Double Part Thimble Eye
Double Part Basket
Grommet Round
Application for Grommat
Grommat slings can be fabricated in very short circumstances. The reason is this: Grommat slings are made from one continuous length of strand or wire rope. This requires only one tuck-in point as compared with six tuck-in points needed manufacturer an endless sling.
A Grommat consists of an endless rope having construction 6/1 construction & is used where high ultimate breaking strength of the rope is required beyond the limits of a single part rope.
A strand of sufficient length to complete the Grommat shall be obtained by either of the following methods:
Method A: An order strand shall be unlaid from a specimen of 6/1 rope conforming to the requirement of the customer.
Method B: Unlaying from a specimen of 6/4 rope having strands in all respects equipment to those obtained by method A above.
Method C: Using a virgin strand either prefromed or post formed & in all other respects equivalent to those obtained by method A & B.
During the course of construction of a Grommat the performed lay of the strand shall be maintained and shall not be interfered with except when laying in the core for which purpose length of strand left to form the core should be straightened .
The length of the strand required to form a Grommat shall be equal to about 7.5 times the parameter of the Grommat in case of spliced Grommat. But in case of complete streamline splicing length shall be 4 times the effective length.
Butt Splice
The two ends of the rope should be joined together by two five –tuck splices.
Number of Tucks
The splices shall be tucked three times the full size of strand, a fourth time with the strand each reduced to half the original number and a fifth with the strands each further reduced to one third the original number. The heart strand is to be rowed in during tucking so that a double heart is produced for at least the length of the first three tucks in both directions.
Method of Tucking
The Tucks of the Splice shall be made over one strand and under one strand against the lay of the rope. The heart strand of the rope shall not be removed when the strands are opened out for tucking, but may be cut to a suitable length.
Finishing
The ends of the splice in way of the twisted off ends of wire that is between the end and the third tuck shall be tightly served with seizing wire, after parcelling with canvas, Hessian or wax paper.
