[Rich05]

I need to make a fairly dense spiral 10 revolutions. with about .25" between walls. can someone suggest a way to do this? thanks.
R.

[Cmailco]

Sure, make a very expensive mandrel. Which might be a bit price prohibitive depending on the quantity you actually need?

That or source it out: http://www.falconindustries.com/conveyor_screws.htm

Regards

[NEATman]

You don't mention the cross section of the material, but if it is not too stiff, and you have a heavy duty lathe, (with a very slow speed) you could wind it like winding a custom spring. You can wrap it around a threaded mandrel at your desired pitch, or wind it with a "spacer" like this:
http://chestofbooks.com/home-improve...il-Spring.html

Keith

[Rich05]

thanks for advise i think i found a bendable plastic alternative.