In my search for a collet chuck device for my Unimat DB, I have unfortunately not found what I was looking for. The problem is the ES collets, which are almost impossible to get. I have made my own collet device for ER 16 collets. I first pre-machined the basic body from 42CrMo4 heat-treated steel on the large lathe. Both the fit for the holder and the taper seat for the collet. The thread was turned in the same clamping as the collet taper. I then set the headstock of the Unimat to the collet taper and turned it on the small Unimat by only a few 1/10 mm. this way the taper runs with a maximum deflection of 1.5/100 mm. I bought the clamping nut from the Chinaman.
Bruno