The automatic back spot facing tool cuts down the expensive machine hours; avoid manual interruptions; makes the back spot operation cheaper and faster. This tool can be used in a drilling, boring and milling machines. It back spot faces without any manual interruption at any stage of its operation. Therefore, it is the ideally suited tool on machines with auto cycle and on machining centers.

CONSTRUCTION & FEATURES:-

Case hardened and ground shank prevents breakage due to torsion load and ensures high wear-resistance. Just enough clearance on the guiding pilot ensures a good guide, free entry and smooth rotation of the tool in the bore. Center clamping inserts are generally used for preventing the possibility of the insert slipping down during cutting. Most of the cutting load goes directly on the tool shank and not on the slender pivot points by ensuring the following:

1. Precise and co-axially jig-bored pivot bores,
2. Pivot pins with close fit
3. Blue matching of the wing seating for ensuring maximum area contact with the shank

SIZES & SPECIFICATIONS :-

An automatic back spot facing tool is generally tailor-made to suit a specific requirement. There are no standard sizes. To make an offer for the tool, pilot hole dia, corresponding back spot facing dia and holding shank specification are required. Tools with pilot Ø 7 mm onward upto Ø 12 mm are offered with solid HSS wings, having integral pivot pins. Wherever available standard carbide inserts are not suitable, solid HSS wings are used even in higher sizes. Normally, centre clamping type carbide inserts are used. Generally, the ratio of maximum back spot facing dia with respect to the corresponding pilot dia is 2:1. Since a back spot facing tool is normally custom-built, there is no general thumb rule for the back spot facing dia with respect to the corresponding pilot dia. The holding shank can be cylindrical (suitable for side lock holders), Morse taper, ISO, BT, and Metric, depending upon the machine spindle taper. An automatic back spot facing tool is meant for producing one specific back spot facing dia through one specified bore. Therefore, these tools are ideal for a large batch production or mass production.