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### 10 Cards in this Set

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 The basic mechanism for chip formation is by shearing. [TRUE or FALSE]? TRUE A built-up edge (BUE) consists in layers of material from the workpiece that gradually are deposited on the tool tip. [TRUE or FALSE]? TRUE The tendency for BUE formation can be reduce by the following means: Increase the rake angle Grooves in the cutting tools cannot act as chip breakers [TRUE or FALSE]? FALSE Using Taylor for tool life and letting n=0.5 and C=400, calculate the percentage of the increase in tool life when the cutting speed is reduced by 50% 300% Metal Carbides are harder than Ceramics [TRUE or FALSE]? FALSE For machining steel and cast iron, the diamond is the recommended tool. [TRUE or FALSE]? FALSE A machining operation is being carried out with a cutting fluid that is an effective lubricant. What will be changes in the mechanics of the cutting operation if the fluid is shut off? The chip will become thicker Diamond tools work very well at high temperature (higher than 1000 Celsius) [TRUE or FALSE]? FALSE Assume that, in orthogonal cutting, the rake angle is 15 and the coefficient of friction is 0.2. Using the equations: to/tc=sin/cos(-α); =45°+ α/2 - ß/2; µ=tan ß >> 16% α = rake angle  = shear angle ß = friction angle µ = coefficient of friction t0 = depth of cut tc = chip thickness to/ tc = cutting ratio or chip-thickness ratio α = 15°  = 45° + 15/2 – 11.3099/2 = 46.85° to/ tc =sin (46.85)/cos (46.85-15) = 86% to/ tc =sin (41.6)/cos (41.6-15) = 74% (0.2) = ß 11.3099 = ß 2 µ = tan ß (0.2) = ß 21.8° = ß  = 41.6°