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  • Users: gruntguru
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  1. gruntguru

    How to work-harden Stainless Steel

    I have designed a beam element to use as a flexure. Needs to be stainless steel for several reasons. Dimensions are 255 x 12 x 8 mm (approx 10" x 1/2" x 5/16"). They will be profile cut from 8mm plate. These are spring elements and need to operate beyond the elastic limit of the as-delivered...
  2. gruntguru

    Telescopic Strut.

    I am looking for a telescopic strut for a marine application (think camera tripod or monopod). I need it to collapse to 800mm or less and extend to 1800mm. Max load is 100 kg axial. Problem with available tripods they all seem to have friction locking only. I need positive locking (pins...
  3. gruntguru

    High force quick-release

    I am designing a drop-tower impact tester, but also toying with a horizontal sled alternative (powered by an air bag). Either way, I am going to need a release mechanism capable of instantly releasing a 300kg mass (in the drop-tower case), or up to 10,000kg (100kN) of preload in the airbag case...
  4. gruntguru

    Using a VFD to load a genset.

    I am looking for some advice on the above topic. We have an ABB regen drive (ACS800-11-0016-3) 15 kW and want to use it (in regen mode) to load a 3 phase diesel genset (18 kVA Cat/Olympian). We have had negative responses from ABB tech-help and a consultant. What issues can you see and what...
  5. gruntguru

    High velocity air cylinder

    Not sure if I am in the right forum but here goes. I need to accelerate a 300kg mass to 8m/s in 1m or less. This is an infrequent operation with plenty of recovery time between firings. With 10 bar air pressure this would require a 160mm diameter cylinder, so with losses a 200mm cylinder should...

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