By Peter C Bell BSc (eds.)
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Additional resources for Mechanical Power Transmission
The magnitude of the thrust load depends on the helix angle and is given by : WT=Wt tan p where WT=axial thrust load ; Wt=transmitted load; the direction of this load is related to the hand of the helix, and the direction of rotation. The axial thrust can be eliminated by using double helical gears but they are unusual in the miniature field. Where space permits double helical gears can be made by using opposite hand single helicals back to back. Helical gears are slightly more complex to produce and inspect because of the helix angle but generally they can be produced to an accuracy comparable with straight spur gears.
Precision cutter grinding is essential to maintain the hob accuracy throughout its life. Most fine pitch gears are inspected by means of the dual flank rolling test. In this test the manufactured gear is placed on a stub shaft which is attached to a floating carriage, mounted on smooth low friction-ways. This carriage is spring loaded towards a fixed shaft, on which is mounted an accurate master gear or master worm. The gear being inspected is slowly rotated in tight mesh with the master, so there is dual flank contact, with no backlash, and variation in centre distance is recorded.
Stationary adjustment type variable-pitch pulley. Should a drive be subjected to heavy shock loading and/or very heavy starting loads, a springless type of variable pulley is available. This is essentially similar to the automatic adjustment type, except that the pulley must be stationary to change speed. A change of speed is carried out by removing the screw which locks the screwed nut. The belt is slackened by moving the slide base platform, the belt is set in the approximate position in the groove, and the cones are adjusted to suit, by means of the screwed nut.