Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
4. According to their purposes :
 (a) Workshop Gauge:To Check Dimension
after manufacture
 (b) Inspection Gauge:To check...
Thursday, February 19, 2015 5
Limit Gauge
• Limit gauges are made to the limits of the dimensions of the
part to be tested...
Thursday, February 19, 2015 7
Design of Limit Gauge
• Allocation ofTolerance
– ManufacturingTolerance
–Wear Allowance
•Tay...
Thursday, February 19, 2015 8
Allocation ofTolerance
Manufacturing Tolerance
• It is economically impractical to attempt t...
Thursday, February 19, 2015 9
Allocation of MfgTolerance
Thursday, February 19, 2015 10
Allocation ofTolerance
Wear Allowance
•The surface of “Go” gauge is constantly rub
against ...
Materials which are used for making gauges are high carbon
and alloy steels, cemented carbides, etc.
Plug Gauges : These are used for checking holes of many
different shapes and sizes.
Ring Gauges : External diameter measur...
Thursday, February 19, 2015 20
Classification of Plain Gauge
According to the form of the tested surface :
(a) Plug gauges...
TAPER GAUGE
 The most satisfactory method of testing a
taper is to use taper gauges.
 They are also used to gauge the di...
THREAD GAUGE
 Thread gauges are used to check the pitch
diameter of the thread.
 For checking internal threads (nut, bus...
FORM GAUGE
 Form gauges may be used to check the
contour of a profile of work piece for
conformance to certain shape or f...
SCREW PITCH GAUGE
 Screw pitch gauges areused in picking out a
required screw and for checking the pitch of
the screw thr...
RADIUS AND FILLET GAUGE
 The function of these gauges is to check the
radius of curvature of convex and concave
surfaces ...
FEELER GAUGE
 Feeler gauges are used for checking
clearances between mating surfaces.
 They are made in form of a set of...
INDICATING GAUGES
 Indicating gauges employ a means to
magnify how much a dimension deviates,
plus or minus, from a given...
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Limit gauges
Upcoming SlideShare
Loading in …5
×

Limit gauges

40,281 views

Published on

types of limit gauges and gauge design

Published in: Engineering
  • Login to see the comments

Limit gauges

  1. 1. 4. According to their purposes :  (a) Workshop Gauge:To Check Dimension after manufacture  (b) Inspection Gauge:To check part before final acceptance  (d) Purchase Inspection Gauge:To check part of other factory  (c) Reference or master gauges:To check the dimension of Gauge
  2. 2. Thursday, February 19, 2015 5 Limit Gauge • Limit gauges are made to the limits of the dimensions of the part to be tested.There are two limit of dimensions, so we need two limit gauge. • ‘Go gauge’ should pass through or over a part while ‘Not Go gauge 'should not pass through or over the part.
  3. 3. Thursday, February 19, 2015 7 Design of Limit Gauge • Allocation ofTolerance – ManufacturingTolerance –Wear Allowance •Taylor’s Principle of gauge Design • Fixing of Gauge elements with handles –Taper lock design –Trilock Design • Provision of Guards • Provision of Pilot CorrectCentering • Materials • Hardness and Surface finish • Rigidity • Alignment of Gauge faces
  4. 4. Thursday, February 19, 2015 8 Allocation ofTolerance Manufacturing Tolerance • It is economically impractical to attempt to make “Go” and “Not Go” gauges exactly to the two limits of work tolerance. • Limit gauges are made 10 times more accurate than the tolerances they are going to control.
  5. 5. Thursday, February 19, 2015 9 Allocation of MfgTolerance
  6. 6. Thursday, February 19, 2015 10 Allocation ofTolerance Wear Allowance •The surface of “Go” gauge is constantly rub against the surface of the part in inspection and loose their initial size. •The size of plug gauge is reduced but size of snap gauge is increased. • 10% wear allowance is provided only for the “GO” gauge if working tolerance is greater than 0.09 mm.
  7. 7. Materials which are used for making gauges are high carbon and alloy steels, cemented carbides, etc.
  8. 8. Plug Gauges : These are used for checking holes of many different shapes and sizes. Ring Gauges : External diameter measuring gauges. Taper Gauges :Taper testing gauges. Snap Gauges :These are used for checking shafts. Thread Gauges : These are used for pitch diameter of the thread. Form Gauges : These are used to check the contour of a profile. Feeler Gauges : For checking the clearance between the mating surfaces. Indicating Gauges : To measure the position of the surfaces.
  9. 9. Thursday, February 19, 2015 20 Classification of Plain Gauge According to the form of the tested surface : (a) Plug gauges for checking holes. (b) Snap and ring gauges for checking shafts.
  10. 10. TAPER GAUGE  The most satisfactory method of testing a taper is to use taper gauges.  They are also used to gauge the diameter of the taper at some point.  Taper gauges are made in both the plug and ring styles and, in general, follow the same standard construction as plug and ring gauges.
  11. 11. THREAD GAUGE  Thread gauges are used to check the pitch diameter of the thread.  For checking internal threads (nut, bushes, etc.), plug thread gauges are used, while for checking external threads (screws, bolts, etc.), ring thread gauges are used.  Single-piece thread gauges serve for measuring small diameters.  For large diameters the gauges are made with removable plugs machined with a tang.
  12. 12. FORM GAUGE  Form gauges may be used to check the contour of a profile of work piece for conformance to certain shape or form specifications. Template Gauge  It is made from sheet steel. It is also called profile gauge.A profile gauge may contain two outlines that represent the limits within which a profile must lie
  13. 13. SCREW PITCH GAUGE  Screw pitch gauges areused in picking out a required screw and for checking the pitch of the screw threads.  They consist of a number of flat blades which are cut out to a given pitch and pivoted in a holder.  Each blade is stamped with the pitch or number of thread per inch and the holder bears an identifying number designing the thread it is intended for.
  14. 14. RADIUS AND FILLET GAUGE  The function of these gauges is to check the radius of curvature of convex and concave surfaces over a range from 1 to 25 mm.  The gauges are made in sets of thin plates curved to different radius at the ends.  Each set consists of 16 convex and 16 concave blades.
  15. 15. FEELER GAUGE  Feeler gauges are used for checking clearances between mating surfaces.  They are made in form of a set of steel, precision machined blade 0.03 to 1.0 mm thick and 100 mm long.  Each blade has an indication of its thickness.  To find the size of the clearance, one or two blades are inserted and tried for a fit between the contacting surfaces until blades of suitable thickness are found.
  16. 16. INDICATING GAUGES  Indicating gauges employ a means to magnify how much a dimension deviates, plus or minus, from a given standard to which the gauge has been set.  They are intended for measuring errors in geometrical form and size, and for testing surfaces for their true position with respect to one another.  Indicating gauges can be of a dial or lever type.

×