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Old 24 August 2010, 13:48   #1
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How to make hole in stainless bigger

I need to make this hole bigger by about 3mm to allow me to fit a new radar reflector. Any suggestions on how to do this?
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Old 24 August 2010, 13:58   #2
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A step drill is about the only option that I can come up with off the top of my head.

http://www.lawson-his.co.uk/scripts/...20Drill%20Bits
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Old 24 August 2010, 14:12   #3
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Arh. Wow. I've never seen one of those before. The only slightly issue is a: this is going to be one expensive hole and b: there is another stainless plate just under the one I want to drill (you can see in the photo) - I'm guessing if I use a step drill the bottom plate will get in the way.

Another option: some sort of grinding Dremel attachment
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Old 24 August 2010, 14:24   #4
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You should get away with using a cheap/cheerful bit if it's just one hole. If you've got a grinder just lob the end off the bit.

Or as you say, dremel it, but you'll probably be there for a while and it'll have little resemblance to a round hole by the time you're done
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Old 24 August 2010, 14:35   #5
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clamp a piece of wood or bit of steell over it and follow through with std starret cutter, wood assists in the centering of arbor if that makes sence

http://uk.shopping.com/starrett-cutter/products
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Old 24 August 2010, 14:41   #6
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Tim, you could have a S/S unit made to fit the existing holes and then the top section with the correct holes for new unit. I have some images of how I achieved this, saves all the drilling and it just adds a small box frame above the holes in pic
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Old 24 August 2010, 14:55   #7
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A cone cutter.
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Old 24 August 2010, 15:34   #8
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Originally Posted by C2 RIBS View Post
Tim, you could have a S/S unit made to fit the existing holes and then the top section with the correct holes for new unit. I have some images of how I achieved this, saves all the drilling and it just adds a small box frame above the holes in pic
Hi Ian. That sounds even more expensive than the hole cutter!

I'm not bothered if the hole isn't very round - it will be totally covered by two nice big washers
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Old 24 August 2010, 15:35   #9
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clamp a piece of wood or bit of steell over it and follow through with std starret cutter, wood assists in the centering of arbor if that makes sence

http://uk.shopping.com/starrett-cutter/products
I can't see that cutting through this
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Old 24 August 2010, 15:45   #10
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Tim,

What is the thickness of the material? In total.

What size is the hole at present?

Up 3mm on the diameter?
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