July 2019 11
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Rotary Table
7
Removing the chamfer with a boring head
8
Rough cutting the 6mm steel discsuch as judder, uneven braking and
pedal bounce are a few of the problems
that will be experienced. I doubt such
accuracy could be achieved in the home
workshop. Starting with the brake disc
the central hole has quite a deep chamfer
(not all brake discs are like this) which if
(^910)
you get the same sort needs to removed,
photo 4. The disc is way too big to fit in
My Myford lathe, so I turned up a scrap
of aluminium to a tight fit in the disc and
centre drilled it, photo 5. This enabled me
to centre it in my milling machine under
the quill, photo 6. Then machine away
the chamfer with a boring head, photo 7.
It’s not critical as to what size the hole is as
the 6 mm steel plate will be machined to suit.
Apart from a few tapped holes that’s all the
machining the disc needs.
The 6 mm steel plate has an 8mm hole
drilled in the centre and then has the corners
11
Drill and tap and slot the base plate
Turning the 6mm steel disc to size Countersink the steel disc