I just saw this device mentioned in a different post on PM. It converts a 3-jaw power chuck, as are often used on CNC lathes, to hold standard 5C collets. The normal power chuck operator opens and closes the collet. Pretty slick, but expensive. Maybe the idea could be copied and made to work with 2J or other larger collets if larger bar capacity is required and the power chuck is big enough..
Nub Tools Master Jaw System, 6" Chuck Size for 5C Collets - 4720646-5C - Penn Tool Co., Inc
Larry
The "usual suspects" have a whole range of such gadgets, and have had for ages. Some are dirt-simple:
Vicon Precision Universal Collet 2J to 5C Adapter - 7249-2J - Penn Tool Co., Inc
Dunham - a division of Lisle - even seems to have specialized in it as a market "niche"?
A2-5 | Dunham Tool Company
Mind . these make economic sense for balls-to-the-walls CNC high throughput, earn - or LOSE - half a cent per each part, make it up in VOLUME and the recovery off the chip-dumpster scrap-metal recovery payment!
And then you have the "high priced spread" at around twenty-THOUSAND-mike-foxtrot-yew-ass-dollars per-each spindle?
Well... some of those CNC spindles can crank upwards of twenty thousand RPM, too!
You do NOT install a "DIY shrapnel kit" on the nose of those puppies, do yah?
ISTR BIG-Kaiser pumping a sub-spindle with EIGHTY thousand RPM capability? Mere forty-thou RPM ones are old stuff... and by easily a quarter-century already?
That class of goods - out at the "bleeding edge" so to speak - are a tad COSTLY to justify for hobby, onesie, other "smallholder" even "revenue" earn-my-basic-crust use ... where the value of the goods has less to do with "how many per hour?" and "what mass of chips does it leave?"
Horses for courses, merkins for gherkins, and tooling?
For fool, common man, or genius alike!
Nobody cares.
Just work
smarter!
2CW