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  • Users: rfer
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  1. rfer

    Will a larger Thermocouple wire gauge change temperature readings?

    I have a setup that came to me that I needed to make some changes on that is pretty much a black box. I can't open it to take measurements (more than once or twice) because it is constantly running tests at temp and RH%. No CAD for it. No one knows who made it, just that it came from another...
  2. rfer

    "Extended Temperature Range" Computer Vision Camera w/ Small Form Factor Recommendations

    Hi All, My apologies first off if this is not posted in the correct category. I looked around for a bit and could not find an ideal category to post in. This is quite a specific request, but maybe someone on here w/ more industry knowledge than I will know something off the top of their...
  3. rfer

    Matte Black Spray Paint to Prevent Laser Specular Reflections

    Awesome, thank you all for the help. This problem can now be marked "solved."
  4. rfer

    Matte Black Spray Paint to Prevent Laser Specular Reflections

    Awesome, thank you IR!
  5. rfer

    Matte Black Spray Paint to Prevent Laser Specular Reflections

    Hi, Has anyone used matte black spray paint on a machined metal surface to prevent potential laser specular reflections? Usually I have my aluminum parts used with laser systems Black Type II Anodized to help prevent specular reflections, but I can't do this in this instance due to lead time...
  6. rfer

    Small Diameter Radius Fillets and Price Increase (CNC)

    I see, thank you all!
  7. rfer

    Small Diameter Radius Fillets and Price Increase (CNC)

    Material is PEEK. I can't post a drawing of my specific part, but here is a pic of what I am talking about. Basically having these four fillets be R0.20 mm.
  8. rfer

    Small Diameter Radius Fillets and Price Increase (CNC)

    Excuse my ignorance on this subject, but why does using small radius fillets increase the price of the part for CNC machining? Radius size I am talking about is R0.20-R0.40 mm (R0.008"-R0.015"). The geometry I am talking about is top down vertical milling when removing a rectangular shape from...
  9. rfer

    Witness Line Length scaling with Witness Line Offset distance

    Hi, I have some witness lines on some dimensions referencing a number of rounds and fillets. It seems like the Witness Line Offset value in Drawing Properties affects the length of the witness lines displayed. With Rounds scaling proportionally to the offset value and fillets scaling inversely...
  10. rfer

    Brief Condensation Question

    Thank you. This makes sense.
  11. rfer

    Brief Condensation Question

    If I have a climate chamber - elevated temp and RF%, and have a sheet of transparent acrylic inside. Steady state conditions for both temp and humidity - so acrylic sheet is the same temp as air. Will condensation form on the clear acrylic sheet? I am thinking condensation will not form on...
  12. rfer

    Low CTE Rapid Prototype Polymer

    Hi, I am looking for a low CTE polymer for rapid prototyping. This polymer can be filled (glass, carbon fiber, etc). I need it to have a CTE around 15 ppm/deg C. It also need a glass transition temp, T_g > 100 deg C. I have found Ultem 1010 and Ultem 9085 satisfy the T_g requirement, but...
  13. rfer

    Printing on Polycarbonate (or Acrylic)

    Hi IRstuff, Apologies for the delayed reply. I am trying to measure the length of the laser projection on the flat acrylic sheet. I found out a subset of one of my company's machine shops has the ability to print directly onto acrylic and was able to print this pattern accurately enough for my...
  14. rfer

    Fill Sketch

    Hi dgallup, Thank you for this advice. This worked well for me. Have a nice day!
  15. rfer

    Fill Sketch

    Hi All, This is for Creo 4.0. I feel like this should be a simple task, but I am stuck. I've made a sketch (Model>Datum>Sketch) of a grid of circles on a flat plane. I want to now fill these circles black. Right now they are just empty circles that I have changed the line color to black...
  16. rfer

    Printing on Polycarbonate (or Acrylic)

    Hi All, Dimensions of the polycarbonate sheet are 270 mm x 380 mm x 6 mm. Purpose of polycarbonate sheet is to serve as a target for a laser pattern (bottom side of sheet is frosted). Camera w/ computer vision application measures the laser pattern. Having the grid printed on the frosted...
  17. rfer

    Printing on Polycarbonate (or Acrylic)

    @IRstuff So long as the dot grid pattern is accurate to itself to that tolerance then it is sufficient. So the pattern is floating. If it is a square pattern, and d is the distance between each dot, I need the printed distances to be d+/-0.1 mm. If the pattern is accurate to this, but the...
  18. rfer

    Printing on Polycarbonate (or Acrylic)

    Tolerance of +/- 100 microns. +/- 50 microns if possible.
  19. rfer

    Printing on Polycarbonate (or Acrylic)

    Hi All, I am trying to print a camera calibration dot grid on a polycarbonate sheet I have. I need this grid to have a high tolerance. I have reached out to a number of places that specialize in printing on acrylic, but all are for photography, portraits, etc., and thus have very poor...

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