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Recent content by mabn

  1. mabn

    Engineer goes to Law School

    Does your scholarship cover part-time schooling as well? Just asking as many scholarships require a full course load.
  2. mabn

    Caterpillar 225 Specifications

    I beleive the 225 hydraulic excavator stopped being built in 1991. The new version, would be a 325... but it is over twice the weight, and quite a bit more horsepower. The 322 would be closer to the horsepower of the 225, but the weight is still about twice that of the 225. There are also a...
  3. mabn

    Masters Degrees (Structural/Geotechnical)

    If Canada is of interest to you, the University of Alberta has a world-renowned geo-technical engineering research department... not as hot on the structural side though. Also, there is currently a huge tunneling project going on right on campus. The city's underground transit train ends on...
  4. mabn

    Cranfield University (UK) says engineers in short supply...

    Rugged, The company I work for has a few sales engineers. They provide enineering services to help sell the product. Often, the position involves data analysis of physical properties; research liasons with the customer's research departments and university research areas; design work of the...
  5. mabn

    Economics Question: Capital Expenditure

    In mining we break the cost of ownership into two categories, owning and operating costs. Operating costs taking into consideration all the points that IRstuff brought up. Plus, you can consider inputs that must be purchased in order to operate the equipment. For example, your car at home...
  6. mabn

    Metric II

    I assume you mean 100's of imperial threads.... equalling roughly 115 metric threads.
  7. mabn

    Global Warming

    We just need a little more journalistic integretiy in the Western world. Technical issues aren't the only area of concern either. Also, I'm not trying to generalize the entire profession. Just some bad apples.
  8. mabn

    Dozers towing Haul Trucks

    DTGT2002, These are off-highway trucks. We have the widest tires we can fit on them as technology allows. Executnr, We've developed a solution, but your input would be helpful and appreciated. I had setup the following relationship: Usable Pull > Rimpull > Effective Resistance Usable Pull...
  9. mabn

    Dozers towing Haul Trucks

    Thanks for the clarification KRS. Just used donkey and cart for illusrative purposes.... which isn't all that illustrative when I think about it... unless the cart had a small engine in it and the donkey was just helping the cart through some rough stuff.
  10. mabn

    Dozers towing Haul Trucks

    KRSServices, We are examining the possibility of increasing the payload of the trucks by having a tractor (dozer) pull the trucks at the front. We are examining large scale machines, but I hope the physical principles remain the same regardless if you were using a donkey and a cart.
  11. mabn

    Dozers towing Haul Trucks

    Grouser, Good idea... a staging area would make a decent plan, except we are looking at 5000-8000 tons of material coming off of a face every hour. There are massive bucket wheel type excavators available that would accomplish just the thing you are talking about, at the production rates we...
  12. mabn

    Dozers towing Haul Trucks

    Thank you for all the input so far, it's helping me to clarify the problem. Like DRC1 says, we can't really push the trucks because the dozer would likely damage the tires or the frame of the machine... sort of out of design specs. We haven't examined the geo-textile fabric with gravel, but I...
  13. mabn

    Dozers towing Haul Trucks

    Hello fellow earthmovers, I'm hoping to glean off some expertise if anyone has experience with the following: We have a problem with haul trucks getting stuck in soft material.... or their tires spinning out as the truck starts up in the soft material at the loading area. We have limited the...
  14. mabn

    Products that prick your conscience

    We are talking about certain industries that are driven by customer/consumer wants and desires. Who creates those desires? Society isn't full of level headed engineers, most of the population can be persuaded, and with billions of dollars sunk into psycologists turned marketers, desires are...
  15. mabn

    Estimating truck yardage to placed yardage

    If you can measure strut pressures on the trucks before and after loading, some sort of sensor tied to the ECM and the ability to download or monitor the values going in, you should be able to get a pretty accurate weight measurement. It would be nice if these low cost sensors were an industry...
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