6 Mar
2014
6 Mar
'14
11:36 a.m.
On Mar 5, 2014, at 3:08 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I mentioned that Plessey drive with the naked paltter going oto a
machined regiser in the hub. It was a very easy fit, I would guess a thou
or more of clearance. SO that gives some idea. My guess is that if you
could do it to within a thou it would be fine.
And yes,I've centred many thigns in the 4-jaw with a DTI. But there is
oen crucial difference. With the 4-Jaw, you can lightly clamp the object
with 2 of the jaws, then cetre in in the other direciton using the other
2 jaws to move it -- effectively using the screws of the chuck as
pseudo-leadscrews. But with the RK05 platter, there is nothing to move
it, just a clamping ring. It would be more like (for the lathe analogy)
trying to cntre something on a faceplate and then clmping it down. A lot
harder.
I am thinking I might make a fixture with some screws/pads to ba able to
move the platter slightly wrt the hub.
-tony
...
You don't ahve to mechanically balance it as well. Of course just
centring the disk accurately is non-trivial?
What?s the required accuracy? With some patience and an inexpensive
dial indicator, centering to .001 inch (25 micrometers) is doable; lathe
operators do it all the time with their 4 jaw chucks.