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Recent content by EngAP

  1. EngAP

    Effect of Uniform High Pressure on Structure of Polymers (HDPE & PU)

    I'd like to know how the properties of HDPE and PU vary when uniformly exposed to high pressure (up to 30MPa). Please discuss. Note that this is NOT a pressure vessel application.
  2. EngAP

    Plasticizers

    Is it correct that it is only really PVC that is able to absorb plasticizers in high (>20%) quantities? If not is it possible for Nylon to contain high quantities of plasticizers, specifically phthalates? I google searched with little success.
  3. EngAP

    Leaving the first job and dramatic life decisions

    Not everyone has the luxury of a mentor at all. Read relevant texts, network etc. If you put the effort in it is not that hard to work out how to do it on your own, it just seems like it to start with. Then all of a sudden you are no longer scared about it and get a sense of achievement that...
  4. EngAP

    Plastic material which is permeable for IR (infra red) signals

    The questioner asked specifically: "Can anyone tell me what plastic material shall I use for device with IR antena(reciever)?@ Followed by: "it should be LESS transparent for human eye to hide what is covered inside." I therefore suggested a material that would fulfil this criteria, in the...
  5. EngAP

    Sarcasm

    Patprimmer - I am not directing this at any particular person, that was just a small example I highlighted. I am interested in the general tone of a lot of replies. I was not offended by your remarks and, as you can see, I had the technical information to back up my reply to the questioner. I...
  6. EngAP

    Sarcasm

    That is my point - if someone is busy then wy waste time replying when not replying at all would save even more time?
  7. EngAP

    Heat Sink Surface Finish & Flatness

    Thanks - that's pretty much what I thought.
  8. EngAP

    Sarcasm

    I think my question came across as a moan rather than a question. I hoped it would start off a debate (which it seems to have done, although mnostly one sided against myself!). I am not offended myself as I am more than capable of replying to any sarcasm if I were inclined. I have found...
  9. EngAP

    Heat Sink Surface Finish & Flatness

    I am looking for information regarding heat sink surface finish and flatness. My particular problem is as follows: I have a small extruded aluminium heat sink (approx. 25mm long, 20mm wide and 13mm fin height) with 15W dissipated from a small (10 by 12mm) heater. The heater is screwed onto...
  10. EngAP

    Sarcasm

    After browsing these forums for a while I have noticed a lot of sarcasm in answers. Maybe some questioners desevre it for posting questions that a little hard work would solve but I have also seen it widespread in response to very good questions/answers. As an example I recently replied to a...
  11. EngAP

    Plastic material which is permeable for IR (infra red) signals

    I am not sure how they do it but the variants have been developed specifically to transmit near IR and block out visible light. The spectrum graph for the two variants I suggested suggests theat in the visible light range transmissivity is as follows: 2805 Wavelength: <700nm, transmittance...
  12. EngAP

    Plastic material which is permeable for IR (infra red) signals

    The gentleman may want the parts behind to be hidden for aesthetic reasons. A normal user of such devices would not be inclined to see what is inside so would not take it apart. The gentleman asked how to make it transparent to near IR and opaque to visible light. Maybe a bit late to help but...
  13. EngAP

    Dimensioning Hole Wizard Holes in a Drawing

    AnnaWood - yes, the drawing rather than the sketch. drawoh - yes, that is how I tend to do it for all other dimensions however I could not get it to work for hole wizard holes. However I have found the answer. I re-created the holes by pre-selecting the face before clicking drawing wizard and...
  14. EngAP

    Dimensioning Hole Wizard Holes in a Drawing

    Hi, I have never worked out how to automatically dimension holes created using the Hole Wizard in a drawing. If anyone knows could you help. Thanks.
  15. EngAP

    Wind Adjusted Heat Transfer Coefficient

    vpl - Thanks for the interest. Basically it is a sealed enclosure exposed to ambient temperatures as low as -20°C that has to have in internal ambient temperature guranteed above 0°C. Without a fan there are large differentials in the internal air temperature distribution but this is pretty...
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