I picked it up and brought it home yesterday.
It's definitely a D1-5 with 3 pins, integral taper -- my assumption is that its not intended for heavy work, so 3 pins is adequate.
Mounting it was definitely a learning experience -- first mounting, put a finger dial on the inner taper, .011" runout --"OMG WTF is wrong with this thing, did I get taken?" After about 3 hours of fiddling, trying different pins in different holes with varying degrees of failure, I watched an Abom video re: D1 series chuck mounting. In that video, he mentions that you can affect runout by your sequence / firmness of wrenching during mounting. Back out to the shop, fiddle, fiddle -- he's right, I got it down to ~ .0003" TIR by tightening / loosening opposing camlocks. A real eye opener for me, I had never thought that you could shift a chuck on a taper like that -- maybe more pronounced with just 3 pins ? I dunno, but I will be paying more attention and mounting my other camlocks with a DTI in the future.
It's definitely a D1-5 with 3 pins, integral taper -- my assumption is that its not intended for heavy work, so 3 pins is adequate.
Mounting it was definitely a learning experience -- first mounting, put a finger dial on the inner taper, .011" runout --"OMG WTF is wrong with this thing, did I get taken?" After about 3 hours of fiddling, trying different pins in different holes with varying degrees of failure, I watched an Abom video re: D1 series chuck mounting. In that video, he mentions that you can affect runout by your sequence / firmness of wrenching during mounting. Back out to the shop, fiddle, fiddle -- he's right, I got it down to ~ .0003" TIR by tightening / loosening opposing camlocks. A real eye opener for me, I had never thought that you could shift a chuck on a taper like that -- maybe more pronounced with just 3 pins ? I dunno, but I will be paying more attention and mounting my other camlocks with a DTI in the future.