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  • Users: bsmet95
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  1. bsmet95

    Electrically insulated hoist hook.

    I have an application for a hoist with an electrically insulated hook. This has been done several times, with a typical assembly shown in the layout. The insulating material is Garolite, and I've included a list which includes electrical properties. On this particular application I need to...
  2. bsmet95

    Changing from DC motor to an AC motor.

    My understanding of DC motors is very limited. A user has a 30 year-old hoist with a 10HP DC motor. He'd like to change to AC. I've done some research and among other things have noted that torque characteristics are different. Is there a way to determine an AC motor to use for roughly...
  3. bsmet95

    Seismic considerations for monorail beam.

    My company manufactures patented track monorails and cranes. A customer has a rather unusual request for some calculations. Our track is to be installed in a building in a seismic zone, and in case of seismic activity he wants the track to fail before the building does. According to ANSI...
  4. bsmet95

    Estimating fatigue on monorail track

    My company manufactures cranes and monorails using patented track. One of our installations has thousands of feet of track and hundreds of 2-wheel trolleys. See the attachment. The customer wants numbers on fatigue of the track. We know the wheel loading and number of trolleys per day which...
  5. bsmet95

    Wear of Hardened Roller on Track

    My company manufactures monorail type cranes and carriers using proprietary patented track. Some of our trolleys (carriers) have side guide rollers, See the attachment. We have a situation in which we are getting an unusual amount of wear on the guide rollers. two trolleys are tied together with...
  6. bsmet95

    Spring lock washer vs. internal tooth lock washer.

    My company manufactures bridge crane and monorail systems. We have a current field issue in which the screw holding a trolley wheel keeps loosening. The screw is locked in place with an internal tooth lock washer, as shown in the illustration. The end user has asked for a torque value for this...
  7. bsmet95

    Hub diameter for a drive tire

    My company designs and builds underhung cranes and monorail systems. One of our product lines is a monorail tractor with a 16" dia. poly drive tire. See the attachment. The standard bores for this tire are 1.250", 1.438", and 1.625". There may be a case due to HP that a 1.938" dia. bore is...
  8. bsmet95

    Clamping Monorail Beam to Building Steel

    My company manufactures patented track crane and monorail systems. Sometimes the track must be flush clamped to the building steel, and the attached sketch is a sample of one of our lowest capacity clamps. The clamp, for example, may be rated for 10,000#, but depending on the hanger centers...
  9. bsmet95

    Effect of Spring Pin thru Heavy Hex Nut

    We are installing a monorail system with track switches. The switches will be hung with rods and braced against lateral movement. A hanger fitting will be used at each mounting point, with the rod and nuts as shown. Is there any problem with drilling thru the nut and inserting a pin...
  10. bsmet95

    Bolt loads for beam rigidly connected to overhead support

    I must support a load with a beam as per the attachment. There are two pairs of bolts at each end. This appears to be a statically indeterminate situation for bolt reaction calc's. is there a way to determine or estimate the tensile load in each pair of bolts...
  11. bsmet95

    A36 steel in sub-zero temperatures

    My company produces patented track monorail systems, the track being a proprietary steel bottom flange 3.33" wide welded to A36 web and top flange plates. We have a customer inquiry for a monorail to be used in -33 F. Is there info on the suitability of steel for this temperature?
  12. bsmet95

    Seismic calc's. - Zone vs. Design Category question

    My company designs and builds patented track underhung bridge cranes & runways, as well as underhung wire rope hoists. Occasionally a customer requires seismic calc's. for an installation. I have done calc's. for Zone 4 applications, but this customer specifies Design Category 3. A zone was not...
  13. bsmet95

    Effects of vertical upward force on bottom flange of suspended beam.

    Good morning. My company designs and builds hoists and underhung bridge cranes. I am working on a proposal for a bridge crane with an extending beam application. See the attachment. The hoist can pick the load at the extended position, and the bridge crane can travel with the beam and hoist...
  14. bsmet95

    Cantilever Deflection Question

    I am an engineer for a crane and hoist manufacturer and at times we must design a bridge crane with a long overhang, which may have multiple loads. Is there any way to calculate deflection? I haven't found anything in Machinery's Handbook or other places...
  15. bsmet95

    Recommended material for sliding application

    My company processes A36 steel beams, cutting to length and drilling the webs and flanges. This is done with a programmable cutting/drilling machine. The beams are lying on their sides and being dragged thru the machine. The problem is that the slide bars are made of a semi-hard plastic, and the...
  16. bsmet95

    calculating circular ring loading

    I must design a rotating device to support a load of 22,000 lb., as shown in the attachment. The device is about 100 inches diameter, is supported on two rollers, and will rotate at 2 RPM for 110 degrees each way. The load is supported on the trapezoid shaped frame within the ring. The closest...
  17. bsmet95

    Spline stress analysis question

    I have been asked to recheck the calc's. on a spline which has failed. I have the notes from the designer, who is no longer with the company, but the sources for some of the calc's. have not been noted. I've been searching our library but available info on splines is very low. Can someone point...
  18. bsmet95

    gripping pad material inquiry

    My company builds a variety of lifting machinery, including below-the-hook lifters. I'm designing a grab to lift 4-ton aluminum coils on the I.D. and O.D. See the attachment. Normally we use a polymer gripping pad but the current customer has asked for a material which will absorb oil so as not...
  19. bsmet95

    calculating hanger loads of a monorail curve

    I have an application for a 4-wheel articulating trolley operating on a monorail with a 90 degree curve with short tangents, with hangers at the ends of the tangents and one at 45 degrees. See the attachment. Another engineer and I have a disagreement over how to calculate reactions. Our common...
  20. bsmet95

    torsional buckling of a column with jib crane

    I've been asked to look at the feasibility of mounting a 1-ton jib crane to an existing column. The column is a w10x49#, approx. 35 feet floor to roof, braced in X- and Y-axes at the top. In addition to eccentric loading, as the jib rotates, torsion will be induced in the column. AISC spec E4...

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