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Recent content by PBPouw

  1. PBPouw

    Welded Aluminium Structure

    Why not a simple sheet metal riveted enclosure ? - cheap - easy to do stress calculations - easy to modify if necessary - very simple to add local re-enforcements, stringer, angles etc.... I mean we have been building rivet sealed airframes for more then 80 years !
  2. PBPouw

    Inspected Screws

    I am very surprised to see that you are very concerned about using a Aerospace grade type bolt but the thing you are bolting down, the vibration mount is of no concern an can be modified without the manufactures approval. If the vibration mount has metrical screw threads I would guess that this...
  3. PBPouw

    Changing / Linking multiple hole parameters together

    I think I have to do a DIY KWE course when the work pressure is lower ! Can you give me a short course ? [rednose] and or a bit more which exact function I have to use, this because I tried and failed..............
  4. PBPouw

    Changing / Linking multiple hole parameters together

    I received from a customer a double contoured part with around 200 countersunk holes in them. I am asked to change all holes to an other diameter and without countersunk. Is there a way to link all these 200 holes to the same set of parameters? Offcourse without linking every hole separately...
  5. PBPouw

    CRES installed on CFRP

    I don't think the question is why the Aerospace standard is not to install Cress on CFRP, it's more that Cress is overall not the preferred fastener material because it is weaker then it's steel equivalent. So the steel variant is smaller / lighter than it's Cress equivalent. Be careful with...
  6. PBPouw

    Free run tolerances on gear pump

    Thanks all for the comments. Some more data, The 0.008" freerun is the measured as a worse case scenario on the actual pump which is worn out, so yes this is way too big. Still this worn out pump during testing puts out around 500 Psi. On the pumphouse the bore is measured ( undamaged area )...
  7. PBPouw

    Free run tolerances on gear pump

    Thanks Ted, The tolerances you mention on the Shaft to Bushing are almost identical to the ones I measured from the existing pump. The free run tolerance on the geartip - pump house seam to me a bid close. The problem here is that the housing is made from aluminum 2024, so any contact between...
  8. PBPouw

    Measuring clamping forces

    Why don't you use this type : Then find a spring which bottoms out out your desired maximum force and place this between the body and the thumbscrew. If you can pull the panel without the springs bottoming out you know you are within the limit. You can even measure the force with a feeler...
  9. PBPouw

    Free run tolerances on gear pump

    Hello All, I am trying to reverse engineer a hydraulic pump used on a 1944 warbird. The pump we have has been damaged and only delivers around 500 psi were it should be 3000 psi. The following data : Hydraulic Pump - Prop Governor Max RPM = 6800 Max Pressure = 3000 PSI Fluid =...
  10. PBPouw

    Duplicate Catpart with external links

    Thanks Azreal, [upsidedown] Think I have to put my nose in the study books. [smarty] This is completely new material to me.
  11. PBPouw

    Duplicate Catpart with external links

    Azreal, can you explain a little further how do I use metadata instantiaton ( couldn't find it on the web ) and where can I find it in Catia. I already had the thought that you need published elements.
  12. PBPouw

    Duplicate Catpart with external links

    The Youtube exactly shows how not to do it ! Look at time 5.11 Catia gives the following warning : The reference of the component Rib2.1 is a new version of a contexed component to be able to edit it yo must -either isolate it -either define its new context Further look in the external...
  13. PBPouw

    Duplicate Catpart with external links

    I have a Catpart in an assembly with external links. Now I want to copy / duplicate this part to create a same part with the same links but lets say 10 inch to the left. For example a airplane metal rib, I have created rib no 1 with external links to outside surface of the wing. Now I want to...
  14. PBPouw

    free propeller efficiency (analytic)

    Not much has changed on subsonic propellor design since WW2. The old NACA reports are still valid. See : http://naca.central.cranfield.ac.uk/reports/1938/naca-report-640.pdf Or : http://naca.central.cranfield.ac.uk/reports/1938/naca-report-642.pdf ( Propelor efficiency in the presence of a...
  15. PBPouw

    Acoustical Scanning of Airframes, etc

    Fokker aircaft started building bondeded aircaft structures in the 1950's . To check the bonding they developed the : Fokker bond tester. Easy to find on the internet So yes the system is around a while...... Pim
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