[balsaman]

HuFlungDung,

The delrin nuts work great for wood routers. No backlash and stiff enough to cut wood.

For cutting steel, you are correct, there is some spring in the plastic.

I use home made delrin nuts on my router and can cut wood and aluminum no problem. There is much more flex in the wooden machine than in the nut.

I have access to pure teflon at work but it's 1/8" thick. One could compress some layers between two pieces of aluminum and tap it. Teflon is softer than delrin.

I don't think the friction is a big deal. I would stay with what ever you can find handy.

Eric