I’ve seen a Rohm NC Drill Chuck online with an integral 40 taper for the same price as a bare Jacobs chuck with no arbor.
Are these any good. Is there any reason it won’t work on a manual mill? Says it clamps 1-13mm and you use a C Spanner?
I have never used one so this is speculation: I think the idea of these is for use in an auto-tool changer, where you might not need the accuracy of a collet chuck. The integral shank means the length more closely approximates a collet chuck (standard keyless chuck on a Jacobs taper arbor is relatively long and takes up a lot of headroom). It should fit the spindle no problem.
I would look very carefully at the ease and speed with which you change the drill bit and compare with a standard keyless. If it takes three hands, a spanner and five minutes per change to go from spotting drill to tapping drill to clearance drill, it might become tiresome.
