CME 5C Collet Chuck, 5" Diameter, Plain (Flat) Back, For Lathe Use

Could stand to me made from harder materialMy brass hammer left marks in it when I was truing it inGrind quality not the best, was able to dial it in to .0002”

Good lathe Chuck for the price! Had to do a little Boring on the inside diameter to allow the collets to go all the way in. Apparently a final machining operation during the manufacture was not finished. However, I set it up on my lathe and bored it out easily. Overall, quite happy with my purchase.

Here’s a corrected version of your text:The piece itself looks alright, but upon closer inspection, there is porosity in the cast. There are no instructions on how to mount it, but if you're familiar with the D1-4 mount, you likely won't need them. After installation, I checked with my dial indicator, and the runout is really bad. There’s no way to adjust it, so while it’s okay for rough cutting, it’s not suitable for precision work.I’m not sure if I’ll return it at this point, but for now, I’ll try to make it work.

Out the box, the chuck would not mount to my D1-4 headstock as the pins were screwed in too far. I attempted to loosen the pins one turn, but one of them required pliers for the entire thread length to turn it. Once removed and cleaned it could not be easily be reinstalled without excessive force. Upon inspection, it was observed that the tapped hole on the chuck backing plate had badly damaged threads. Luckily I had an M10 1.0 tap to clean up the threads. After retapping, the pin threaded in as expected. After cleaning up the mating surfaces, including some surface rust, and installing in all three pin orientations, the best I can achieve on TIR is about .0008". Not bad, but not up to spec.The scroll mechanism to tighten the collet feels pretty rough - you can feel areas where is sticks moderately. Using it a bit cleaned up some of it, but it seems the machining is pretty rough or the burrs were not cleaned up.Overall OK for the price.

Great quality for a great price. I checked for runout and it was right on .0001 inch.

Ordered two, one came defective and separated at a seam before use causing internal gears to seize.

I almost thought I got a lemon but made sure the cams are pointed between 3 and 6 o clock (after adjusting the studs) then incrementally tighten the cams and find the best position (out of 3 possible positions) I got 0.0005” TIR. Haven’t put it to use yet but am very happy so far.

Very nice, holds great.