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  1. atvargas

    Cranes and Composites

    Mikevv: Big Blue wasn't to blame for Miller Park collapse. Bill Lampson, president of the crane company said: I'm satisfied there was nothing wrong with the crane," Lampson said. "There was nothing wrong with the setup of the crane and nothing mechanically wrong." News accounts from the period...
  2. atvargas

    need to find an old SCR

    Dear Srs: I need to find an old SCR Nr. IE104X125 DA029 639 can anybody tell me where to look for it or where to find a substitute? Thanks
  3. atvargas

    VFD with a 3600 RPM motor

    JohnnieE: You can select a Yaskawa VFD. This kind of inverter will suit to your aplication very good. you can select a decelaration ramp from 1 to 60 sec and up. Motor must be equiped with a fan (TEFC Motor Type) or if possible attach a separated fan blower.
  4. atvargas

    Need Help Finding a Suitable VFD

    dfowler: Yaskawa is the chippest and the best drive for your aplication. This drive accepts 4-20 ma as an standard feature. Model CIMR-F7
  5. atvargas

    Wound Rotor Induction Motor

    tmcgett: Yes I repair two overhead cranes. These new cranes arrive to plant with a very high noise in motor hoists, in first and second step (five step each) but in 3 4 y 5th step operate normal. Silence. Motor hoists worked like a two phase condition and high amps in wound rotor. Then I review...
  6. atvargas

    VFD with a 3600 RPM motor

    JohnnieE: What kind of motor you will use? TENV, TEFC etc.? What are the cycles of work? as an example: 10 min work, 10 min rest or 10 min work 30 min rest? specify What is the average freq. of work period? What is the type of work? A pump, a mill, a hoist, a trolley? what type. Indicate
  7. atvargas

    how do we use the beam selection tables for cantilevers

    Tobman: recently I needed to do a jib crane then I calculate it as I found in Marks Manual (Mechanical Engineer)Page 5-30 Table 5.2.4. & Table 5.2.5 (Novena Edición en Español) these are the formulas: I found a practical method as follows: You need to calculate beam first like a member...
  8. atvargas

    electro hydraulic turn over machine 10 ton capacity

    I need to choose a turn over (upside - down) machine to turn a mould over 90° from upside position to down or down to upside. Muold weight is about 7 ton. I´m using to do this operation with a 30/5 ton overhead crane but there is a risk in this manner due to 5 ton hook maybe is handling more...
  9. atvargas

    dc speed variators

    I need to usbstitute and old dc speed controller 5 steps to operate a 15 hp series wound dc motor 550 VDC. 32 amp This is a hoist motor of an overhead crane. Can you recommend any brand of electronic dc speed variator cappable to do this? Any info will be very appreciated. Thanks ATVargas

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