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  • Users: ryandias
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  1. ryandias

    Fastener Strength during Vibration

    When you size a fastener for a load, do you typically make allowances for variation in load due to vibration? Or would you hope that the variations are covered by a safety factor?
  2. ryandias

    Attaching Datum to leader line or feature control frame?

    Is there a difference?
  3. ryandias

    Unit Change - Defaults

    Is there a way to change the Units default values *(KG to Gram)? I want the default to be changed?
  4. ryandias

    Cracked Screw Bosses

    We are having trouble with some screw bosses I have designed...[sadeyes] I followed the standard design guides available online. The screw is a #4-20 plastite 45 screw. It secures the connector into a metal housing. The 2 of the 3 screws use a half slot, rather than a hole. These are both...
  5. ryandias

    Rules for Twisting Sheet Metal?

    Does anyone have some rules? I want to make a simple 90 degree twist in some thin copper lead frames (0.8 x 1.5mm). Max twist per length? Does the cross section stay reasonably similar? Is this an ok process for volume production (200k-500k/year) Similar to the image.
  6. ryandias

    How did Bearings end up predominantly metric?

    I have been working 8 years as a designer, and last week found out bearings are predominantly metric. I designed a test jig and ordered a 0.25" bore, 1" OD bearing from Mcmaster to fit the jig. When we got the bearings they are ultra cheap garbage, with about 1mm of play. I figured I'd just...
  7. ryandias

    Measurement of stamped parts (from coiled metal)

    I work for an electronics company, we use a lot of stamped copper parts. We have a power module that will get molded as a single stamped array of lead frames. This will be cropped to make the individual circuits later. Some of the GD&T is being debated with us from the supplier. The issue is...
  8. ryandias

    Import issues with STP

    I am having trouble with some models forwarded by customers. Consistently the parts come in to a single part file as opposed to being distributed in an assembly file. It is quite time consuming to try to separate their part into parts. Is there a better solution? I am not sure what options...
  9. ryandias

    Identifying a Resin, Can you identify two different brands of the same resin?

    I have an older part and a newer part built from the same mold. Resin batches were obviously not the same. New parts all crack easily. My first question is; was the correct resin used? Can PBTGF30 be compared and identified from Sabic, 3M, BASIF, Dupont? Would the FTIR test be a good choice...
  10. ryandias

    Silver Sintering

    Does anyone have experience with Silver Sintering? Pressureless alternatives such as Alpha's Agromax or Henkel's SSP2000? What would the best plating for a DBC be to work with these sintering processes?
  11. ryandias

    Unclear on the meaning - Help

    I have received a print with a Flatness tolerance attached to the Datum. As far as I know this is backward, or am I missing a second meaning or interpretation? I generally see datums attached to a GD&T tolerance. See attached image.
  12. ryandias

    Question about Plastic Thermal stability

    I am designing a plastic enclosure for electronics. I selected a PBT with no glass fiber reinforcement for the prototype, since it should be very predictable dimensionally. The process engineer has raised concerns about the part "moving" when heated to 90C for 10 minutes. My thoughts are if...
  13. ryandias

    Question on Surface Roughness Callout

    Is there a difference between the call-outs in the image?
  14. ryandias

    Basic Dimensions

    Are the two examples in the attached image equal? If X + Y = Z?
  15. ryandias

    Design for Transfer Molding

    I have been asked to do some concepts for a "transfer molded" package. I am not that familiar with the constraints on such a process. Mainly can lead frames extend out vertically in the mold (into the mold cavity), or do they always have to be flat against the parting line? Anyone have...
  16. ryandias

    Design for Tranfer Molding.

    I am a designer electronic systems, and have been asked to do some concepts for a "transfer molded" package. I am not that familiar with the constraints on such a process. Mainly can lead frames extend out vertically in the mold, or do they always have to be flat against the parting line...
  17. ryandias

    P.O.I. reference - What does it mean?

    I see in a few places the term " P.O.I" What does it mean? Occurrence is: 18.90 P.O.I. 2 PLCS Point of Interest??
  18. ryandias

    Cost comparison - Pa66 30GF vs. PBT 30GF

    Can anyone give me a price comparison for the two materials? I see both are Medium ish prices, but is one more expensive in general?
  19. ryandias

    What computer are you running ST2 on?

    I was asked to spec a new computer for myself so I can allocate my existing Lenovo to a student. I looked at a Lenovo workstation, S20 Intel Xeon W3520 (2,66GHz) Windows 7 pro 64bit (OS) Nvidia Quadro FX 580 32 core (video card) 6 GB ram (upgradable) Siemens site seems quite useless as to what...
  20. ryandias

    How is this (Heatsink) Manufactured?

    See attached image: There seems to be little to no draft on the pins which leads me to believe it is not a die casting process. Is it a post mold welding process? Can anyone enlighten me?

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