Re: [CAD_CAM_EDM_DRO] Re: CNC Lathes, follow rests, and mass production...

(Thanks everyone who responded....)

Okay... follow rest bad for production, (_maybe_ a three point system)
bar puller good.... got it : )

Two follow on questions:

1) Are there cnc controlled chucks out there for less than the cost of a
first born child?

2) Don't you have to support the other end sticking out of the
tailstock? Or do you just keep it short?

Thanks!

-Jeff

metlmunchr wrote:

>A follower rest is strictly for supporting a flimsy bar such that it
>doesn't deflect away from the tool. If there was no center in the end
>of the bar, as soon as to tool moved out of contact with the bar, the
>bar would be essentially free. That it wouldn't work is minor as
>compared to the danger it would create for both machine and operator.
>
>The earlier suggestion of a bar puller is a workable alternative, and
>you can make your own easily by essentially making a collet a few
>thousandths smaller than the bar and splitting it axially in about 6
>places. Move the collet onto the bar end, release chuck, Z+ move to
>pull the bar to position, close chuck, further Z+ move to pull collet
>off the bar, and proceed with the next part. Even with a manual chuck
>this can be more efficient than trying to pull a bar to a stop with
>your fingers and close the chuck. If you do that, you still have to
>program the stop to move into place, so its much simpler to use the
>puller and let any burrs on the end of the bar chew on the collet
>instead of on your fingers :)
>
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