Hewitt & Topham has been manufacturing QUALITY PRECISION CUT GEARS since 1938. We have a vast range of standard and non-standard CUTTER PITCHES and PRESSURE ANGLES ready to use to cut gears from 2.5m diameter to 6mm diameter. Due to our range of machines and skilled workforce, we are one of the LEADING ENGINEERING FIRMS, for both GEAR CUTTING and PRECISION ENGINEERING, in the north, serving a wide range of industries.
SPUR GEARS are those that have the teeth cut parallel to the axis of the shaft. A cross section of the tooth is identical for both size and shape along the entire length.
SPUR GEARING is used over a wide range of applications from small watches and meters, gear trains on machine tools, in gear boxes as fitted to motorcars and aero-engines, to large drives as found in rolling mills and on board a ship.
With HELICAL GEARING the teeth mesh gradually and at no period is the full width of any one tooth completely engaged.
This gradual engagement and release of the teeth eliminates much of the shock and jar associated with straight teeth when operating under heavy loads
DOUBLE HELICAL GEARS give the same advantages and smoothness as single HELICAL GEARS, but with the added value of a much greater strength in the contact of the teeth and no side ways force.
They can replace spur gears without alteration to the end thrust bearings.
The majority of bevel gearing made is for shafts at right angles to each other, and with the apex of the pitch cones lying at the same point. The size of the tooth diminishes as the cone apex is approached; the contour of the tooth also alters as the tooth size decreases.
BEVEL GEARS feature in a large number of drives including the differential gearing fitted in the rear axle of motorcars, and the drive from the main shaft to the back shaft. They are also used on the drive of many machine tools.
SPIRAL BEVEL GEARING is much the same as helical gearing due to the designing of the teeth, so that the engagement along the length of the tooth is gradual and they can also be used in place of straight cut bevels.
As the teeth overlap and give a continuous pitch line contact with more teeth in mesh at any one time, the load is transmitted without shock or sudden impact loadings on the teeth which gives rise to noise and vibration.
A wheel gear always accompanies these gears. WORM GEARING is another method of driving two shafts the axes of which normally lie at right angles to each other. The usual driving member, the worm, may have either a single or multi-start thread.
A WORM DRIVE has many uses such as, a reducing gear unit between a high-speed motor and a line shaft, the indexing mechanism on a number of machine tools, and in the rear drive of a motorcar.
RACK GEARS have their teeth cut on a flat surface. As there is no curvature on the pitch line, teeth cut to a basic involute tooth form have straight sides.
The teeth may be cut at right angles to the direction of travel as for a spur gear, or inclined if to mesh with a helical gear.
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