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Michaels Sonex #145 log
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Date: 8-30-2012
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Number of Hours: 1.20
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Manual Reference: F06
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Brief Description: Installing glareshield attach angles
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I completed installing the glareshield attach angles.
It seems I've discovered the trick for drilling the stainless steel.
After talking to my friend Bob about the troubles I was having drilling the stainless steel, he did some research for me and came up with a few suggestions.
Some helped, some didn't but I finally came up with a combination that seems to do the trick.
Anyway, here's what works for me:
Firstly, the drill needs to be set to slow, I knew that already, I just did not realize how slow, my battery powered drill set to the slowest setting is not nearly slow enough.
The problem is that as soon as stainless steel heats up a little, it becomes much harder and impossible to drill.
So I tried my big electric powered drill, apart from being capable of much higher speeds this drill is also capable of much slower speeds, only a couple of rev’s per second at the slowest speed, that’s perfect for this job!
Secondly, you need to use a cutting fluid to cool down the surface you’re drilling, yes I knew that as well, but it seems normal cutting fluid makes the job more difficult because it makes the surface slippery and the drill bit just can’t get a grip.
Use mineral turps! Really, it works much better, it keeps the drill bit and surface cool but the drill bit still can get a grip.
Stop every 5-10 seconds or so to apply a bit more turps (I use a small brush to do this).
Finally you need to put a lot of pressure, the bit needs to really cut into the steel and make a lot of progress in few revolutions, not just scrape some dust of the surface .
The hole won’t look as good but it’s only a pilot hole, after updrilling (which is easy), you’ll still have a perfect hole.
Doing all this, it takes about 20-30 seconds to drill a 3/32 hole through the stainless steel firewall.
(BTW the drill bits I use are cobalt but I guess that’s a given).
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