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Member postings for Joseph Noci

Here is a list of all the postings Joseph Noci has made in our forums. Click on a thread name to jump to the thread.

Thread: steam turbine and generator
20/01/2011 20:42:51
Use one of the 3 phase brushless motors either from the RC helicopter or RC car racerworld. They are the 'in-runner' type, and esp the helicopter motors, will do up to 50 to 60000 RPM. The smaller T-Rex 'copter motors run from typically a 22 volt battery pack, and at 60000 rpm, ie, about 3000 RPM/volt. They are VERY efficient, and just as efficient as generators ( or rather, alternators) at 60000 RPM you will easily get 50volts at8 to 10amps from such a motor ( about 35mm diameter and 65mm long). Use 6 diodes to rectify and away you go. Although, I suspect that 500 watts is somewhat an overkill; in a steam turbine to deliver that power will be interesting...
There are lots of smaller motors in that type, down to around 80 to 100 watts as well.
The 'out-runner' type, where the outer case containing the magnets rotates, is not good for high speed, but great for high torque. In the 'in'runner', the inner rotor ( again, the magnets) rotates, and the outer plus windings is stationary.
Build the turbine first and see what is can deliver.
Ciao
Joe
Thread: Milling PCB
09/11/2010 20:00:00
I use a PCB CAD design package to create GERBER plot files of the PCB layout, and then convert this to G-Code using 'DeskPCB' from IMService (Google them..). It works quite well, some warts in the conversion that you can work around, but when you know how to do it, it works VERY well, I have milled many boards, with surface mount integrated circuits  down to 0.6mm pin spacing. DeskPCB was around $100, if I remember correctly...well worth it.  The secret is in having the PCB co-planar with the the engraving cutter horizontal path, and a very sharp cutter, 60 degree V tool, penetrating the copper about 0.02mm below the copper underside. High speed is essential, around 25000rpm min.
 
Joe
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