ISO 4156-3 pdf download – Straight cylindrical involute splines —Metric module, side fit— Part 3: lnspection

ISO 4156-3 pdf download – Straight cylindrical involute splines —Metric module, side fit— Part 3: lnspection.
10 Gauges
10.1 Generalities
10.1.1 CondItions of use of gauges
10.1.1.1 GO gauge
GO composite plug and ring gauges shall enter or pass over the complete spline length. Composite spline gauges shall be used without excessive force to prevent damage or distortion to the component or gauge In case of disagreement, the composite gauge shall be accorded precedence in the acceptance or rejection of a part. If there are two gauges available and both are within the gauge tolerances, the gauge which fits the pail shall be accorded precedence.
If a part is rejected by the composite GO gauge, the gauge itself cannot provide the reason. The reason can only be identified by the measurement of the actual tooth thickness or space width using pins or bals, and the analytical inspection of total pitch deviation, total profile deviation and total hehx deviation.
10.1 .1 .2 NO GO sector gauge
NO GO gauges shall not enter or pass over the component in any angular position Inspection shall be camed
out in at least three angular positions as equally distnbuted as possible.
10.1.1.3 NO GO composite gauge
NO GO composite gauges shaM not enter or pass over the component.
10.1.2 Limiting dimensions of use for gauges
The ease of use of gauges Is imited by gauge weight and dimensions.
Parts with a pitch diameter D 180 mm can normally be checked by using gauges.
Parts with a pitch diameter D> 180 mm can also be checked by using gauges If agreed between the customer and the supplier.
10.1.3 Handles of splin. gauges
Plug gauges of pitch diameter I) < 50 mm may be integral. 10.1.4 Number of teeth for sector NO GO gauges The number of teeth on sector NO GO gauges is given in Table 6. 10.5.4 Form diameter Inspection method involute inspection machine 10.5.5 Tooth thickness of plug gauges Inspection methods: measurement over 2 pins. Measurements &iaü oe taken at I., ana , at ea-n end and ii the middle of the pm length. Pins need to be rubbed in order to avoid friction and microdirt Measuring pins have a tolerance (see Table 5) which can affect the measurement over pins. To alow fix this, the true calibrated pin diameter shall be used. 10.5.6 Space width of ring gauges For nng gauges, the reqisrements of 10.5,5 are applicable. Ring gauges are inspected with pms and gauge blocks. The true size 01’ a ring gauge is achieved Mien the gauge block can be moved axially with minrlum resistance and has no radial movement. Taper master plugs for ring gauges may also be used for size inspection. Due to the combined form deviations of ring and master plug, when ring gauges are filled to taper masters, they are larger than those manufactured to a dimension between pens. Master plug gauges are tapered on one side of al teeth and can be checked by measurement over pins in well defined planes. 10.5.7 Form deviations Inspection methods: gear-testing machines. The profile and helix deviation shall be measured in at least 3 equally spaced angular positions on left and right flanks. For composite gauges, the total pitch deviation and the pitch diameter runout shall also be inspected. 10.5.8 Gauge wear inspection An inspection peflod shall be chosen to guarantee that gauges remain within their wear limit. A spline gauge is considered to be worn out when the space width or tooth thickness exceeds the specified wear limit, or one of the form deviations exceeds 1,5 limes the allowed tolerance. 10.5.9 InspectIon certificates When inspection certificates for spline gauges are required, such certificates shall only b. accepted when graphs of the form deviations are provided. Graphs of involute profile shall indicate the form diameter. 10.6 Dimensions, designation and marking of gauges 10.6.1 Inspection of external splines 10.6.1.1 GO composite ring gauge The external splines are inspected using a GO composite ring gauge as shown in Figure 17, with dimensions as given In Table 12.