INTRODUCTION
New machining techniques require new Tools, which in turn lead to new machining methods. This constant interaction is the driving force which ultimately leads to progress. It is this very factor that leads to continuous development of tools and machine tools. |
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The increasing use of NC-Controlled machines, particularly machining centres, have brought a further need for tool development which will allow new methods of increasing performance to full advantage. This need is now met by BOBAR manufactured by SUPER SURFACE TOOLS COMPANY, BOMBAY, INDIA. |
HIGHLIGHTS
a) | Blade with appropriate cutting edge geometry. The guide pads are positioned to absorb and utilize the radial and tangential force. Hence, overall effect is an efficient material removal and size-control of the bore. |
b) | Axial parallelism and ovality is within 1 to 3 Micron and is maintained over the entire bore length. Same accuracy is obtained and broken and interrupted bores with extended guide pads. |
c) | Minimum surface irregularity is achieved by providing 3° finishing lead angle on blades. |
d) | Guide pads while controlling the cutting edge, burnish the whole surface by exerting a counter force to the cutting action. |
e) | The only wearing part in 'BOBAR' is the Blade. This blade can be used from the both sides, Resharpened & Replaced. |
f) | The guide pads require a constant lubricant film for longer life. Any commercial coolant emulsion (1:9 mixture) serves the purpose. |
g) | Stock removal: 'BOBAR' reams in a straight line and does not follow the pre-machined bore. For good allround finish, stock removal should be 0.15 mm i.e. 0.3 mm on dia. |
h) | Cutting Speed: Standard speed 12-25 m/min. (Surface speed). Trials with different RPM, feed and rake angle of the blade should be carried out for achieving required finish, accuracy and 'production. |
j) | The adjustment is only within the tolerance. The range given is to inform the Morse-Taper and reaming length available. |