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Old 20 April 2006, 16:49   #1
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What sort of drill bit to get through stainless stell

I'm trying to mount an antenna on the A-Frame. I need to drill a 26mm hole through about 3mm (at a guess) of stainless steel. What sort of drill bit should I buy? I have ruined a couple of bits trying already!

Thanks chaps
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Old 20 April 2006, 17:05   #2
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Ordinary HSS drill bit. Use slow speed otherwise you'll blunten it straightaway. About 5 rpm is fast enough.
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Old 20 April 2006, 17:08   #3
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Hey, 26mm is a big hole! Drill a pilot hole first, then work up to the larger size.
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Old 20 April 2006, 17:10   #4
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OK thanks.. will just have to persevere with it.

Oh, it's 16mm!

Thanks for the hasty reply
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Old 20 April 2006, 19:12   #5
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Buy a stepped drill, lotsa different sizes on the one drill, or a cone cut which is a tapered drill and excellent for sheet material. As Richard says, run it slowly and keep it well lubricated, as in flooded with lubricant.


You still sleeping nights Richard?
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Old 20 April 2006, 19:19   #6
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If you do follow the "go up through the sizes" option rather than JW's cone cutter, then I would recommend looking at some of the titanium coated drills (Bosch do a reasonable range). They tend to last a good bit longer than standard HSS and I've found they leave a much cleaner hole with less burrs to remove

Andrew
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Old 21 April 2006, 07:39   #7
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5 RPM Richard??
Thats one turn every 12 seconds? Sounds a bit slow to me?
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Old 21 April 2006, 08:07   #8
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You're right!

I was thinking 5 turns per second... 300rpm!

What's sleep?
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Old 21 April 2006, 08:12   #9
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Originally Posted by Richard B
You're right!

I was thinking 5 turns per second... 300rpm!
You were closer first time. At 16mm dia 60ish would be nearer the mark.

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Old 21 April 2006, 09:24   #10
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If it's flat and you can get to the other side, you could do what I did and get a hole cutter from Maplin. You drill a small hole through the metal, fit the hole cutter either side and then tighten up with an allen key, and it slowly cuts out the disc of metal.
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