Coventry Dieheads
Some details of the heads and jigs etc - Page 2
The range of chasers available covered all types of machine and other screw types. Wood screws,
acme threads, buttress threads and knuckle threads that were used on railway carriage and wagon
couplings were all available from the factory. The dieheads could also be set up for taper threads with an external attachment.
Close-up shot of the single chaser holding fixture with a chaser mounted inside.
The angle of the ground face is set by the casting without the base fitting.
Sharpening jig baseplate, showing the markings for the machined grooves in which
the top half of the jig fits.
The following pictures show the three possible combinations of position,
plus the top jig can be used without
the base, adding a further setting. The 15 degree setting uses
both the horizontal faces, while the 33 degree
and 45 degree settings use the angled faces and one side rest.
Additional marking information for use with special chasers, and a better idea of the relationship
between the 15 degree seats (both laft and right hand horizontal faces) the 33 degree seats (3rd from
the left and extreme right hand) and 45 degree seats (third from the right and extreme left hand)
Top half of the jig in the 33 degree position.
Top half of the jig in the 15 degree position
Top half of the jig in the 45 degree position.
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