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BULLNOSING & CRANKING

 

CRANKING OF PROFILED SHEETING

Cranking of a profiled sheet incorporates lateral rib castellations pressed in at uniform distances which vary according to the radius requirements.

Cranked sheets can be supplied in standard radii as follows:

When ordering cranked sheets, details should be given using our standard information sheet. Please contact the Technical Department
at your nearest branch.

NOTE 1
Negative (reverse) Cranking on Saflok® cannot be performed due to the nature of the profile.

EXPANSION
It should be noted that Aluminium has an expansion co-efficient which is twice that of conventional steel substrates. If the sheet is to be bullnosed on one end, then expansion must be allowed for in the opposite direction. With the use of Saflok 700® this problem is reduced due to the fact that the profile will slide on the clip.

NOTE 2
Profiles can be cranked in 275 & 550 MPa material.

STANDARD CRANK
Standard cranking is normally with the narrow flute uppermost and the bend away from the angular inclination.
REVERSE CRANK
Reverse cranking is normally with the narrow flute downward and the bend into the narrow flute. Applies to pierced fix profiles only.
DIFFERENT TYPES OF BULLNOSING AND CRANKING

These drawings show the various types of bullnosing and cranking available on Safintra sheeting. Before production may commence, we will require a detailed drawing giving all the required data, and duly authorised by the customer.

NOTE 3
θ = Arch Angle
0 = Centre of the circle
R = Equal to radius (½ diameter)

NOTE 4
During installation, clean the roof daily by removing all swarf, pop rivets and unused fasteners or any other debris.