In order to improve the surface quality of the threads turned by the composite thread processing instruction, the measures that should be taken are ().
a. Modify the spindle speed.
b. Change the tool.
c. Set the tip angle parameter to be smaller than the actual tip angle.
d. Reduce the depth of the knife.
Answer: C Multiple Choice] 35h9 f9 makes up a () mate.
a. Base hole clearance.
b. Base shaft clearance.
c. Transition of base hole system.
d. Interference of base hole system.
Answer: A single choice] When using a machine reamer to ream, the cutting speed is generally about ().
a、30m/min
b、20m/min
c、3m/min
d、10m/min
Answer: D Multiple Choice] If it is known that the starting point coordinates of the tool along the straight line are (x20, z-10) and the end coordinates are (x10, z20), then its program is ().
a、g01x20z-10f100
b、g01x-10z20f100
c、g01x10w30f100
d、g01u30w-10f100
Answer: C Multiple Choice] In the following combinations, the tolerance grade is inappropriate to choose ().
a、h7/g6
b、h9/g9
c、h7/f8
d、m8/h8
Answer: C Multiple Choice] on the operation panel"delet"The role of the key is ().
a. Deletion. b. Reset.
c. Input. d. Start.
Answer: A multiple-choice question] The harder the workpiece material, the more likely it is to produce chipping and cutting.
a. The smaller the rake angle of the tool.
b. The larger the rake angle of the tool.
c. The greater the amount of knives eaten on the back.
d. The smaller the amount of knife eaten on the back.
Answer: AC True or False] The selection of parts and materials should first consider the manufacturability of its processing, that is, the feasibility of manufacturing.
a. Correct. b. Error.
Answer: B True/False] The degree of difficulty in cutting metal materials is called cutting performance.
a. Correct. b. Error.
Answer: A True or False] After the CNC system fails, if you understand the whole process of the fault and confirm that there is no danger to the system when the power is on, you can power on to observe and check the fault.
a. Correct. b. Error.
Answer: a