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  1. threeway

    Calculating pressure loss through porous plastics

    I know of the Darcy-Forhheimer equation (Delta p = C1*V^2+C2*V), which relates the pressure to the velocity through the porous surface, which is the relation I want. But the problem is that you need the coefficients C1 and C2, and I don't have those. I could retrieve them from experiments, but...
  2. threeway

    Calculating pressure loss through porous plastics

    Hello everyone, I am looking for a way to calculate the pressure loss through porous plastics, without data from a manufacturer. Is there any global theory about this? Or is one always refered to the manufacturers data ? Off course some information is required, like outer velocity/pressure...
  3. threeway

    Sealing of High Pressure Laminates (Welt rod)

    Hello all, My question concerns the sealing of two HPL wall panels, for use in a cleanroom. We're currently using silicone sealant (Dow Corning 798) but the way it looks depends strongly on the person applying the sealant. The walls have a 4mm gap between them, and a depth of 6mm. After the...
  4. threeway

    3d drawing --> excel sheet

    Hello, I'm trying to extract a list of parts from a 3d drawing. The list must be put in Excel with the sizes, materials and colour. Also each part must have it's own name. When I have this list in Excel I can create a sheet used by the sawguys, which use it to create the boards/planks so...
  5. threeway

    Software for an illustrated parts manual

    I'm working with Rhinoceros, real easy to learn and you just render your image and save as *.tiff, *.jpg, *.bmp etc. and then use it in Word or whatever you like etc. See www.rhino-3d.com for more information and evaluation. Just create different groups/parts to make a exploded view easy, and...
  6. threeway

    Hydraulic or Electric motor for thread screw?

    Greg Locock, thanks for your help. Using the same starter as the engine will probably not work (around 45ft. between the window and engine), like you said, a one in a million :) How about transferring the torque ? pully/belt ? sprockets ? coupling ?
  7. threeway

    Hydraulic or Electric motor for thread screw?

    Btw, it should also last around 15 yrs.
  8. threeway

    Hydraulic or Electric motor for thread screw?

    I looked into this type but I wasn't sure this could be used, since by my knowledge it draws huge amounts of A, which I believed isn't a good thing. Could you explain a bit more about a starter motor ? It would be a starter motor for a any kind of car/tractor right ?
  9. threeway

    coating to protect AISI 420c ?

    Hello all, We're developing a sliding window for a yacht and now we found a lineair guidance system of AISI 420c. No other usable slides+bearings are found until now, which can resist the different momentale forces (It does need to be lubricated to resist these forces). It's a slide with a V...
  10. threeway

    Hydraulic or Electric motor for thread screw?

    Hello all, Here's the problem: We need to lift a window (approx. 500N) at a speed of 70mm/s. The space were it's being build in has a total height of 800mm, were a stroke must be reached of 600mm. This way we thought of a trapeziodal thread screw with a seperate lineair guidance was the best...

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