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Recent content by robertib

  1. robertib

    Need help sourcing a custom-made Buna O-ring.

    My company Gencoa has been using Ø5.33 (3/16") o-rings in a rectangular groove similar to the one in the first post for over 20 years, with no issues for water to vacuum (3 bar to 10-3 mbar), as well as atmosphere to vacuum. The usual radius we have used safely is R10 (25/64"). The groove...
  2. robertib

    Need help in finding metric O rings

    It could be one of 2 options They can't supply the hardness you are asking for - you could ask what hardness they can supply They can't supply the section. There is one 'standard' size o-ring that could be used. Instead of 160mm, you could try to ask for a 159.30 (Size reference G160).
  3. robertib

    Need To Size an O-ring for Square Face Seal O-ring.

    We regularly use o-rings in this configuration, and our policy is to use the inner perimeter of the groove as equal to the inner circumference of the o-ring. From this we can set the o-ring ID. In our case, sometimes the pressure is on the ID, sometimes the OD, but we have had no problems with...
  4. robertib

    Need to check the state of parts in Windchill(Creo)

    If there is any way to create macros or equivalent, they will be Admin rights only. I have discovered that you can create custom views for searching, as well as any other table in Windchill (such as the Updates table on you home page) so that could be another option.
  5. robertib

    Need to check the state of parts in Windchill(Creo)

    The simplest option is as Dave said - add to workspace. You can then create a custom view with the file name, description & release state, and you can set a filter. In this case it would be Document CAD Document Criteria State You can set to to show specific states, or to exclude a state - eg...
  6. robertib

    Bulk Item Quantity Repeat Region Relation - Creo 5.0

    If these parts were true bulk items, you could use the parameter asm.mbr.type == "BULK" as a filter. Since you have created actual parts, I would add a YES/NO parameter to each 'bulk' part, and use that as a filter for the relations.
  7. robertib

    Sealing Thread

    I can tell you from experience that we have used BSPP thread, and used Loctite 5331 to seal on the thread - it's easy to use, low cost, effective & the seal can be broken & replaced with minimal effort. Otherwise, you are looking at using an o-ring, which requires precision machining to ensure...
  8. robertib

    Vacuum Leak Test - gauge and rate?

    Speaking as someone who works in the vacuum deposition industry, quantifying leak rates depends on what you are trying to achieve. 1. What is the seal for - liquid-atmosphere, liquid-vacuum, gas-atmosphere, gas-vacuum, gas-liquid, etc? 2. What is the difference in pressure between one side of...
  9. robertib

    Need advice shipping prototype overseas safely

    if you are trying to ship with a fuel tank (empty or full) you will have to get it packed by an IATA qualified freight forwarder. Butane is classed as a dangerous goods material, and needs to be packaged appropriately, with an official declaration of dangerous goods. Even without the fuel tank...
  10. robertib

    Urgent Help!!!! Dimensions driven by relations

    Further to what @looslib mentioned about testing, I would do the following Create a parameter CW as real Create a parameter LENGTH as real In the relations editor, LENGTH = CW-30 Test the relations work with different lengths of CW In the relations editor, add the following IF LENGTH > 0 D# =...
  11. robertib

    Pro/Program: swapping components in an assembly

    We have done this many times. My recommendation is to make a backup of your assembly & generic, and work with the backup until you are happy with the results, before making the changes properly. The way we have done this before is:- 1. Add an extra integer parameter to the model named...
  12. robertib

    Conversion of formula to userform or button

    In VBA, to use a spreadsheet function just add Application.WorksheetFunction. in front of the function.
  13. robertib

    A course to teach drafting to engineers who can do CAD

    Another variation on what's already been said. Before the class, create a series of drawings. In the class, have them create a model from a drawing - retrieve the drawings after use, so that they can't be used as templates. Then have someone else create the drawing for the model, and print...
  14. robertib

    Anyone have experience designing an asymmetrical o-ring groove under a bolt head?

    If you have the Parker Catalog, have a look at the triangular groove details (4-21 / p101 of their 50th anniversary edition catalog). It may be enough for what you are looking for.
  15. robertib

    how to make the "hole chart" visible??

    You will also need to have a unique name for the THREAD_SERIES parameter.
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