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Hello Patricia, The engine will be a type of tesla rotor (where the discpak rotates) plain and simple its just that (I just have some thoughts about how to implement various types of bearings that I just can go into, or someone will steal the design) thats why I wanted to know the which was the...

Ok this is what I calculated. 3.14 x 28(mm) x 2500000 -------------------- = surface speed in m/s (3663.33.....m/s) 1000 x 60 Just dont know how should plug in the values, should I calculate how much a mm2 of the material weighs and take that x the surface speed ^2 (similar to calculating...

New Postjistre (Mechanical) 20 May 08 16:08 That being said, how are you planning to spin the rotor up? I'm curious. ---- It a tesla/boudary layer disc turbine (I dont have access to 5 axis machines so this is waht I can do), the rotor spins by pushing air in beween discs, the action is...

Can someone helt me with calculation at what rpm a 14/28mm diameter rotor (grade5 Ti 6a4v) would rip apart from centrifugal forces? (I'm not an engineer I'm just simple machinist/programmer) All help would be greatly apprecieated.

cbrn - for running speeds up to 2.5 Mrpm (??? are you sure a micro-gas-turbine can run so fast??? I've heard of speeds about 500000 rpm, but not more...), then I really don't know. I suppose you'd have to go to no-contact bearing, oil- or gas-suspended (air-bearings ?)...

"electricpete" I hope you have thought through the safety aspects for yourself and others nearby. ---------------------------------------------- No man I'll just rev it up in the school yard and se what happens.. no seriously I have thick titanium sheets that will sorround this engine...

If its 3.1 mm thru and its reving 400k you probably have seriuosly good bearings in those engravers, do you know the brand of the bearings? OR if they are off the shelf products at all? sounds like good stuff. Anyway I have found a way to break MITs 2.5rpm record, I just cant tell you about it...

unclesyd how big is the shaft diameter going thru the bearing in your engravers? I know dentist drills rev about 850000 but they only have a 1mm shaft. (too weak for this turbine) I found a formula or rather rule of thumb on the web, it says 850000/shaft diameter in mm for an "optimal" ball...

OK The rotor will be about 28-25mm dia if its made to power something, the prototype will be made in 6al4v Ti. If its just for spinning very fast (no load) I will make a 14mm dia rotor, the mechanical limit for the small one will be somewhere around 2-3million rpm before it goes into orbit and...

Ah I see, the babbits dont have moving parts, and a thin oil-film in between the parts?? I guess you can make a similar one out of some cobalt based superalloy, I have worked with that before, its very slick, low friction material, only downside of cobalt based superalloys is the cost. I'll...

Thanks for your answers! I have never heard of a babbit sleeve bearing, I have to look it up. I was going to order the SKF catalog since people told me there were tons of good info there, I know they know their stuff, my brother used to work there (we're in Sweden). Anyway if anyone has heard...

Hello, I'm about to build a small gas turbine engine, about the size used in RC models, so now I would like to know what type of bearing I should use. I'm aiming at absolute maximum rpm, the bearing will most likely be the limiting factor, foil bearings and electromagnetic ones are out of the...

Hi guys i am about to make a toolarm for a machine, and now i have a few questions. I have dia 14,4 mm round bars (6Al4V) which i want to thread (the outside), i was thinking M14x2. according to my machinist book the outside diameter before making the threads should be 13.8 mm. However i read...