Re: D1-6 Chuck

On Wed, 21 Dec 2005 12:37:13 -0500, k.pearson
<aslub@xxxxxxxxxxxxxxxxxxx> wrote:

>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
Greetings Karl,
The D mount chuck should contact both the taper AND the back face.
Often times the chuck, faceplate, etc. will have been bored oversize
so that only the back face of the chuck contacts the back face of the
spindle. The chuck should fit such that it requires a little tap to
jar it loose. On the spindle of the lathe there should be two lines at
90 degrees to each other extending radially from the cam tightening
hole. When the camlock is tightened there is a line on the cam that
should fall between the two lines on the spindle. Everything else you
have said about chips, dents, bumps, etc. is absolutely true.
ERS
.

Loading