NIMS Milling Practice Test #1 Questions & Answers Already Passed!!

If a dimension on a drawing is 4.868" with a tolerance of +/- .003", what is the largest the dimension can check and still be in tolerance? - 4.871" If you are standing in front of a vertical CNC machining center, what direction does the X-axis travel? - left to right A boxed dimension is defined as a... - basic S.D.S. (Safety Data Sheet) are sheets that? - Describe the chemicals and materials in the shop. How many 4-7/8 inch long rods can be cut from a rod with a total length of 97-1/2 inches? - 20 What does the code M01 do? - optional stop Match the code to the corresponding letters.... M4 - spindle on reverse How often should you check waylube and coolant levels? - every shift What formula is used to calculate RPM? - SFM times 4 divided by diameter Which display screen mode lets the operator enter tooling related data is? - Offset page What on/off mode switch works in conjunction with a M01 code in the program? - optional stop You are running the first workpiece on a proven program (one that has been run before). Tool 02 is the finishing tool that machines a pocket .437" deep +/- .003". When you measure the part, it checks .4325".What must you do to correct the error? - +input -.0045" to tool 02 height wear offset and re-run the tool A boxed letter represents a _______ . - datum If you want to use a 1.0" diameter 2-flute end mill running at 3000 RPM, what feed rate should you run at to achieve a .003" per tooth chip load? - 18 inches per minute Match the following codes with the corresponding letters _____G54 - Work offset #1 What tool # should be used? T__ M6 S2000 M3 G43 H12 Z1.0 M8 - T12 Which display screen mode lets the operator actually see the distance-to-go in the current CNC command? - Program check page. What direction do you turn the manual pulse generator or move the axis to move a tool from right to left on a cnc mill? - The X- direction What mode switch position allows you to send the machine to its reference position? - Zero Return +/- .005 represents a _______. - tolerance While dry running a proven program, the machine goes into an alarm state and shows a message, Overcutting will occur during Cutter Compensation. "What is most likely wrong" - You need to change the tool dia. or radius offset value.You need to tool change to Tool #11. How would you do it? - Use MDI mode to change tools using commands similar to what a program would Match the M30 code to its description. - program end / rewind You must cut a part to 10.175 inches long and need to add a total of 1/8 of an inch for finish machining. How long should you saw the block? - 10.300" Using a standard high speed steel twist drill, you are to drill a hole .312" deep (not including the drill point). If the drill point checks .098" long, how deep should the drill be programmed? - Z-.410 Why do you have to "home" the machine when you first power up? - so the machine can find the X, Y, and Z axis reference points You have a dimension that is supposed to be 1.105" +/- .0015". Which of these dimensions is out of your tolerance zone? - 1.1033 What button will restart the program after a program stop has been read? - cycle start What mode switch position allows you to move the machine axes manually? - Jog The upper size limit on a pocket is .787". You measure the diameter and it checks .7915". How much oversize is the diameter? - .0045" What is the code G28? - zero return When should safety glasses be worn? - as you enter the machining environment After completing an entire setup and running one tool, you must shut the machine off and go home. When you come in the next day you must: - power the machine up, home it, and go back through the entire setup processWhat is the code M00? - Program Stop What does the G00 code activate? - rapid motion