On Fri, 19 Sep 2014 22:22:07 -0400, rickman wrote:

On 9/19/2014 7:41 AM, Clifford Heath wrote:
On 19/09/14 17:21, rickman wrote:
On 9/19/2014 1:58 AM, Clifford Heath wrote:
On 19/09/14 14:45, rickman wrote:
On 9/18/2014 5:51 PM, Jim Thompson wrote:
I have some blank wall outlet cover plates, claiming to be "nylon".
I don't get it. 3/4 inch should be a flat bit.

That won't work in thin plastic, especially if it's soft. Once it breaks
through at one point, it basically tears the rest apart.

That's called using finesse. That is why I suggested that it be drilled
from both sides. The flat part of the blade will never touch the
material. The edge blades will cut through the outer circle before that
happens. I've ended up with a small disk in my hand nearly every time
I've drilled through plywood with one of these.

Yes, you can get away with that sometimes. Not often on curved thin
sheets though, like the front of a wall plate often is.

I don't know what wall plates you have, but mine are not curved other
than right at the edges. Flat as a board. I'm tempted to dig one up
even if I have to pull it off a wall and give it a try. Not likely to
be nylon though. I'm not sure what they make the real cheapies out of,
but I don't think it is nylon as they are rather brittle and nylon isn't
brittle, at least in its early life.

The normal wall plate isn't nylon but nylon plates are sold as
"unbreakable".