Replies to post #22058 on Sigma Labs Inc (SASI)

[Jackle]

Sorry i cant help with the technical part of your question but it reminds me of something Greg Morris talked about recently. Whilst i have no reason to believe that 3D printed parts had anything to do with the malfunction, he did pick on an important point. That was that many people will be able to additively print in metal, but at some point a legal issue will arise where people will become liable for a defective part made in the 3D process. It's easy to print, but hard to print perfectly. He was stressing how inspection was a very important part for GE to get right regardless of how 'easy' 3D printing was. Christine Furstoss has also said similar. Apologies for not having the links on hand right now.

Bottom Line is, generic metal 3D printing has defects. A solution is needed. Obviously most of you here are aware that solution is what Sigma is attempting to provide

[peafunke]

Oxidizer valve is used to mix two forms of fuel. Probably liquid oxygen and some other liquid fuel. ( or air and
Fuel). It usually looks like a Venturi that uses either a ball actuated or variable pneumatic valve to control flow of the liquid into the flow. The fuel will either be pressurized or get 'sucked ' into the Venturi created by the low pressure due to the in the Venturi. Think of a stream or tier that pinches. The flow increases at this location. With any fluid, this creates a low pressure. It also is a good place to 'mix' fuel. Which in this place is oxygen of some sort.

Hope that's not too wordy.