOMETIMES FACED with a situation where there are holes in an underlying structure that must be transferred to a component that covers the holes. This is common where a cowling meets the fuselage or an inspection cover must be fabricated and mounted over a recessed flange. How do you get the holes in the right place so that the parts line up? Here’s an easy, inexpensive way. You’ll need some masking tape and a pen, pencil, or fine-point marker. Make little tabs out of the masking tape to mark and transfer the holes. The length of your masking tape tabs will vary depending on the location of the holes, but the process will be the same. Start with a piece of masking tape that’s about three times as long as the distance from the edge of the panel to the hole you need to transfer. Fold one third of the tape over against itself so that the sticky part is covered up. You’ll end up with a little tab that is half

sticky on one side. Make enough of these tabs for all the holes you need to transfer. Stick the tab to the structure adjacent to the hole you want to transfer so that the folded section covers the hole. Then, press the tab down against the hole and mark the center of the hole with your marker. After you have tabs marked for all the holes you are transferring, bend the tabs out of the way and place the component you are transferring the holes to in its proper location. Next fold the tabs back over this component and use a center punch to transfer the holes. But, there’s a trick to this! Be sure to adjust for the thickness of the material

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98 Sport Aviation July 2010

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you’re working with. If the panel you’re mounting is a flush fit, the structure with the holes in it is recessed by the thickness of the structure surrounding the opening. If the panel you’re mounting overlaps the surrounding structure, you’ll have to adjust the location of the hole to correct for this thickness. If the panel is flush-mount, adjust the hole closer to the edge of the mounted panel than what is marked on your tape tab. If the panel you’re mounting overlaps, adjust your hole slightly toward the center of the panel being

mounted as compared to the mark on your tab. The amount of adjustment will be roughly equal to the thickness of the material you’re working with, depending on how tightly you pressed the masking tape tab against the jog in joint. And that’s a quick, easy, and inexpensive way to transfer holes.

TRANSFERING PROCESS

ILLUSTRATIONS BY PIERRE KOTZE

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