I have the same issue with my Albrecht chinese clone precision chucks. A centerdrill (combined drill/countersink) #4 doesn't go in as far in the clone as it does in my Albrecht chuck though they are definitely the same mechanism. I am very tempted also to use a carbide drill or endmill and at least deepen the hole since I'm not going to drill it through the integral taper. I am also convinced that there could be no downside to doing this. The problem I have is with that #4 or #5 centerdrill in there, it's double ended flutes make it tend to end up untrue in the chuck because the jaws are trying to clamp on the flutes of the back end. The deeper Albrecht doesn't have this problem.
--- In firstname.lastname@example.org, Corey Renner <vandal968@...> wrote:
> Now that my toolchanger is done, I've been moving over most of my Tormach
> tooling onto CatR8 holders. I've popped a couple of my chucks off the
> Tormach arbors and I noticed something strange. The 1/4" chucks aren't
> drilled very deep. The result is that a 1/4" drill held in a 1/4" chuck
> protrudes farther from the spindle than the same drill held in a 3/8"
> jacobs chuck despite the shorter length of the chuck. Not sure why they're
> designed that way. I'm thinking about drilling through a couple of them so
> that they have a thru-hole and can seat a drill much deeper. I can't think
> of a reason NOT to do it, and I also can't figure out why they'd be made
> this way unless it's to save $0.002 on the machining. A couple are
> cheapies, a couple are Rohm. The Rohm ones are the worst as far as OAL.
> Google hasn't turned up any answers. Any ideas? Any reason not to do
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