numerical control is designed to control the operation of a machine tool by a series of coded instructions called a program.
a part program is stored in the form of blocks of information, and each block has the numerical data needed to manufacture a segment of the work-piece.
like a conventional machine tool, the nc system can’t replace the manual actions of the operator either.
数字模拟转换器的英语全称是
模拟数字转换器的英语缩写是________
an important advance in the philosophy of nc of machine tools was the shift toward the use of controller units instead of computers in nc systems.
dnc is short for direct numerical control.
one of the aims of cnc systems is to replace as much of the conventional nc software with hardware as possible.
the part program contains a description of the _________.
several machine tools are directly controlled by a central computer, this is the _________.
as nc machines need a large capital investment, we should efficiently use them.
machining is the manufacturing in which the workers can remove the excess material of a part on a machine tool.
the feed is defined as the distance the cutting tool projects below the original surface of the work-piece.
____is the relative lateral movement between the tool and the work-piece.
edm（electrical discharge machining）refers to in chinese term
part programmers must have a solid knowledge of machining processes and know a lot of the capabilities of the machine tool.
nc part programming includes three tasks: the collection of all data needed, the calculation of the tool path and the arrangement of those given and calculated data.
the required data contained in each line of the manuscript includes all machining instructions for transferring the cutting tool from one point to the next one.
programmers should ________ the particular nc machine, its capabilities, and specific codes.
the core of ________, however, is preparation of the manuscript, its conversion into a verified tape, and subsequent editing.
never attempt to machine a work-piece without first checking the operation of the machine.
before starting a production run, it's not necessary to perform a trial run.
when using a tool compensation function,you should check the direction and amount of compensation.
incorrect operation may lead to ________.
before operation the machine, you should read the contents in the _______.
cnc diagnostic support at present includes four basic categories: start-up diagnostics, on-line diagnostics, off-line diagnostics and background diagnostics.
start-up diagnostics are a diagnostic routine that regularly operate automatically when the cnc is switched on.
off-line diagnostics are manual diagnostics which are intended for thorough maintenance performed by trained technicians.
numerical control machine operators set up and tend ________.
with ________ based cnc machine tool controllers, maintenance and repair are no longer an issue.pc
“strut-machining department” means “柱式机床部门”.
the cnc can‘t send messages to those users that its windows account can access.
factory automation (fa) is becoming the developing trend of factories.
by connecting ____ to the personal computer and the cnc, the programmer can transfer programs from the computer to the cnc.
what does cad mean?
not only most of major machine tool manufacturers but also the cnc suppliers offer a wide variety of end-user training on cnc machines.
during the early years of hardwired nc, built-in diagnostic tools existed.
the emphasis has changed from "how to fix it" to "how it works".
the function of direct current regulated power supply is to input an alternating current power of 220volts, so that it can output __________.
fanuc control system works under a _________volts voltage.
although the robots resemble human beings, they cannot do the work of humans.
scientists are developing an intelligent robot that can “see” and “touch” and make decisions like human beings.
the technology of robots is completely the same as the nc technology in every way.
pc (proportional controller) refers to in chinese term
it is a very big opportunity for human; the challenge is _______ it wisely.
in today’s aerospace and aeronautics industry, a complete aircraft may be designed without a cad/cam system.
advanced cad/cam systems include not only solid geometry modeling capability but also nc verification programs.
generally speaking, a cad system is an ytic tool for design.
to avoid accidents, read safety guidelines and related ________ carefully and operate the system correctly.
if the nc machine tool is used in a wrong manner, it will ________ serious injuries and machine damages.