SILIVN 26PCS ER32 Spring Collet Set for CNC Engraving Machine & Milling Lathe Tool Workholding Engraving Collets

Collet set is of good quality and I have used several of them on my CNC. Was a good purchase.

For the price, you won’t find better. If you need absolute precision, you’re shopping in the wrong place and had best adjust your budget.Mine were all machined well and useable out of the box with only a quick cleaning to remove packing oil. Runout was less than .001” (I don’t have a test indicator with more resolution as my work doesn’t require that level of accuracy) and definitely acceptable for my purposes. They hold appropriately sized end-mills very well and I haven’t experienced any slippage even with heavy cuts in tough material.

Fantastic collet set. First day I had them I used at least three different collets. I would give 5 stars but, one of them had a couple of pieces of metal chips inside from the slot cutting. I could not hesitate to buy them again, just know you'll want to check each one before the first use to make sure any metal chips do not interfere with the closer. I used the 3/8 to tram the head on a new mill. I then used the 1/4" to hold a indicator to square up my new vise and to mill the vise keys to fit my slots. I then use the 1/8 to mill a slot in a part. The results were perfection.

Great for small collet enthusiasts that like to machine things at night. Can hold drill bits as well as mills and havent had much issue with runout .. all tool survive full RPM without crazy chatter.

I used almost every one of these for a drill regrinding project, (1/8-1/2 by 1/32nds) and they all appeared concentric, gripped well, and gave drills with near perfect split points. (Perfect as far as I can measure.)I did not try to measure the accuracy of the holder, but if you are trying for sub 0.001" accuracy, I suspect that this should probably not be your set of choice.

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I haven't used them yet, but they look great.

Half of the sizes were missing. Still had 26 pieces in total, but most of the sizes had duplicates and even a few triplets. I had to return this. I could have lived with a couple of the 32nd sizes missing, but what I got was missing the common sizes like 9/16", 5/8", and 3/4". The picture shows the 12 sizes that were missing, 8 duplicates, and 2 triplets (sorry I had poor lighting and should have laid them out better).I tested a few of the sizes that I did get and I was not impressed by their accuracy. Most of them had between 0.002" to 0.006" of indicated runout and they were not repeatable. I'd chuck up a precision ground rod and at first I'd get about 0.004" TIR. Removing and re-chucking the same rod it would might go down to 0.0015" or up to 0.005". I think I did manage to get one bar chucked in at about 0.001" TIR, but only after piddling with it for a few minutes. As a sanity check, I indicated the taper inside my collet chuck and read about 0.0004" in the front and back with the high spot on the same side... meaning that it was off center that amount but still parallel with the spindle.Even if I had received all the sizes they advertised, what I received was nowhere near the advertised 0.0005" runout. Completely unacceptable for collets. I should have known what to expect, but I took the gamble anyway. I ended up returning these and ordering some from LittleMachineShop. Those actually stand up to their stated specs.