HHIP 3901-5033 Collet Chuck for ER-32, 100 mm Diameter

The product is of good quality for the price, arrived quickly, and was as described - with one exception. In the online drawing, the internal bore which mates with the lathe backing plate for concentricity is specified as 53.975 mm dia. with a very tight tolerance. The design has apparently been altered, as the bore was about 52.0 mm. As I didn't have an inside micrometer to measure it to high precision, I had to proceed very slowly turning my backing plate with very light cuts as I approached the target diameter, testing after each one, to achieve a good tight location fit. I got a good result, but the task would have been easier and quicker if I had had the correct spec.

If you purchased the Vevor 7 x 13.78 mini lathe, this will replace your 3 jaw chuck with no backing plate required, it bolts straight on. Overall diameter is 100mm. Bolt hole spacing is 72mm, the registration circle on the back is also 72mm.

I bought a blank adapter plate and machined it to fit my lathe spindle and then machined the other side to fit this chuck. It runs within 1/2 a thou. (0.0005" ) I was a bit disappointed by the wrench they supplied with the chuck. It is the wrong size in my opinion but it does sort of work. I had a more suitable one that came with another device so I use it instead.

wow half a thousand off runout very please with that tool

Very hard to thread back on, really wants to cross thread.