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imranz

11:36AM | 10/31/05
Member Since: 10/30/05
1 lifetime posts
Bvwindows
I was trying to install a door viewer on the front door. While I was trying to drill the 1/8" pilot hole to make way for the 9/16" spade bit (as per the peep hole installation instructions), the 1/8" drill bit broke and I could see that the door seems to have a metal cover.

Could somebody suggest how I can drill the 9/16" hole to install this peep hole at the front door. I am using the bits with a 14.4 volt cordless drill.

Help would be greatly appreciated.

Thanks

bravey

03:00PM | 10/31/05
Member Since: 06/23/04
161 lifetime posts
First be sure to remove all pieces of the broken bit. You cannot drill another hole until it is removed. Even a small piece will cause great trouble in getting a clean final hole.

Peep viewers have very little lip and can't cover a messy hole in the face of the door. Drilling through a metal clad door can be a problem. Do not use spade bits, they are for wood. With thin metal cladding, even large twist bits (like the 9/16) tend to grab and chew their way through. For the final hole it would be best for you to use a 9/16 inch hole saw (can be hard to find in this size). The hole saw will have a pilot bit in the center. Drill your first hole the same size as the pilot bit. It is very important to keep the drill square to the face of the door. Use a framing square as a guide or have someone else watch from the side. After drilling the pilot hole completely through the door, drill the final hole using the hole saw but only drill half way into the door from each side. Do not drill full through the door from one side.

The hole saw will make a cleaner cut in metal. Do not use excessive pressure. Purchase bi-metal hole saw bits that are advertised for use on metal.

Regards
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