The Necked Down Feature
When a small diameter boring bar is needed within a large O.D. boring bar sleeve we found it practical and necessary to reduce the outside diameter of the boring bar sleeve to allow the coolant coming from the turret would not be deflected by the sleeve but could be directed into the hole along the boring bar. You will realize another advantage in using our necked down design boring bar sleeve when it comes to boring a hole which is preceded by a counterbore. Here, the boring bar has to extend only far enough to finish the bore and the neck of the boring bar sleeve can enter the counterbore and give the boring bar as much support as possible. The necked down feature is unique to MTA.
90° Spacing Between Flats and Set Screws
This arrangement will enable you to position the boring bar within the sleeve and the sleeve within the turret for best results. This choice is very important, since sometimes a boring bar works better when clamped on the top; other times it works better when clamped on the side or bottom. In any case, you will always have a three (3) line clamping (the line formed by the two sets of set screws and the opposite side of the boring bar sleeve bore).
Our boring bar sleeves are heat treated to give you toughness, wear resistance and years of dependability under the most demanding service.