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Recent content by Cryo1

  1. Cryo1

    Up and Down Do Not Generate the Same Load Curve

    Let me add more detail to this thread: The cable load in the image starts at 9 lb at the beginning of the stroke and applies 45 lb at the end of the stroke. The increase is linear. The spring in the image is used to push the handle down when released. There is some friction in the cable that...
  2. Cryo1

    Up and Down Do Not Generate the Same Load Curve

    The image of the resultant load curves.....http://files.engineering.com/getfile.aspx?folder=6b3fa588-5c6e-486a-a344-157f8f5fbfa5&file=CHART.png
  3. Cryo1

    Up and Down Do Not Generate the Same Load Curve

    The image of the device.....http://files.engineering.com/getfile.aspx?folder=72e0675f-1503-495f-b3bd-4d6f566f35b0&file=MOCKUP.png
  4. Cryo1

    Up and Down Do Not Generate the Same Load Curve

    We have a problem understanding the functional hysteresis in the device shown in the image. The force applied the lower link in the picture is from a spring pack capable of producing 9 to 45 lbs load. The attached graph shows the upward movement of the device's handle requires more force than...
  5. Cryo1

    Designing Vibration Fixtures

    The simplest thing we thought of is a block or cube to mount to the table and placing the UUT on each exposed face. What I was told to use in the in attachement below. Each block represents a aluminum block and everything is held together with bolts...
  6. Cryo1

    Designing Vibration Fixtures

    We are designing fixtures for ESS and qualification testing. We keep hitting a wall with management over the design. The engineers say "build a cube, and bolt directly to the test shaker." How common is a cube structure in vibration testing? Why not bolt directly to the shaker table?
  7. Cryo1

    Dimension to image in Drawing

    Thanks for the comments. I'm using SW2007 SP 3.1. We have found that the white in the image will disappear during printing and the notes and sketches will show through. You cannot adjust the transparency in SW. SW does not recognize the white transparency background in the PNG file...
  8. Cryo1

    Dimension to image in Drawing

    "Not sure how this wouldn't work." I guess I'm lucky today. I've placed the image on the sheet view and used "edit sheet" to place it in the background. In both cases, the image covers any sketch that overlays it.
  9. Cryo1

    Dimension to image in Drawing

    Nope. That doesn't work.
  10. Cryo1

    Dimension to image in Drawing

    We have some old drawings and we want to "recycle" for a new project. I have drawing views captured and saved as PNG, TIFF, JPEG, and BMP formats. The images have been clean up of old leaders, balloons, and artifacts. I want to lay the images in a new drawing and add SW custom balloons. I...
  11. Cryo1

    Aluminum on Steel Spline?

    Personally, I'm not worried. I think we can work the system out to hand the mechanics and strengths. The problem is others who have never seen a system like that and are risk adverse.
  12. Cryo1

    Aluminum on Steel Spline?

    Thanks for the Lewis formula dimjim. What I am concerned about is fretting and wear. Does any one in this world mate steel to aluminum splines in a non-slip application?
  13. Cryo1

    Aluminum on Steel Spline?

    Philrock, There is no lubricate. The moment force around the splines longitudinal axis is 150 in*lbs. So what do you think?
  14. Cryo1

    Aluminum on Steel Spline?

    Nominal Force: 150 in-lb 1" length 1" nominial pitch dia. 48 teeth SAE Standard 1946 The issue isn't the strength but the wear that may occur with the combo of steel+aluminum.
  15. Cryo1

    Aluminum on Steel Spline?

    I have a steel external spline. The new retrofit housing that fits on the spline will be aluminum 7050-T6 condition with hard anodize coating. The assembly is turned by an human, not a motor. There is no sliding on the spline. Stresses look OK but.... ?Will this steel/aluminum interface wear...
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