Part
Stepped spindle shaft
Three diameters turned from bar with a keyway flat and a threaded nose. Concentricity between the bearing seats is the whole specification.
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RANGE
Three parts, and the reference each is built from.
The range covers stepped shafts, milled housings and drilled mounting plates. Each part page carries the feature everything else is measured from and the questions worth settling before a drawing is issued.
Part
Milled housing
A pocketed housing with a through bore and four mounting holes. The pocket floor and the bore axis are what the assembly is built from.
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Part
Drilled mounting plate
A flat plate with a six-hole pattern and a raised bronze boss. Position of the pattern against the boss is the only dimension that matters.
Open the part →How the range is organised.
By the reference the part is built from rather than by the machine that makes it. A shaft is built from its axis; a housing from its bore; a plate from its boss.
- Turned parts
- Built from an axis · concentricity and roundness decide the part
- Pocketed parts
- Built from a bore or a floor · the other is referenced to it
- Drilled patterns
- Built from a centre · position against that centre, not against an edge
- Fitted parts
- Built from the mating component · the fit decides the tolerance