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  1. CalculatorDave

    Stereolithography of acrylic lenses?

    Good morning, Has anyone worked with a plastic rapid-prototyping company that can quickly make acrylic lenses? The ability to make refractive optics using STL appears limited, due to the "step-wise" structure of an STL part. Neverthless, I would like to find a company with this capability...
  2. CalculatorDave

    Pre-wired, panel-mounted, DC power jacks?

    Mcgyvr, Point taken. Hardware selection is difficult without specifications. However, in this case, I chose to leave the specifications open, because I was willing to modify my design to accommodate the available DC jacks. Some advice to you, for the sake of your career: Although you make a...
  3. CalculatorDave

    Occupancy sensors: crossover for Wattstopper FSP-211?

    Howdy All, I'm trying to find a crossover for the Wattstopper FSP-211 occupancy sensor. This is a real Cadillac occupancy sensor - remotely programmable ramp up/down of light level, high/low brightness levels, daylight harvesting threshold, wet-location-rated, etc. I'm trying to find a...
  4. CalculatorDave

    Pre-wired, panel-mounted, DC power jacks?

    HI SceneryDriver, These could work, but are too expensive for my application. Very good find, neverthless. SolarDave
  5. CalculatorDave

    Pre-wired, panel-mounted, DC power jacks?

    Howdy All, I'm having a hell of a time finding off-the-shelf, pre-wired, panel-mounted, DC power jacks. It is common to find pre-wired, non-panel-mounted DC power jacks, but not panel-mounted ones. Does anyone know any sources? Thank you
  6. CalculatorDave

    Will a 'bad sounding' criminal conviction from long ago keep me from finding work in the field?

    The key word here is "misdemeanor". I've never seen a job application where misdemeanor offenses had to be listed. Behave yourself.
  7. CalculatorDave

    "Bonded" contact set fails to implement

    Howdy all, I am running a SolidWorks Simulation static stress analysis on an assembly, and I'm having a ridiculous problem. I must bond a simple cylindrical feature into a simple hole feature of exactly the same diameter. However, during the simulation, the two repeatedly fail to bond. The...
  8. CalculatorDave

    Concrete Shear strength ??

    DaveMinter, There is a formula that relates shear modulus to elastic modulus, i.e. the elastic behavior of a material. HOWEVER, there is NO general formula relating the ULTIMATE (fracture) strengths in tension, compresion, and shear. To find the shear strength of concrete, one must carefully...
  9. CalculatorDave

    Reinf. concrete vs. steel columns: cost comparison???

    Howdy all, I'm looking into the comparative cost of structural columns made from steel pipe vs. reinforced concrete. I'm guessing that reinforced concrete columns are cheaper, since that's how they construct freeway overpass columns. However, it would be great to have some approximate numbers...
  10. CalculatorDave

    Approx. price of ironworker machine?

    Hey y'all, Does anyone know the approximate of an ironworker machine, with the ability to punch 3/4" holes in 1/4" thick ASTM A36 steel?
  11. CalculatorDave

    Will acrylic PSA inhibit the migration of plasticizers from PVC foam

    Howdy all, I'm considering substituting a PVC foam tape in place of a urethane foam tape. The issue is the risk of plasticizer migration from the PVC foam to the adjacent substrate. Question: do you think that the foam tape's acrylic PSA would act as a plasticizer barrier, which would block...
  12. CalculatorDave

    Salvaging waste polyethylene

    If you live in California, Google "CalMAX", the California Materials Exchange. Separating composites, in order to recycle their constituent materials, is difficult. There is a large market for post-consumer recycled polyethylene, although you won't make any money doing it. I have seen...
  13. CalculatorDave

    Floworks: streamlines passing THRU solid :(

    Problem solved. It was simply that my Initial Mesh settings (the default ones chosen by FloWorks) were too coarse. When I manually selected the gap size and wall thickness values, everything ran fine. You would THINK that FloWorks would choose default values that were appropriate.
  14. CalculatorDave

    Floworks: streamlines passing THRU solid :(

    Howdy all, In Floworks, I am seeing fluid streamlines passing, erroneously, right through a solid assembly. I am running a Floworks analysis of fluid flow over the exterior of an assembly. I ran several analyses very successfully. BUT, when I made a small change to the assembly (and had...
  15. CalculatorDave

    Seek aerodynamic moment coefficient table for thick plate

    Howdy all, I'm trying to find tabular values, or an equation, of the moment coefficient for a thick plate subjected to wind forces, at various angles of attack. I suspect that the "thin plate airfoil" equations will not work, because my plate is pretty thick relative to its chord and span...
  16. CalculatorDave

    Thin shell assembly meshing difficulties

    Howdy all, I have had consistent difficult in achieving proper meshing of thin shell assemblies in COSMOS. When I run the model, I get a message saying that there are "insufficient constraints", meaning that the parts of the assembly are not bonded together, at least as COSMOS is concerned...
  17. CalculatorDave

    Thin shell assemblies, bonding

    Howdy all, I have an Assembly with parts have fail to bond during FEA: I have Cosmos Professional 2006. I have built an Assembly from Parts. Each Part is made from zero-thickness surfaces. I assembled the pieces, mated them, and ran a linear statics analysis. Some of the pieces fell away...
  18. CalculatorDave

    PVC foam plasticizer migration issue

    Howdy all, I am considering spec'ing a flexible PVC foam with an acrylic pressure-sensitive adhesive backing. This material would be stuck down to a plasticizer-sensitive substrate. Do you think that the plasticizers in the PVC foam could migrate through the PSA and harm the substrate? I've...
  19. CalculatorDave

    Application method for 3M transfer tape

    Yes, the 3M Scotch ATG 700 dispense gun is designed to dispense adhesive transfer tape
  20. CalculatorDave

    Acrylic Bonding

    Try methylene chloride solvent cement. Chemically welds acrylic together. Dries fast(!) and clear. Do Google search for "Weld-on"

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