Hi Mac, Chuck adapters are concentric with the chuck body and don't
extend the chuck's overhang. Spindle reducing adapters do extend the
chuck, faceplate or whatever device that's being driven. To the extent
that the more the overhang the less safe, a chuck adapter is preferable
to a spindle adapter, but both are useful and relatively safe.

That brayed, I have several homemade reducing spindle adapters for using
old 3/4 in. and 1in. fixtures that seem safe enough to me. Also a
spindle reducing adapter allows me to use much cheaper dies, nuts &
bolts for shop made devices.

I think the important thing is to use steel instead of aluminum adapters
and to be sure to secure them to the chuck or spindle.


Turn to Safety, Arch
Fortiter


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