Body
NormanI've never seen white oak used, but I sure have seen lignamvite, used, end grain against the prop shaft, and in big water turbines too.A couple of months ago, I bought the forge and machine shop equipment from an old stone water mill that developers are turning into something awful. In among the equipment, I got several blocks of lignamvite that the millright used to make new bearings. The tools are all antiques, but made locally in Canada in the 1800's
I used lignamvite on my schooner for all sorts of things. It grows in the Carribean. Cheers Warren
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On Wed, 10 Apr 2019 at 12:41 PM, Norman Wootan [email protected] [EVGRAY]<[email protected]> wrote:
To add to that is the fact that very large propeller shafts on big steam powered vessels used white oak blocks lubricated with heavy grease in the stuffing boxes.. Of course these huge propellers only turned a few hundred RPM but had great thrust.?? Interesting facts.
On 4/9/2019 5:56 PM, [email protected] [EVGRAY] wrote:
??
Surprisingly enough many, including Parsons and Brown Boveri, used Babbitt bearings with a high pressure oil film.
Ron
---In [email protected], <nwootan@...> wrote :
Use your head man.?? High speed steam turbines were being built at the same time using high speed roller and ball bearings that lasted many years. very reliable.
On 4/9/2019 4:17 PM, Mick mkjekyll@... [EVGRAY] wrote:
??
Thank you Norm,
Great information as always!
Just wondered what Dr Tesla may have used for bearings back then before off the shelf silicon nitride and such.?? Something spinning that fast would eat up bearings if they were not choice.?? Perhaps they were ball as you allude rather than hydrodynamic fluid bearings.
I shall order your presentation.
On 4/9/2019 1:31 PM, Norman Wootan nwootan@... [EVGRAY] wrote:
??
https://en.m.wikipedia.org/wiki/Tesla_turbine
On 4/9/2019 3:28 PM, Norman Wootan wrote:
https://www.teslatech.info/ttstore/conftapes/teslatech/2016jul/ETC16Web.pdf
The basic principle behind the Tesla Turbine is the De Laval Nozzle for it converts the maximum amount of potential energy, Pressure/ Heat into Kinetic Energy with proper design and application. If you don't understand this principle, best you leave the turbine off your to-do list.
I explained all this in my 2016 Presentation at the Tesla Conference. You have to make your condensable vapor/gas transition to supersonic before impinging upon the runner disk pack and then go subsonic creating a shock wave that drives the boundary layer on the disk surface so you get the maximum bang for your buck.?? 99% of all experimenters do not understand this.?? The driving media must be a condensable vapor so that you have a partial vaccum,?? on the cool side and up to around 120 PSI driving pressure on the hot side. See
https://en.m.wikipedia.org/wiki/Ball_bearing https://web.stanford.edu/~hydrobay/lookat/tt.html
https://www.scribd.com/doc/82705538/Tesla-Turbine-Technicals
https://auto.howstuffworks.com/tesla-turbine4.htm
On 4/9/2019 12:29 AM, Mick mkjekyll@... [EVGRAY] wrote:
??
Norm,
Your work on the Tesla Turbine, where can I find the DVD again, I would
like to buy one?
What did Tesla use for a bearing back then that could handle the RPM?
I know you said he had Nozzles made by a company back then but bearings
come into question.
Thanks,
Mick
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