The 2004 Delta catalog shows that the quill diameter is 1 3/4 inches or
44mm.

Jim,

Thanks for the tip. It is appreciated. Unfortunately, that page is
innacurate. That's the measurement of the quill that they spec it at but
not the measurement where I necessarily clamp onto. There might be a "step"
for a depth guage, etc. We have the catalog here and mark 'em up real good
once we get the measurements the first time around, but I've never had my
hands on this model. Someone else suggested going to a dealer... It would
be like asking your automobile dealer's parts counter and asking them what
the side wall diameter of an internal gear for your transmission is. They
know what the gear is (if you're lucky!), but unless they had access to the
original CAD drawing to make the gear, they don't have that info.

The measurment I need is going to be accurate to +/- .001" or so too.

Bottom line is that I need a "hands on" measurement."

My customer gets theirs in 2-3 weeks so I can always wait... But I'd rather
start my 3-4 week manufacturing process today rather than wait till then.