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  1. BrysonRD

    -100, -300, and -500 Drawing Levels

    I don't actually have a sheet metal part at the moment. That was just an example--maybe a bad one. It seems to be an industry acceptable "standard," but I can't find any documentation about it. The attached image is from a Lockheed drawing. The 301 and 501 assemblies would not be in the ERP...
  2. BrysonRD

    -100, -300, and -500 Drawing Levels

    Thanks, but this isn't what I'm looking for. We use intelligent part numbers already. I'm wondering about the method of using different levels within a single drawing for sub-components or sub-assemblies. It allows for a way to reference an interim item that doesn't have a part number that is...
  3. BrysonRD

    -100, -300, and -500 Drawing Levels

    I used to see drawings with -100 level sub-assemblies that fed into -300 level sub-assemblies which in turn fed into -500 level sub-assemblies. It seems like these were on Boeing and Northrop drawings, so maybe it's more of an aerospace industry practice. I've tried searching for this using...
  4. BrysonRD

    ASTM B841 (RoHS Compliance)

    I'm not sure if this is the correct forum for this, but here goes. To know if a particular plating is RoHS compliant, I usually look for something like non hexavalent, trivalent, or RoHS. For instance ASTM B633 Types V and VI use a non hexavalent coating. I'm wondering about ASTM B841 though. I...
  5. BrysonRD

    Calculating air temperature change in a closed system

    Thank you Snickster. I'll dig more into HVAC systems and the equation you shared. I appreciate it. Bryson
  6. BrysonRD

    Calculating air temperature change in a closed system

    Okay, I see I may have left out some important details. Thank you for the replies. I'm also sharing what I know without sharing exact values so as not to cloud the issue. It's a container with some electrical equipment inside that produces a certain amount of heat (in BTU). The container has...
  7. BrysonRD

    Calculating air temperature change in a closed system

    I'm working with a client and I need to calculate the change in temperature of an enclosed volume. I know the volume, ambient temperature, and heat added to the system (in BTUs). Can someone point me to the correct equation(s) to calculate the increase in temperature? What information am I...
  8. BrysonRD

    Welding and Re-machining Cast Iron

    I wanted to let you all know how much I appreciate your input. Unfortunately, I can't really give any more details at the moment. My client hasn't shared any more details with me, and his customer is the military, so I wouldn't be able to share more anyway. Thank you all.
  9. BrysonRD

    Welding and Re-machining Cast Iron

    Unfortunately, I haven't been able to get a lot of details from my client about where the issue is. Here's what I know: - It's gray cast iron - It's a brand new casting in good condition - The problem area is some sort of protrusion (not a planer surface) - The protrusion is...
  10. BrysonRD

    Welding and Re-machining Cast Iron

    I have a client that has received several cast iron pieces from a vendor that are slightly undersize in one location. I understand that a good weld can be stronger than the base material itself. Is it a generally accepted practice to weld or braze gray cast iron, and then possibly machine or...
  11. BrysonRD

    GD&T Dual Tolerance

    Thanks for the link and the input Dave. The original drawing of the part I'm revising actually uses a note. I was just trying to see if there was a more concise way to go about it, but I will probably stick with that. I actually did a bit of GD&T research (outside of SW). So far I haven't been...
  12. BrysonRD

    GD&T Dual Tolerance

    I've been on this site a couple times before and have decided to make a profile, so this is my first post. I'm also a fairly new engineer, so please excuse my ignorance. I tried searching the forums for this topic and didn't find anything, so hopefully I'm not duplicating any threads. The...

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