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  • Users: globi5
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  1. globi5

    PET machining?

    Does anyone have experience in machining/milling of PET (Polyethylene Terephthalate)? Cutting speed parameters, tools (number of flutes), cooling liquids/options... Thanks in advance.
  2. globi5

    Electric vs. mechanical water pump

    Actually it is more about the power requirements of a mechanical waterpump. Most electric water pumps draw between 100W and 200W. However some claim that mechanically driven water pumps draw several HPs. Does anyone have any data about how much power a mechanically driven waterpump requires? If...
  3. globi5

    Different cam profiles on the same engine?

    Are there examples of engines that used different cam profiles on different cylinders of the same engine? Obviously due to variable valve timing this would be an obsolete way to flatten the torque curve, but have engine designers in the past ever produced engines with different cam profiles on...
  4. globi5

    Carburetor jetting?

    I'm trying to understand jetting on a carburetor for a 125cc 2 cycle engine. Apparently the diameter of the mainjet can be determined as: d2=d1*(ad2/ad1)^0.25 (d=diameter and ad=air_density) First of all, why is it ^0.25 and not ^0.5? If one doubles the diameter of the mainjet, the fuel flow...
  5. globi5

    Are patents worth anything?

    I've been working in R&D for several years (mostly MEMS and small electromechanical products) and noticed that it has generally never been considered to license any IP from anyone - unless a working product was already available and then we would purchase the product anyway (the fact whether it...
  6. globi5

    Elastic piston

    I heard that Ford was working on elastic pistons at some point, but couldn't find any information online. Does anyone know more about this? What was it exactly and what were the results? (There's supposed to be an elastic connection between the piston crown and the actual piston.) Advantages...

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