Origin Live Building a turntable almost from scratch - Manual (Page 17)

17
Diagram showing bearing house fastening arrangement
Bearing House
Allen bolt
Spacing washer
Bearing House
Sub-chassis plate
Bearing plate
Bearing house nuts
17 mm
Fit the motor
Fit the motor to the motor plate using the 3 small machine screws supplied. These screws should be “just” tight to keep
motor noise to a minimum. The motor fits on the underside of the motor plate – see “diagram of sub-chassis assembly”.
The motor plate is adjustable to enable optimum belt tension to be achieved – The belt tension is set by rotating the
whole motor assembly on it’s pivot point. The motor is held in position by the friction of the pivot assembly. If for any
reason this becomes slack you may need to tighten up the pivot bolt. Ideally the centre of the pulley should be
approximately 124mm from the centre of the bearing house. Generally the optimum position is such that marker bolt in
the “slot” is located at approx the mid point of the slot and this provides a useful reference point. Install Sub-chassis &
Fit springs
Fit the Sub-Chassis
Offer up the sub-chassis assembly into the plinth and fit the springs as shown in the “ diagram of support rods and
spring arrangement”. Each particular spring is of a different compliance and should be in the positions shown in the
“diagram showing spring positions
Diagram showing spring positions
MEDIUM
SPRING
POSITION
THICK
SPRING
POSITION
THIN
SPRING
POSITION
Dress the motor wires
Screw one of the cable clips onto the inner side wall of the left hand side of the plinth (see “top view of wiring layout and
connections”) such that it holds the input and motor wires (brown, blue, red & black) away from the sub-chassis and any
danger of restricting it’s movement. For full details on the motor and power supply set up read the relevant section
contained later in this manual.
Install the arm