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  1. bcavender

    What polymer is this (or anything close)?

    These material samples exhibit really high stiffness with just a smidge of flexibility to take a hit w/o fracturing. The product is a composite construction siding described as a "proprietary polymeric resin and granular stone" (called C Core - Chelsea Building products) probably targeted as a...
  2. bcavender

    FEA Standard Models: Accuracy Testing

    Are there any standard 3D models with material and load data that can be downloaded for testing of computational accuracy of FEA tools? (Or some equivalent?) Best regards, Bruce
  3. bcavender

    Good Source for Polyurethane Foams

    Can anyone recommend a good supply house that can deliver medium & high density PU foams? I spent 5 hr yesterday surfing/calling and only found one guy interested in making a sale, but he had to go find someone that could answer questions about their foams’ performance specs. I scan chemical...
  4. bcavender

    What 3D printer …

    …. have you had good results with for early stage part design visualization? Speed, accuracy, materials Pros & Cons for it? Best regards, B
  5. bcavender

    250F Heating Application: Need two flexible, different high temp fabrics

    I have a heating project that needs a flexible application of continuous heat as a two dimensional secondary operation takes place. To make the tool easy to construct, it would be helpful if the material could be sewn with a high temp Kevlar thread. The physical forces of tension in the fabric...
  6. bcavender

    Does a material with these characteristics exist?

    The problem is to perform a secondary operation on a hollow and irregularly shaped CPVC shape. The secondary opp potentially can take the CPVC shape above the temperature where it can become soft and have its shape compromised. (Performing the operation earlier in the build cycle is out of our...
  7. bcavender

    Filling Silicone Rubber: TCE Variation

    thread335-506939 GoGreen’s blending question raises a question about modifying a rubber’s coefficient of thermal expansion by a filler. For an example, let’s take SiliconeRubber and Graphite. TCEs: Silicone Rubber 190 (10-6in/in-degF) Graphite ~ 2.2 (10-6in/in-degF) If I create a...
  8. bcavender

    Silicone Rubber Product Recommendation Request

    I am looking for a two part, pourable, semi flexible, silicone rubber material (or better technology) that can handle a large number of thermal cycles from ambient to appx 230 degrees F without surface spalling, cracks, etc. Cured molded part maximum bending would be less than 5% in any...
  9. bcavender

    Source of Practical Information on Heat Bending PVC Extrusions

    I need a good resource(s) on the processes used for bending PVC extrusions that goes into the basics of the material and possibly gives tips, example cases, etc of practical methods. All comments and suggestions welcome!!! B
  10. bcavender

    Need a solid fill material between concrete and aluminum

    On a poured concrete job, there was a form problem that left a real uneven bottom to a 3’ rectangular opening. The metal to go in is already fabbed. This leaves a space that varies from nil to about 3/8”. This space is subject to long term water splashing, but not under high pressure. The goal...
  11. bcavender

    Need a practical fastener reccomendation

    I have two simple links that I need to couple. The links nest together tightly plus the angle of rotation of the links is small and any rotation is occasional/very slow like you would find in a hinge. The major static force on the 12mm pin will be approximately 200 pounds in linear tension...
  12. bcavender

    Combustion Products Calculation

    A friend asked me to calculate the exhaust products that would be produced by a propane powered IC engine generating 5kw electrical at a fuel efficiency of 33%. This is my first cut at the solution … but engines are not my expertise at all and my chemistry skills are inexperienced at best. I...
  13. bcavender

    A permeable material that does NOT experience a force from the magnetic field it conducts?

    A friend asked me if there were any materials that would significantly transport a magnetic flux WITHOUT being attracted or repelled by the source of magnetism. My quick response to this question was 'Not in my experience'. Like a switched reluctance alternator, energy must go into the rotor...
  14. bcavender

    SAE5 Bell Housing Speed Increaser

    I need to find a manufacturer of a gearbox that will buckle to an SAE5 engine housing (with 7.5” flywheel-1200 rpm-125 ft-lbs) and deliver 1800 rpm to drive a 4 pole alternator. Potential volume is 10-30 units first year. (Unfortunately it appears no alternator company builds six-pole...
  15. bcavender

    Most Efficient Torque Producer

    Given a source of clean 100-300 psig air, what device design would have the highest efficiency for extracting/delivering energy? What is its advantage?
  16. bcavender

    Seeking magnetic induction software recommendation

    Hello all! I am looking for a software that would allow me to simulate/compute induced AC voltage in a coil. VIZ: A coil of n=100 turns with a centerline diameter d of approximately 6”. At the bottom of this coil there is a magnetic circuit around that part of the coil with inside/outside...
  17. bcavender

    Powder/Pulverizer for Organic Material

    Powder Making Machine I was approached by a client to find a ‘continuous powderizer’ (passing 25-35 mesh) that can reduce 115 kg / hour (254 lbs/hr) of finely chopped, relatively soft ‘organic material’ at appx 5% moisture content into dry powder residue. That’s around 4.25 lbs of powder /...
  18. bcavender

    Pressure gradient in a low pressure, low flow, dry, natural gas well

    A natural gas well with a 6.25" bore was gauged at 45 psig after 20+ years of being shut in. For eight years, an estimated 101.1MCF has been delivered to the burner tip annually. (An average daily draw of 277 SCFD is based upon a meter installed last year to capture total &...
  19. bcavender

    Seeking small HP engine recommendation

    I need a reliable stationary engine in the 7-8 HP range that can run reliably 24x7 (short downtime for filters, oil changes and basic maintenance excepted) for 17,500 hr (2 yr) between rebuilds. Cooling: Water cooled preferred Fuel: NatGas RPM: 1200-10,000 Range adaptable That seems to leave...
  20. bcavender

    4 Cycle Energy Question

    Of the energy input to compress fuel/air molecules in stroke two, what percentage of this input work is returned as useable energy (above the energy released from the fuel) in the expansion of stroke three? Thank you!

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