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  1. earnest

    Spring Design û Change in Diameter with Compression

    I too, would love a simple formula for spring expansion (and contraction). I checked SMI but the software is $600. So, that brings me back to this thing: change in D= 0.05 * (p^2-d^2)/D If pitch is units of 1/L, then this isn't math. If its in L per turn what are the units? Also, the...
  2. earnest

    TP/TPE co-molding ("Soft-touch")

    I am starting an injection molded plastic part design using the ubiquitous "soft-touch" elastomeric co-molding method. I'd appreciate some basic advice: 1. How does the method work? Is the part completely ejected from the TP mold, stockpiled, and manually placed in the TPE mold? If so...
  3. earnest

    ACME Screw Thread Inspection

    The 3G designation for both the screw and nut is v.important to the final function. Aside from the usual thread variables: pitch diameter (which can be measured over pins) and thread pitch the major and minor diameters are also critical. The reason is: What are the radial loads on the screw...
  4. earnest

    fine threads versus coarse threads

    Its the tolerances! Here is my attempt to cut through the confusion and concomitant resort to cookbook formulas and facile rules of thumb - We are comparing the strength of externally threaded fasteners with a: coarse pitch and b:fine pitch threads. What are we holding equal? The material &...
  5. earnest

    NPT Threads leaking.

    corrosionman's suggestion is v. good. I had a similar problem with a stainless NPT fitting in Aluminum - medium was steam/water - sealant was locktite PST. As built, nothing leaked, but after long term testing leaks often developed. What we noticed was, if there was galling during assembly -...
  6. earnest

    Solidworks Performance Problems

    for the benefit of theophilus: I had the same Photoworks problem and questioned SW about it: Photoworks needs your TCP/IP installed. Apparently, it wants to talk out. Preferably, SW - which is clearly pushing the limits of what a PC can do - should not be on a system which connects to all the...
  7. earnest

    solid works v autocad

    I've spend a lot of my life with AutoCAD, Mechanical Desktop and Solidworks. SW is my choice for physical models and assemblies but Acad is still the best sketcher when you have to solve a tricky 2D problem. SW2001 has a truly amazing sheetmetal package.
  8. earnest

    LISP ROUTINES FOR CNC PROGRAMMING

    We use CAMWorks, a SolidWorks add-in, as a general toolpath generator. (If anyone has comments or questions on CAMWorks, I'm interested...) Anyhow, there are times when you need total control of the tool eg: strange undercut tools, using mill as lathe etc. G-Code is a pain and AutoCAD, for all...

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