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  • Users: Christo_AU
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  1. Christo_AU

    V-Belt Wear

    Good day I am not very experienced with the design of powertrain parts and would appreciate any help. I have designed a v-belt and pulley assembly, please see the picture below. The load (platform lifted with screws) is normally driven by a servo motor. In case of a power failure, the...
  2. Christo_AU

    Off-road Truck Transport Vibration PSD

    Hi All I am designing a modified shipping container to be transported by truck on both asphalt and dirt roads. This is a defence job, so the design loads are typically obtained from MIL-STD-810. However, the off-road truck transport vibration PSD from 810 seems extremely conservative (Table...
  3. Christo_AU

    Ratio of torque required to raise versus lower screw jack

    Hi All Some help please. Does anyone know how to calculate the torque required to lower a load with a screw jack? Plenty of formulas available for raising it. Or even a formula to calculate the ratio of torque required for raising versus lowering? I think these values will not differ by much...
  4. Christo_AU

    Machined Screw Strength and Hardness

    Some help please with a newbie question. If I machine a big screw, will it retain it's strength and hardness? Does it have the rated strength and hardness throughout it's thickness or is it softer in the centre? For example: Using a lathe, I turn down an M20 bolt to have a shoulder with an M10...
  5. Christo_AU

    Grinding hide small cracks?

    Hi All. I am investigating damage done to some steel brackets which connect a shipping container to four screw jacks used to level it. I have never been involved with the investigation of damaged steelwork before. I want to confirm that there are no cracks at the welds using dye penetrant...
  6. Christo_AU

    Fuel Tank Stainless or Alum

    Hi All. We have to fabricate a 200 litre (50 gallon) fuel tank that will be underslung a trailer. This fuel is not for the truck, it is for a generator mounted on the trailer. Someone told me that it is better to fabricate it from alum sheet, because they said stainless steel sheet will crack...

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