39. THE BOX SECTION SPINE
DRILL HOLES WITH A PILLAR DRILL FOR ACCURATE ALIGNMENT
Ø8 Ø25 30 50
355
380
Weld the shaft in the 25mm hole. Take care to hold the shaft as square as possible
(90 degrees) to the spine, when welding it.
The bearing hub (diagram 40) fits on the shaft. It has two 50x25 mm deep-groove
ballraces in it, with a spacer between them. It needs a plastic cap over the end to
keep dirt out of the bearings.
Do not forget to grease the bearings. Pack them with grease around half of their
circumference only. Do not fill them entirely or they will become stiff to turn.
40. THE BEARING HUB
Ø10
Ø120
PCD102
Ø65
63
8 Ø32 Ø25
25 25
35 20
PMG manual
page 37
June 2001