Re: D1-6 Chuck

On Wed, 21 Dec 2005 16:02:55 GMT, "Dick" <dicky@xxxxxxxxxxxxxx> wrote:

> When mounting a collett chuck on a lathe with a D1-6 mount, just what is
>tweaked to get the closer to run true? Is the closer supposed to be pulled
>back flush to the lathe spindle plate or ride on the spindles registration
>offset? Also, how far are the cams supposed to engage the spuds on the
>collett chuck?
>I've never used a D anything before and before I screw something up I would
>like to be reassured that what I believe needs to be done is correct.
> Thanks all,
> ***
***,
Let me try to get this answer started. Others will correct my
mistakes, I'm sure.

D type mounts seat on the taper, not the back face. The cams pull the
chuck onto the mount. The cams studs are adjustable in the chuck
(usually by screwing them in or out) and should be adjusted so the
cams need to be turned 1/4 to 3/8 turn to lock. Some people seem to
think they need to turn the lock further to get a good seat - not
true.

Accuracy of a D mount is in the tapered mating surface. Indicate the
lathe taper and gently clean any nicks. If it runs out, the spindle
is bent. Then clean and gently deburr the internal taper on the
chuck. If these two surfaces are clean and true, you will get the
best alignment (often within a .0001 or so). Cleanliness and surface
condition of the other parts of the chuck or collet closer will then
be the other places where runnout / wobble can occur.

"Cleanliness is next to high fidelity" Stan Freberg

Karl Pearson
.

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