Connector components
A ring-shaped turned part with slots: bore fit and slot indexing are more critical than the outside diameter.
Part family · Turned components
Motor housings
A thin-walled cylinder where bore coaxiality and face squareness determine how the rotor fits.
What it is, and where it usually goes wrong
A motor housing is a thin cylinder with a bore the stator presses into, and two faces the end caps sit on. The rotor only runs true if the bore is coaxial along its length and both faces are square to it — a housing that is round at the ends and oval in the middle will press the stator out of shape.
How we machine it
- Rough bore, stress-relieve, then finish bore in a set-up that supports the outside diameter along its full length.
- Face both ends from the same bore datum rather than from the outside diameter.
- Hold on a mandrel or with soft jaws bored to size; a three-jaw on a thin shell telegraphs the jaw marks into the bore.
- Measure the bore at both ends and the middle before releasing the part from the fixture.
Where it is used
Servo and stepper motor shells, gearbox end caps, pump bodies, encoder housings.
What we check before it ships
- Bore diameter and roundness at three heights
- Coaxiality of the bore along the length
- Squareness of both end faces to the bore
- Press-fit allowance against the stator diameter
Measured against your drawing and written on the inspection sheet that ships with the parts. First article reports are available on request.
What to send for a quote
- Stator diameter and its tolerance, since the press fit is the whole job
- Housing length and wall thickness
- Whether the ends are open, capped or have a bearing seat
- Cooling features, if fins or a water jacket are part of the design
A STEP file plus a drawing is ideal; a PDF with tolerances also works. Quantity, material and finishing are enough to give you a real price instead of a range.
Questions we get on this part
What press fit should a stator use?
That is an engineering decision for the motor design, but the housing must be machined to whatever you specify and measured before shipping. We report the actual bore at both ends so you can see the margin before pressing.
Can you hold the bore after the housing is welded?
Welding distorts a thin shell, so the bore has to be finished after welding, not before. If the design has welded flanges, send the welded assembly drawing and we will sequence the machining after the weld.
Other turned components we machine
Long connecting rods
A slender tubular rod: straightness, bore alignment at both ends and end threads are the three control points.
Precision flanges
A disc-shaped connector: bolt-hole indexing and the flatness of the sealing face are what the drawing really asks for.
Send a drawing, get a price within 24 hours
STEP, IGES, DWG, PDF or a dimensioned sketch — plus material, quantity and finishing. We reply with a price and any questions in one message.