Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, March 12, 2005 1:40 PM
Subject: Re: [Homebrew_PCBs] titanium grades


>
> On Sat, 12 Mar 2005 13:00:28 -0000, Leon Heller
> <leon.heller@...> wrote:
>
>>
>> It'll dissolve the Al content, I would think. The Vanadium should be OK.
>> Leon
>
>
> So no good?
> I don't think missing 6% of the shaft would be acceptable (as the shaft
> should stay smooth for good bearing action).
>
> Do you guys think it will be ok to have a 6 to 10mm titanium shaft (I'll
> polish it) running in teflon at that rpm?
> Higher tube diameter means same pressure with lower RPM, right? I'd have
> some sewage tubes (50 or 60mm) which i could use.
> Matching the motor is not a problem (might use a pulley and belt if i find
> something suitable to have the motor in a box at the side or direct
> drive/straight with hose as coupler).
>
> I haven't worked with titanium or teflon before so i will see.. wonder if
> teflon can be drilled with standard tools...
> What bending strength has titanium? aluminum-like?

Titanium is ∗very∗ stiff, more like steel than Al. It's difficult to
machine. Why not use a plastic shaft, something like Delrin should be OK?


Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller