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  1. bucknast

    Powering Commercial Refrigeration Unit With Solar

    Hey there, Working on a project where we need to cool a shipping container down to 50 deg F and hold it there for long periods of time. Container will be outdoors under a sunshade where solar panels will be mounted. The goal is to power the refrigeration unit with a solar system with energy...
  2. bucknast

    True Position of Hole Pattern on 3D Curved Surface

    How would you call this out on the drawing?
  3. bucknast

    True Position of Hole Pattern on 3D Curved Surface

    Hey all, So I have a program for a panel cover, and the customer supplied drawing calls out hole pattern, with true position to A/B/C, and A/B/C are established from datum targets derived from the points at the intersection of the axis of some of the holes and the nominal surface of the part...
  4. bucknast

    Datum Tag on Feature

    Hi, I'm hoping ya'll can help me. I've been looking around various sites for a while, and can't seem to find a simple way to create a datum tag on a feature, in this case, the outer diameter of an injection molded part. I want to tag the OD similar to the way shown in the attached image. Right...
  5. bucknast

    Simulating Arched Piece on Ground

    I have a board, approx 32" long and 8" wide, bent so the ends are ~3" off the ground. The curve is constant so it's tangent to the ground in the middle. I'm loading it using two surfaces on the top of the board as an analog to a person's feet positioned at the ends of the board. The issue...
  6. bucknast

    Simulating Arched Piece on Ground

    Hi, I'm trying to simulate a part that has a slight but constant and symmetrical arch to it, that's meant to be stood on by a person, somewhat like a skateboard with a constant bend, that's touching the ground at the tangential point in the middle. How can I best simulate the interface with...
  7. bucknast

    PTC Heating Element

    I'm looking for some information on the equilibrium temperature of PTC heaters as a function of input voltage. How does the transition temperature change with voltage? or does it? Thanks.
  8. bucknast

    Trouble with exploded view in drawings creo parametric 2.0

    I have an assembly I'm trying to make an exploded view drawing for, but it keeps reverting to the regular state in the drawing after I edit anything. I put the components in the desired position in exploded view mode using the edit position tool, but when I click the "explode components in...
  9. bucknast

    Simple Wire Barrier Deflection

    I'm review materials to be used for a mesh barrier with a cable or wire border that will handle most of the loading, it must span 96", be fixed at both ends at an equal height, and be able to resist deflecting more than 4" at midspan by a force acting there of 20 lbfs perpenticular to the wire...
  10. bucknast

    Brain Teasers

    I wasn't asking so I can be prepared with the answers, nor was I looking for a list of technical brain teasers, which are readily available on the internet. I wanted to know if any experienced engineers had come across an interview question they thought was particularly interesting, challenging...
  11. bucknast

    Brain Teasers

    I've got an interview with a company tomorrow that's notorious for asking difficult brain teasers. Do you have any such questions that you remember from any of your interview experiences?
  12. bucknast

    Measuring Runout of Two Internal Features

    Hi I'm looking for a way to measure the runout between two internal features on a small, radially symmetric part. We currently measure runout from the OD to the ID and from OD to a c’bore, but the performance of the part is determined primarily by the runout between the ID and c’bore. These...
  13. bucknast

    UTS & YS for 2014 Al and 7075 Al

    I'm looking for UTS and YS data on two types of post HT aluminum wire. Material #1: Aluminum 2014 wire Incoming state: H13, 35-40ksi UTS Heat Treat: Solution at 935 deg F for 50-60 mins, water quench, natural age at room temp for 96 hours Material #2: Aluminum 7075 wire Incoming state: H13...
  14. bucknast

    2014 Al heat treat question

    Hi everyone, I hope I'm in the right place for this. I'm new to this board, so bear with me. I'm having some performance testing issues with some parts I work with, and the failures seem to be related to the parts' heat treatment. I have a quick questions, and any assistance would be much...

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