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Center punching the cup arms. |
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We're going to put a fairly big hole in stainless here so we MUST start with a
small pilot drill, and you HAVE to use oil. Put another drop on once or twice as you
drill. |
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First the pilot hole ... |
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Then the full size hole. |
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Then a large over-sized drill to deburr the back of the hole. |
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And now we're ready to bolt them to the cap. |
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We want the four arms equally spaced around the cap, which can be tough to lay
out unless you use this trick ... Wrap a piece of paper around the cap so that the
ends of the paper overlap. Draw a short line across both pieces of paper. |
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Lay the paper back out and extend lines from the two marks you just made. |
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Use a ruler to find the midpoint between the two lines, and draw a third line |
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Now find the midpoint in each of those spaces, and draw two more lines.. |
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You should end up with 5 equally spaced lines. |
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Wrap the paper back around the cap. The lines on the ends should line up. Mark
the cap at each line. Your marks are now perfectly spaced. |
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Measure up from the rim at each mark, and center punch for the drill. |
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Now drill out ONE hole for each arm. Do NOT drill the second holes. |
