IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

A gear-shaping process is used to cut cylindrical gears, both external and internal, with a pinion type of cutter. However, certain ‘inherent errors’ are present in the process which limit the range of the number of teeth on the gear to be cut. This paper deals with the analysis of inherent errors and suggests guidelines to avoid such errors, taking into account the effect of tip-relief angle © 1983 Taylor &amp; Francis Group, LLC.

Department of Mechanical Engineering

GENERAL

International Journal of Production Research

Limiting conditions in a gear-shaping process

The technique most commonly used to produce cylindrical gears, both external and internal, is gear shaping with a pinion-type cutter which generates gear flanks with rotating motion and removes chips by reciprocating action. Though the gear shaping cutter of a specific module can be used to cut gears with a wide range of teeth of the same module, in practice the inherent errors limit the number of teeth that can be cut on the gear. This paper analyses such inherent errors for both external and internal gears, taking into account the effect of a tip-relief angle and considering both "corrected" and "uncorrected" gear forms. © 1983.

International Journal of Machine Tool Design and Research

Limiting conditions in gear shaping for corrected involute gears

This paper deals with the theory pertaining to the development of pneumatic gages. The fundamental air-flow equations have been suitably developed and verified for their validity. An information obtained from the computed results in the form of charts is very useful for the designers. A back-pressure pneumatic gage has been developed and tested to assess the performance and the results have been discussed.

World University root node

Mechanical engineering bulletin

THEORY, DEVELOPMENT AND PERFORMANCE EVALUATION OF BACK-PRESSURE PNEUMATIC GAUGING SYSTEM.

Gear shaping cutters are provided with top-relief and rake angles. As a result of this, the profile representing the cutting edge is modified. This paper deals with the method of obtaining the effective profile on the rack-type and pinion-type cutters for spur gears. Analysis of the effective profile shows that the effective profile of the rack-type cutter is actually a straight-sided tooth form with different pressure angle and tooth thickness at the reference (pitch) line. In the case of the pinion-type cutter, tooth thinning takes place and the effective profile could not be identified with any involute form. This paper also deals with the methods of correcting the cutter profile form so that profile close to the theoretical form can be obtained on grinding the rake face. This approach would be quite useful to the designers and manufacturers of the shaping cutters. © 1983, Institution of Mechanical Engineers. All rights reserved.

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

Effect of top-relief and rake angles on the gear shaping cutter profile

During the shaping process, the profile generated on the internal gear deviates from the theoretical profile even when the difference between the number of teeth on the gear and the cutter is large. This paper describes a method for simulating the shaping process while cutting the internal gear. For the first time, quantitative evaluation of profile deviation has been made possible by this approach. The results are adequately verified by experiments. A thorough analysis has been carried out on the simulated profiles and suggestions are made to reduce the deviation from the theoretical profile. © 1982.

Profile deviations in internal gear shaping

Precision Engineering

Surface finish measurement using microwaves

INDUCTIVE AND CAPACITIVE MEASUREMENTS OF SURFACE FINISH.

Various skid configurations were studied by computer simulation of a doubly curved skid. Performance of these skids has been analysed for both simulated and sparkeroded surfaces. A random process technique was used to analyse the datum line established by various skids for the spark eroded surface. © 1979.

Doubly curved skids in surface roughness measurement

Letter to the editor

The roughness of surfaces normally not accessible by conventional stylus instruments is often measured by a replica technique. The replica surface is the mirror image of the original surface. This paper deals briefly with an analysis of the reference lines used in practice for roughness measurements from surface profiles of original as well as replica surface. A statistical analysis of surfaces produced by different processes and of their true replicas is reported. © 1976.

Wear

An analysis of the reference lines of the surface profile and its true replica

In the envelope system of surface finish measurement, an envelope traced by a circle of definite radius gives the reference line for a two-dimensional surface profile. Geometrical construction of this envelope, on actual surface profiles, is fairly easy. For evaluating the benefits of the E-system it is advantageous to use digitized surface profiles, to compute the envelope from the profile ordinates. There are several ways of computing the envelope from digitized surface profiles and this paper explains the various methods and gives the times taken for computation. © 1976.

Computer-Aided Design

Comparison of different methods for computing the two-dimensional envelope for surface finish measurements

In this paper, a method to compute the reference line for the surface profiles by the random process analysis is explained. This reference line is compared with the other practical reference lines, namely the electrical mean line and the envelope. This method is also an interesting and useful tool for the curve fitting analysis.

Inst Mech Eng (Lond) Proc

SELECTION AND FITTING OF REFERENCE LINE FOR SURFACE PROFILES.

After briefly going through the procedure for computing the mean lines from different electrical filters, this paper compares the behavior of the mean lines for practical surface profiles, using random process analysis. The electrical fiters compared are the standard filter, the phase corrected standard filter and the 3:1 phase corrected filter. Roughness values, measured with different filters, for a few practical profiles are also included.

Isr J Technol

COMPARISON OF THE MEAN LINES OF SURFACE PROFILES OBTAINED FROM DIFFERENT ELECTRICAL FILTERS.

The E-system of roughness measurement can be used either for a two-dimensional or a three-dimensional assessment of surface roughness. The procedure for computing the two- and three-dimensional envelopes from digitized profiles is briefly explained. This method will be useful for verifying the results obtained by practical instruments. The filtering characteristic of the E-system, when used for two- and three-dimensional roughness measurement, is analysed with reference to theoretical profiles. Various skid configurations are studied using a doubly curved skid simulated by a computer.

TWO- AND THREE-DIMENSIONAL ANALYSES OF SURFACES ACCORDING TO THE E-SYSTEM.

In practice, the instruments measuring according to the E-system refer to a three-dimensional envelope as the measurement is carried out by means of two styli, one a sphere and the other a normal tracing stylus. In this paper, the computational approach to the two-dimensional envelope is reviewed and the extension of the same method to compute the three-dimensional envelope is explained with reference to two-dimensional profiles obtainable with single stylus instruments. © 1974.