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Recent content by wroberts

  1. wroberts

    How do I edit existing GD&T symbols?

    Right click, Pick from list, select the gd&t from the list then select it again. No its not obvious but never found anything in Pro-E that was.
  2. wroberts

    A356-T6 Aging at elevated temperatures

    I'm working with A356-T6 Al that has a normal operating temp of 100 degrees C but can go up to 200 degrees C for at most 10 minutes at a shot. My ASM Book Aluminum Alloy Castings Properties, Processes and Applications book has a table (D4.26) that shows 356-T6 material properties at elevated...
  3. wroberts

    Chemical Rust Removers?

    You can also use Hydrocloric acid with a 3% solution of "PavPrep" http://www.pavco.com/index2.htm. It's some kind of alcohol based liquid. It keeps the acid from eating the metal. I used to work for them and used it, in small amounts, to clean up and restore old motorcycles. You can...
  4. wroberts

    Is 3D REALLY better for mold design?

    SW has a really nice 2D package, why buy/use two packages? You lose the fact that anytime you change the 3D the 2D doesn't automatically update. You can also change things in 2D laylouts that will translate automatically to 3D. 3D and linked 2D drawings are the way to go. Will
  5. wroberts

    Briggs and Stratton engines.....aluminum bores?

    I've dismantled and rebuilt a lot of Briggs over the years, I've never ran into one that didn't, but I rarely rebuild any that less than 10 years old. Heres the official line from from briggs. All engine models named Vanguard, I/C, Industrial Plus, Diamond Plus, Intek Edge, Intek Pro, ELS...
  6. wroberts

    Briggs and Stratton engines.....aluminum bores?

    Are you sure? Briggs have a metal liner for the cylinder bore and an aluminun housing poured around them. Just like your modern aluminum car engines. They've changed from the original design in that you can't remove the cylinder bore from the crankcase, its all one piece. As far as the plating...
  7. wroberts

    Which calculator is best.

    The TI has the Eigen Value stuff built in to. The only advantage to any HP calc is I've seen cards with equation sets for each disipline, something I haven't seen TI offer not you can't download other peoples equation programs to your TI. I personally hate the Reverse Polish Notation (RPN) I...
  8. wroberts

    Which calculator is best.

    My vote goes for the TI 89. You'll need EigenValues/Vectors for some of your classes, it does them. You can download programs to do LaPlace Transforms!, HP won't do that. There has never been any problem I couldn't handle using my 89. When i took a graduate bearing design class it did everything...
  9. wroberts

    Head bolts won't come loose

    Well I think they are. The trend these days seems to be 100K powetrain warrenties, (Crysler, Kia, ect...) Engine problems, valve train, head gaskets, ect.. should be covered by the powertrain warrenty. You the consumer don't pay for it the manufacturer does. Obviously this assumes there is...
  10. wroberts

    Head bolts won't come loose

    Glad to hear of someone else thats into old stuff and good experience. I've never heard of the nail polish trick be fore I'll have to keep that in mind. I understand that there are many cases where your stuck with a steel bolt into an aluminum housing, but as you said a penny or 2 of anti-seize...
  11. wroberts

    IDEAS 9

    I-Deas 9.0 is not supported on Windows XP, you will get no help from SDRC, or PLM/whatever if you run Windows XP and I-Deas together. VERY BAD IDEA. Will
  12. wroberts

    Head bolts won't come loose

    The way I wanted to fasten them in was with bolts, instead of a boss on the housing with threads. This was the way they were originally designed. The boss was a cost save that saved $0.04. While it cost almost nothing for the boss the housing then had to have the threads machined in. The volume...
  13. wroberts

    Head bolts won't come loose

    The reason that things like this get designed is that most engineers have never worked on anything old, or took wood or metal shop in high school. When I was in school, I was the only one of the mechanical engineers that took shop in high school, and had actually worked on anything that wasn't...
  14. wroberts

    Don't know what to major in??

    If you want to get a job designing any kind of auto parts, you need an ME degree. BA min, MA prefered. Ya ME is a broad major, but it's way more than Thermo and Fluids. You have your kinematics, Vibrations, Machine Design classes, Gears, Bearings, Clutches, Brakes, Springs, Stress Analysis...
  15. wroberts

    Engine Block Question

    While I am all for the Iron block. I would like like to point out some advantages of Aluminum. The manufacturing process for Iron is Dirty, Hot, bad on your body and equipment. Trust me I've worked in an Iron foundry producing Truck Blocks. It's shear hell. Iron needs to be produced on site...
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