FREQUENTLY ASKED QUESTIONS
Below is a list of some Frequently Asked Questions about our products. If you have questions about our products, please scroll through this list to see if they are answered. If not, please contact a customer service representative at (920) 722-0101, or use our Online Contact Form.
Can we mount our jib differently?
How critical is level and how accurate does plumb have to be with your floor mounted jib canes?
How often is concrete poured accurate enough to merit not using a mortar bed? Or should it be standard practice to use a mortar bed?
What additional items do I need to mount the jib?
What are the bolt/nut torque requirements for Contrx supplied hardware?
3/4″ Mild Steel anchor bolts/nuts or GR2: 150 ft-lbs. max
3/8″ Grade 5 bolts/nuts: 20 ft-lbs.
1/2″ Grade 5 bolts/nuts 50 ft-lbs.
5/8″ Grade 5 bolts/nuts 100 ft-lbs.
3/4″ Grade 5 bolts/nuts 175 ft-lbs.
1″ Grade 5 bolts/nuts 200 ft-lbs.
How are the jibs shipped?
Can I get a special jib?
Can I get the jib with motorized rotation?
What sort of electricity can I use to motorize my crane?
Is the jib available in different colors or finishes?
Can I use a jib outdoors?
What government or industry standards apply to these jibs?
Occupational Safety and Health administration, General Industry standards
American Institute of Steel Construction
Crane Manufacturers Association of America, Specifications no. 70 & 74
American Society of Mechanical Engineers/American National Standard ANSI B30
National Electric Code ANSI/NFPA 70
American Welding Society AWS-D14.1 & D1.1
What is the life expectancy of these jibs?
How fast can I get my jib?
Does the capacity include the hoist weight?
How much will a jib crane deflect?
Cumulative boom deflection, or the distance toward ground that a fully loaded jib crane boom will displace, is a function not only of the boom beam size and moment of inertia, but also of the total column deflection, flexure in the base plate, distortion of the upper head assembly, and the method of anchoring.
In order to accurately predict the amount of deflection possible in our product models, we randomly erect and test production units. Our empirical tests, coupled with static analyses of the units, indicate the following:
– For floor mount jib cranes with boom lengths of 10 feet or less, a cumulative deflection in the range of 3/4 to 2-1/4 inches can be expected.
– For floor mount jib cranes with boom lengths of 11 to 20 feet, a cumulative deflection in the range of 1-1/2 to 4 inches can be expected.