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Recent content by Luke4b

  1. Luke4b

    Book/study recommendation for designing refrigerant circuits

    I've got a project that needs a refrigerant cooling circuit. I am going to need to size the various components of a refrigerant loop to cope with the heat rejection requirements. Could anybody please recommend some reading/study material, ideally that gives an example of specifying a full...
  2. Luke4b

    DIN5480 spline, measurement over balls calculation

    Thank you very much, that has fixed it. I'm not sure where (pi·m -e)/d comes from though, that table 9 in DIN5480-15 definitely states (pi·m-e)·d I'm not sure what the physical meaning of BETA is, but had imagined it was suppose to be around 30 (the pressure angle) and suspected that was the...
  3. Luke4b

    DIN5480 spline, measurement over balls calculation

    Not a programming problem. The program runs fine, it's just a representation of the maths (as it's an iterative problem). Using positive values for d I get a positive value of Factor B: Factor B = (pi*m -e)*d = (pi* 3 - 6.305) * 114 = 355.6547 invBETA = 355.7112 (or 355.8175 if I swap the...
  4. Luke4b

    DIN5480 spline, measurement over balls calculation

    Thanks, that helps highlight whereabouts in the calculation I've gone wrong. I was calculating Beta with an implementation of the basic program in the standard written in VBA. I've actually iterated this by hand for the first 6 or so iterations to double check I'm getting the expected results...
  5. Luke4b

    DIN5480 spline, measurement over balls calculation

    I've been working through the spline design example given in DIN5480-1 (120 x 3 x 38 x 9H 8f) but using the calculations given in Table 9 of 5480-15 I am struggling to match the measurement over balls values given in DIN5480-1 Fig6. I'm assuming that values for e/s should be substituted for...
  6. Luke4b

    Conditional sketch geometry using logic

    Thanks, I wasn't quite sure how to do that either but I've figured it out.
  7. Luke4b

    Conditional sketch geometry using logic

    I want to add some logic to a model so that part of a sketch has either a line or an arc drawn dependent on the value of a parameter. So if 'Parameter' > 1 then draw as a line else draw as an arc. Either the arc or line need a tangency condition at one end and a coincident condition at the...

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