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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

    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...
  3. 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
  4. 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...
  5. 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...
  6. 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?
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. CalculatorDave

    Fast, corrosion resistant joining of sheet steel structure

    Hello all, My question concerns "design for corrosion resistance" and "design for automation" of the joints of a sheet steel structure. The structure operates outdoors, with an expected service life of 20 years. Our sheet metal structure is made from pre-galvanized sheet steel. Our current...
  14. CalculatorDave

    Corrosion-resistant joints for sheet steel structure

    Hello all, My question concerns "design for corrosion resistance" and "design for automation". Specifically, the design of fast, corrosion-resistant joints for a sheet steel structure. Our material is pre-galvanized sheet steel. Our current joining method is clinching - this process has the...
  15. CalculatorDave

    corrosion prevention in sheet metal joints

    Hello, My question concerns the prevention of corrosion in the joints of a sheet metal structure. Our sheet metal structure is made from pre-galvanized steel sheet, and we join the pieces by clinching. The clinching process is relatively slow (about 1 second per clinch), but has the advantage...
  16. CalculatorDave

    VHB-like tape, 1/8" thick, for LSE plastics?

    Hi all, I'm looking for a double-sided foam mounting tape, closed-cell, for exterior use. The adhesive must adhere well to low surface energy plastics. 3M has such a tape, but its maximum available thickness is .045". I'm looking for 1/8" thick. Does anyone know of such a tape? David
  17. CalculatorDave

    Production planing of acrylic?

    I have an acrylic planing/grinding application as follows: I must grind down, to flatness, a regular pattern of grooves (8 mils deep) on the surface of a flat acrylic panel. I must do this at production quantities, in an automated manner. For removal of deep scratches in acrylic, I have seen...
  18. CalculatorDave

    COSMOS running of shelled surface model

    Hi all, I am modeling a sheet metal assembly for linear stress/strain analysis in COSMOS/Works. I have been approaching this by constructing the entire assembly from surfaces, as opposed to solids. By doing this, I can make the entire assembly as a single part. Also, because each sheet metal...
  19. CalculatorDave

    COSMOS modelling of sheet metal assemblies

    Hi all, I am trying to model a multiple-part sheet metal assembly in COSMOS/Works. I am attempting to build the entire model with surfaces (instead of with solids), to make it easier to select surfaces for shell-meshing. That is to say, if I WERE to build the sheet metal structure from...
  20. CalculatorDave

    Material selection question

    Howdy all, I'm trying to select a plastic, but am having a heck of a time. Here are the required properties: 1. Weldable ultrasonically 2. Low moisture absorption (< .03% ) 3. UV stable 4. LIght in color 5. SErvice temperature up to 80 deg. C 6. Injection moldable I have looked at UHMW...

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