jigs and fixture
1) Definition Of Fixture And Jig
Fixtures, being used in machine shop, are strong and rigid mechanical devices which enable easy, quick and consistently accurate locating, supporting and clamping, blanks against cutting tool(s) and result faster and accurate machining with consistent quality, functional ability and interchangeability.
Jig is a fixture with an additional feature of tool guidance.
2) Following the purpose and advantages of jigs and fixtures :
(a) It reduces or sometimes eliminates the efforts of marking, measuring and setting of workpiece on a machine and maintains the accuracy of performance.
(b) Easy, quick and consistently accurate locating, supporting and clamping the blank in alignment of the cutting tool. So it reduces product cycle time.
(c) jigs and fixtures maintain a consistent quality and reduce measurement and its cost
(d) Due to low variability in dimension assembly operation becomes easy, low rejection due to les defective production is observed.
(e) It reduces the production cycle time so increases production capacity.
(f) The operating conditions like speed, feed rate and depth of cut can be set to higher values due to rigidity of clamping of workpiece by jigs and fixtures.
(g) Operators working becomes comfortable as his efforts in setting the workpiece can be eliminated.
(h) Semi-skilled operators can be assigned the work so it saves the cost of manpower also.
(i) There is no need to examine the quality of produce provided that quality of employed jigs and fixtures is ensured.
3) Factors essentially considered during design, fabrication and assembly of jigs and fixtures
1. Easy, quick and consistently accurate locating of the blank in the jig or fixture in reference to the cutting tool
2. Providing strong, rigid and stable support to the blank
3. Quick, strong and rigid clamping of the blank in the jig or fixture without interrupting any other operations.
4. Tool guidance for slender cutting
Fixtures, being used in machine shop, are strong and rigid mechanical devices which enable easy, quick and consistently accurate locating, supporting and clamping, blanks against cutting tool(s) and result faster and accurate machining with consistent quality, functional ability and interchangeability.
Jig is a fixture with an additional feature of tool guidance.
2) Following the purpose and advantages of jigs and fixtures :
(a) It reduces or sometimes eliminates the efforts of marking, measuring and setting of workpiece on a machine and maintains the accuracy of performance.
(b) Easy, quick and consistently accurate locating, supporting and clamping the blank in alignment of the cutting tool. So it reduces product cycle time.
(c) jigs and fixtures maintain a consistent quality and reduce measurement and its cost
(d) Due to low variability in dimension assembly operation becomes easy, low rejection due to les defective production is observed.
(e) It reduces the production cycle time so increases production capacity.
(f) The operating conditions like speed, feed rate and depth of cut can be set to higher values due to rigidity of clamping of workpiece by jigs and fixtures.
(g) Operators working becomes comfortable as his efforts in setting the workpiece can be eliminated.
(h) Semi-skilled operators can be assigned the work so it saves the cost of manpower also.
(i) There is no need to examine the quality of produce provided that quality of employed jigs and fixtures is ensured.
3) Factors essentially considered during design, fabrication and assembly of jigs and fixtures
1. Easy, quick and consistently accurate locating of the blank in the jig or fixture in reference to the cutting tool
2. Providing strong, rigid and stable support to the blank
3. Quick, strong and rigid clamping of the blank in the jig or fixture without interrupting any other operations.
4. Tool guidance for slender cutting