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  1. GMIracing

    News from California

    That is a really promising study CastMetal, thanks for sharing. It looks like coal does have much potential for being a clean way to meet our future energy needs. It is also a good point that my assumption was using our current average emission rates, and I do expect that these will improve...
  2. GMIracing

    News from California

    Really? Coal is cleaner than gasoline? Are you sure that an EV charged 100% by a coal fired power plant will be cleaner than a modern Tier2 Bin5 compliant vehicle? If we estimate that an EV requires 0.25 kW/mile, and ignoring all transmission and charging losses, I figure this is roughly...
  3. GMIracing

    ISO 8015

    DIN 7167:1987 - Relationship between tolerances of size, form, and parallelism; envelope requirement without individual indication on the drawing. my take after reading this standard: if the drawing is based on DIN standards and contains no reference to ISO 8015, then the envelope requirement...
  4. GMIracing

    Engineering Graphics and Drawing

    Out of curiosity's sake I looked at the current course catalog from my old Uni: MECH-100 Engineering Graphical Communication This computer aided design and drafting course is an introduction to engineering graphics and visualization with topics to include sketching, line drawing, wire-frame...
  5. GMIracing

    Heavy machinery design text book

    I recommend a copy of: "Machine Design for Mobile and Industrial Applications" by Gary W. Krutz, John K. Schueller, Paul W. Claar, II table of contents https://engineering.purdue.edu/~krutz/book.html I refer to mine often. Used copies can be found quite easily and are relatively inexpensive.
  6. GMIracing

    minus minus tolerance

    The +/+ and -/- are typically used with fitting cylindrical parts to one another using the following types: • RC = Running or Sliding Clearance Fit • LC = Locational Clearance Fit • LT = Transition Clearance or Interference Fit • LN = Locational Interference Fit • FN = Force or Shrink Fit see...
  7. GMIracing

    ASME vs. ISO

    Also, I have never found composite profile tolerance shown, stated, or explained anywhere in the ISO specifications for geometrical tolerances. I think this is a very important tolerancing tool that they are missing.
  8. GMIracing

    ASME vs. ISO

    One of the biggest differences I found between ASTM-1994 and ISO is Concentricity and Symmetry. The only similarity is the symbol that used on the drawing. This is just one of the many existing differences that has cause many issues for me, in addition to the envelope principle already stated...
  9. GMIracing

    3D Softwear for Engine Fit-Up

    I think the ideal solution would be a CMM creating simplified 3d models of the interfaces and common componets, 3d modeling software to create the new parts, with all of the final work fed directly into CNC manufacturing methods. This of course comes at a high initial cost for the software and...
  10. GMIracing

    Propshaft strength ?

    PGCobra, Sorry for not getting back to your questions till now, and most likely you are already past the start of your manufacturing phase. As Fabrico said, modern Torque Converters can multiply torque many times over. I know of some companies that have production units over 3x torque...
  11. GMIracing

    Drilling Torque Converter for Drain Plug

    On a sealed Torque Converter, the risk of contaminating the Converter with debris from the drilling process greatly outweighs any benefit that the drain plug will ever have.
  12. GMIracing

    European Steel Standards

    Stahlschlüssel (Key to Steel) "The new 21st edition of the Key to Steel includes more than 60,000 standard designations and trade names from approximately 300 steelmakers and suppliers. Presentation is trilingual: English, French, and German. Materials covered include structural steels, tool...
  13. GMIracing

    GD&T and manufacturing process

    I agree with ctopher, tolerances should be based on fit, form, and function. Make the tolerances as large as possible, but no larger. Tolerances should be used to ensure the parts fit together, maintain clearance/distance from other parts of the assembly, and that everything functions.
  14. GMIracing

    GD&T (GPS) per ISO 1101, 8015, & 2768

    Thanks everyone for sharing your experiences. I find little comfort in knowing that I have not been alone in finding problems with this ISO 2768 General Tolerance. I also find myself getting a little wound up any time this standard is mentioned or referenced, and being the only EU foreigner in...
  15. GMIracing

    Propshaft strength ?

    I am not quite confident in your loading inputs: 600 ft-lbs ("your" stated engine torque) x 2 (TC stall ratio) x 2.48 (trans 1st gear ratio) = >2900 ft-lbs as for impact loading, the Torque Converter should absorb a good portion of any shock loading that is subjected to the system apon...
  16. GMIracing

    Driveshaft Angular Acceleration

    quote: "The SAE handbook recommends some limits. 1000 rad/s for passcar and 2000 rad/s for large truck." rad/s is the unit for Rotational (angular) Velocity. Acceleration is rad/s^2 and is the rate at which the shaft increases rotational velocity. For the same input force, more inertia will...
  17. GMIracing

    GD&T (GPS) per ISO 1101, 8015, & 2768

    Thanks for your input KENAT and dgallup, I really appreciate it. First, you are right dgallup. The training video I watched happened to combined the two standards into one short segement, but I now realize that I obviously misunderstood what they were trying to clarify and to which standard...
  18. GMIracing

    GD&T (GPS) per ISO 1101, 8015, & 2768

    old threads for crossreference: "What is the differences between ASME Y14.5M and ISO 1011 ???" http://www.eng-tips.com/viewthread.cfm?qid=176019 "Tolerance analysis ISO2768" http://www.eng-tips.com/viewthread.cfm?qid=196260 "tolerance analysis to ISO 8015 & 2768 part 1 (again!)"...
  19. GMIracing

    GD&T (GPS) per ISO 1101, 8015, & 2768

    I realize that this has been discussed here a few times before, but I could use some additional help. Working for a very global oriented company, we use ISO for all Global Dimensioning and Tolerancing standards for our drawings. After receiving training per the ASME Y14.5 standard, it has been...
  20. GMIracing

    Books

    ASM Handbook Volume 14B, Metalworking: Sheet Forming

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