R8 Shank Er32 Collet Chuck, Max RPM: 8000 RPM, 7/16''-20 Drawbar End, Max TIR 0.0002'' O.D to I.D. 0223-0232

One of my favorite milling machine purchases. This is very well finished, it holds the tool true and very secure. Runout appears excellent, as I'm getting very accurate milling with this - CNC grade tolerances. The threads are very high quality and the price is amazing.

For the price this is a nice product. Seated in my R8 spindle well and runout was minimal. Good collet holder for the price.

Product is labeled as Can CNC so you'd assume it's made in Canada, but it's made in China. This does not come with a Spanner wrench, but one is easily acquired. That's the only negative. This is a beautifully machined collet holder. Very precise and threads are very smooth. I'll definitely get another one with a MT3 taper for my lathe.

The first thing I did was to check the runout. My PM-30MV mill spindle runout is barely measurable at 0.00008. The body OD of this R8 ER32 chuck shows 0.0001 when mounted, but the inside surface of the ER32 surface (where the collet will mount) shows 0.0003. So it just barely misses its advertised 0.0002 spec, even when allowing for my spindle 0.00008 addition. But it is PLENTY good enough for my hobby machinist needs. The machining is beautiful; fits perfectly into my mill, and the nut is smooth. Two small things to mention: - It is laser etched with "CanCNC", not "Accusize" as shown in the listing photo. Others have mentioned this. I'd expect that ordering from Accusize should truly be an Accusize brand. I'd hope that the manufacturer will comment on this. - The flats across the chuck's body are spaced at 41.90mm. Perhaps that's normal for a true Bridgeport mill. Mine is a Precision Mathhews mill and the flats on its spindle are 40.85mm. The PM supplied spindle C-wrench measure at 40.92mm, so it's a fairly snug fit. And so the wrench will NOT fit this Accusize chuck body. No big deal (I'll use my mill to knock a mm off of the body flats), but thought I'd mention it.

I see many complaints that the machining is inconsistent or off center. That’s not the cast they just don’t know or didn’t read the instructions how to use the tool. Please read the instructions and see how the collet properly is inserted into this holder.