Accusize Industrial Tools 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.

I'm using this piece on an old Rong Fu-30 Mill/Drill, so from that perspective, this collet holder is well made and is of high quality. It will make changing endmills a breeze, without ever having to mess with drawbar. The collet holder came well packaged and arrived on time......thanks!

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.

Bought this as a replacement be cause the kit from accusize the er32 nut for the r8 collet was never finished the spring nut that clamps the tool does not fit ..... I ordered another thinking it was a one off issue this one is the same DO NOT BUY THIS YOU HAVE TO FINISH MACHINING IT IF U WANT IT TO WORK

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 chuck I ordered had an installed in the mill run-out of .003". I returned it. They advertise it to be less than .0002" TIR OD to ID. Not sure what OD to ID is referencing. My mill has an almost undetectable runout with a gauge pin in a R8 collet. I ordered another of the same brand and it has an installed in the mill run-out of .0025". Just simply not what was advertised. Both chucks had a great outer finish, but that is not what produces the finished part. Buyer beware.