Spline Gages (HPL)
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INO - System Spline Gauges Almost everything is possible

Indispensable for Constructional Feasibility! “Go” and “not go” gauges are types of spline gauges. They are described in several German and foreign standards, as well as in the international standard ISO 4156. All these standards differ from one another and are neither comprehensive nor technically up-to-date. Spline gauges provide a quick method of inspecting involute splines, serration splines and straight sided splines. “Go” gauges are still indispensable for inspecting constructional feasibility. “Not go” gauges, on the other hand, only represent a limited means of inspection. Direct...

Technical Standard Spline gauges are described in several German and foreign standards as well as in the international standard ISO 4156. Gauge Drawings + Gauge drawings also contain a worn dimension for “not go” gauges All these standards differ from one another and are neither comprehensive nor technically up-to-date. FRENCO’s specialist knowledge facilitates more advanced diagnosis than in the currently applicable standards. + Ring gauges should be provided with protection against hand warmth + All spline gauges are supplied with a full calibrated certificate, including graphs of all...

The Frenco INO System The INO system is a FRENCO internal standard for the external dimensional measurement of spline gauges. National and international standards were taken into consideration in its development and it represents an average of the dimensions specified in these standards. The construction considers the recyclability and manufacturability of the extremely wearresistant material HX. gage plugs Lehrdorne gage rings Lehrringe Frenco INO-L is used as standard for “go” straight flank gauges. INO-L dimensions are available for oversize gauges on request. The tabulated dimensions...

Selection of Materials The content of chromium and vanadium alloy, as well as the hardness of the material, determine the wear resistance of the spline gauge. The time intervals between wear inspections depend on wear resistance, which means that highly wear resistant materials allow the monitoring periods to be significantly extended; this often more than compensates for the higher manufacturing costs. wear resistance Chrome steel low alloy powder steel ASP 23 high alloy powder steel

Delivery Delivery capacity is restricted as a consequence of the technical niche position and the resulting limited availability of trained staff and technical equipment. Delivery times are therefore subject to fluctuations depending on demand and can only be arranged on a waiting list basis. Gauge Drawings The quoted prices for spline gauges always include the generation of comprehensive gauge drawings (also available in electronic form), as well as a full test certificate of the new condition from the FRENCO calibration laboratory. DIN 5480 – N 23 x 1,75 x 12 x 30 x 9H LQ4 Spline plug...

Inspection in New Condition Characteristic Measurement uncertainty Measurement methods Visual gear inspection Damage or rust is not permissible Visual inspection of labeling The labeling must include profile data, standard designation, date of manufacture and manufacturer’s mark Auxiliary dimension over 2 pins Auxiliary dimension over 2 measuring balls with Abbe measurement methods each over 90° in front, middle, rear Measuring force less than 1.5 N Measuring pins must be rubbed Roundness deviation of the measuring pins or measuring balls: max. 0.0003 Deviation of the measuring pins or...

Periodical Wear Inspection is necessary Spline gauges are subject to wear during their use. A wear tolerance with a permissible wear limit for the worn dimension is designated for this purpose. Once the wear limit has been reached, these gauges are to be selected out.In many instances the wear is not uniformly distributed. Testing of the individual form deviations at prescribed time intervals is therefore necessary (also see OFE 05 ‘Wear limit of “not go” spline gauges’). The table below gives reference values for the test cycles of the necessary monitoring of spline gauges. These values...

Wear Inspection of Spline Gauges Characteristic Measurement uncertainty Measurement methods Visual inspection of the gear and spline small damage may be removed with a grinding stone visual inspection of labeling The labeling must include profile data, standard designation and identification number Auxiliary dimension over 2 pins Auxiliary dimension over 2 measuring balls with Abbe measurement methods Roundness deviation of the measuring pins or measuring balls: max. 0.0003 Tooth thickness of plug gauges each over 90° in front, middle, rear measurement force < 1.5 N Measuring pins must be...

The individual deviations of spline gauges rise during wear if the wear is not uniformly distributed over all tooth If gauges have not yet reached the worn size, but the individual deviations exceed the additional tolerances with reference to the values in the new condition, these gauges are to be considered as worn and must be replaced. Permissible assumed individual deviations of spline gauges during wear up to the worn dimension over/between pins (values of a similar order of magnitude are also included in the latest editions of DIN 5480 and ISO 4156):

Specials Special gauges are custom manufactured according to drawings. Here there are almost no limitations. Special ring gauge Master plug gauges for spline gauge rings Setting master

Frenco Product Range High Precision Gears and Splines H Rotation Measuring Systems R Gear and Spline Gauges Instruments with Measuring Circles Master Gears, Master Wheels Multiple Inspector Artefacts, Masters Gear Flank Analysing Linear Gear Flank Analyser Rack Gear Flank Analyser Double Flank Gear Roll Inspection Punches, Dies & Electrodes Profiled Clamping Systems Gear and Spline Manufacture Gear & Spline Inspection P DAkkS -Calibration Instruments for Size Inspection Series V Monitoring of Inspection Equipment Measuring Pins and Ball Inserts Workpiece Inspections Instruments, Rocking...