FAQs

ONSITE MACHINING: FAQs

(Q-1): Is any machining operations possible on any equipments without dismantling?
(A-1): Yes, any machining operations can be carried out on any of your huge and heavy machineries and their parts, which are impossible and undesirable to dismantle.

(Q-2): Whether, any small machinery parts should be dismantled for such INSITU repairs?
(A-2): Generally, our portable equipments will be mounted on your machineries for repairs. In the process, if some of your small machinery parts interferes with the operation of our equipment, those alone need to be dismantled.

(Q-3): Whether INSITU machining will be done to good accuracy?
(A-3): Yes, INSITU machining will be done to standard permissible accuracies and tolerances.

(Q-4): Whether very big and heavy machineries can be handled by INSITU machining?
(A-4): Yes, machineries of any size and weight can be repaired by INSITU machining. We are equipped with attachments and fixtures to accommodate any size and weight.

(Q-5): What are the details that should be sent, if such problem comes up?
(A-5): Technical details giving dimensions, preferably a complete drawing indicating the area to be machined, should be sent to us.

CRANK - PIN GRINDING: FAQs

(Q-1): How will the repair of INSITU crank-pin grinding be done?
(A-1): INSITU grinding or undersizing of crank-pin will be carried out through the inspection door available on both sides of the engine block or entablature. Our tooling or honing head will be mounted around the crank-pin and driven to effect grinding. Hence, provision of inspection doors on either side is a must for these repairs.

(Q-2): Should the crank-shaft be dismantled for grinding?
(A-2): If only the crank-pin need to be ground or polished, the engine block or crank-shaft need not be dismantled. Only the piston and connecting rod of that chamber need to be dismantled. However, for polishing of main journals, the crank-shaft need to be dismantled and lifted from crank-case, to create recess around the journal for mounting of our attachments.

(Q-3): What range of diameters can be undersized?
(A-3): Any diameter of crank-pin from 75mm to 1500mm can be undersized with our INSITU crank-pin grinding machine.

(Q-4): How to judge, whether a crank-pin requires grinding or polishing.
(A-4): If, life of a particular crank-pin bearing is comparatively short, a complete calibration of crank-pin should be carried out to access the ovality. Ovality in excess may be one of the prime reasons for short bearing life apart from other defects such as scorings, dents or pittings. If the ovality is found to be in excess and crossed the maximum limit, that crank-pin needs grinding/polishing. If calibration is not possible, visual inspections for presence of scorings, dents or pittings may indicate the rise of ovality in crank-pin, beyond limit.

(Q-5): Upto what accuracy or tolerance, INSITU grinding can be done, say on a crank-pin diameter of 200mm and 500mm.
(A-5): INSITU crank-pin grinding can be done to the minimum permissible tolerance levels, that varies with diameter. Say for a dia of 200mm, the tolerance will be 0.03mm ovality and for a dia of 500mm, the tolerance will be 0.05 mm ovality. The surface will be finished to a fine finish of <0.025 microns.

(Q-6): What are the technical details that should be given, if such crank-pin grinding needs to be done?
(A-6): Following technical details should be sent to us: Engine make, KVA and RPM. Crank-pin diameter and width. Nature of Radius: Positive or Negative Size of windows on either side of engine frame or block. Type of damages like scoring, dentsor seizure. Diametrical sizes, if the crank-pin has been calibrated.

METAL-STITCHING: FAQs

(Q-1): How reliable is Metal-stitch, compared to other repair process such as welding?
(A-1): Metal-stitch, compared to welding, is the best and reliable solution for the repair of cracked, blown-out components. Unlike welding, by which thermal stress is induced, Metal-stitch is a cold, mechanical process of repairs for cast-iron, cast steel and aluminium casing, huge or small.

(Q-2): what are the advantages of 'Metal-STITCH'?
(A-2): The advantages of Metal-stitch are numerous. Some of them are as follows: Saves time and money as the repairs can be done on the spot. Guaranteed and reliable process of repair for cracks and breakages against welding. Requires minimum dismantling of parts. The repaired area will be as good as new. Fast, economical and proven solution for repairs of cracks, thus avoiding replacement costs.