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CNC Collet Chuck, High Speed Steel Collet Chuck rpm, Drill, Grinding and Lathe Machine Center, Fine and Elaborate Manufacture, Stable, Collets

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My Beall Collet chuck arrived and what a work of art it is. now to populate the collet rack.

er32 collets can cost from a little to a lot. obviously "a lot" means different things to different people, but it is not my first choice. So the question is, If one buys moderately priced collets will they all be not so good? My thought was that deep in China there is a machine which churns out collets. The troops measure them and the best ones with 2 temths max runout are sold for high prices and the others are sorted into groups such that the less you pay the lousier they are.

The thing I'm getting at is if you buy less expensive collets will smoe be really good and some not so good or will they all be 6 tenths or worse? In other words, does it make sense to buy a mid-range or a bit less than mid range set indicate all of them and replace the worst. Obviously this only makes sense if most of them are ok. ????

supposing you get a pretty good (pricier) set. there will likely be some runout in the spindle-chuck combination. I assume since the chuck is tightened up against the flat on the spindle it will always have its runout in the same place radially. does it make any sense to compensate the chuck runout with the collet runout by finding the sweet spot by rotating the collet relative to the chuck and then marking it so you don't have to do it the next time. Is this nuts?

since a set of collets encompasses a continuous range of sizes which the chuck can handle, does it really matter whether you get metric or imperial? Unless of course you can't do the conversion in your head.

one of the collet suppliers makes a fuss about how his 2 tenth or better collets induce much less tool wear when used as tool holders. This makes sense but for someone doing mostly one-off things does it make that much difference?

Finally, what is the maximum runout which you would accept in your tool crib?

I guess I'm hoping to get MORE than I'm paying for.

sorry So a few things to consider, I have both an ER32 and ER40 set in imperial, plus a number of metric ER collets.
1. What are you going to use the collets for, to hold endmills or to hold stock? If just endmills, you would do just fine with a 1/8" higher quality set in the specific measurement system you predominately use, I assume imperial. Most endmills come in fixed shank sizes, so you end up only using a few collets 99% of the time. My own experience is that although the collets have a wide clamping range, clamping ability and accuracy (TIR) suffers. This also depends on the quality of the holder and if you use a bearing nut. If you are going to us the ER collets for work holding, then I recommend a 1/32" (0." increment) set which offers a better clamping range then a 1mm (0." increment) set, and is in the more common increment for stock/tooling you will use. Even with this, I have edge finders that have 10mm and 12mm shaft diameters, and the accuracy is improved using a high quality metric collet for each. Manufactures sell 1/32 ER sets, but for some stupid reason they omit a few sizes that they think are not commonly needed. So you may need to back fill several collets.

2. Most manufactures state the maximum TIR of the collets, better ones are usually 0." and the worse usually state 0.005mm (0."), but beyond this is the way the collets is designed and the finish of the collet which can effect the way it seats and the collapsibility of the collet. Higher quality collets are significantly better in this respect at least from my observation. A good bearing or high quality clamping nut can make a significant difference in both TIR and angular skew. We are talking a big difference measured at say 3-4" out. from the collet.

3. I do not believe that collet manufactures have an A and B sorting based on tolerances, they make them to meet different tolerance and fit/finish specs, and maybe the level of QC as to 100% vs say 10%. On ER collets, they tend to be a bit more consistent in TIR then say 5C collets.

4. Brands that I have used, recommend. No name generic, well the QC is often minimal and the collet design may be that when used at it's +/- clamping extremes you will see more distortion. I have seen and others have mentioned this when using metric sets for imperial sizes. I can say that the Iscar ETM (my ER32 set) and Rego Fix (my metric) are super and they all measure under 0." TIR with super finish. I have a few Teckniks (made in Taiwan), that would be my next choice, and 3rd would be a close tolerance or precision set of Chinese manufacture that is guaranteed to meet spec. I have the Z-Live 1/32 ER40 collet set and they are well made and measure well. In order of recommendation below, ETM Iscar (or similar quality), Tekniks, Z-Live (and Shar's), T-Pac or similar. The ETM below may seem expensive, but it includes an R8 holder and you could offer something like$250 and have a super set, or keep a lookout for a set of ETMs, Rego Fix or similar set. On ER holders, it does pay to get good ER holder (and nut), so something like ETM, Lyndex, Glacern (nickle plated), Shar's (higher end models that are nickle plated), etc that usually have a TIR of 0." or better.
https://www.ebay.com/itm/ETM-R8-ER-...ISCAR-Milling-Machine-Lathe-Tool/
https://www.ebay.com/itm/Techniks-ER25-16pc-Precision-Collet-Set-5-32-5-8x32nds-/
https://www.ebay.com/itm/ER32-COLLE...ME-QUALITY-TESTED-RUN-OUT-0-/
https://www.ebay.com/itm/ER32-COLLET-25PC-SET-1-16-3-4-by-16th-and-32nd-ACCURATE-NEW/

5. This all may be moot, in the sense that it the worse set guarantees say 0." TIR and you are machining to 0.001" tolerance, well it is unlikely to make any difference. If just for milling, then better to get a better quality 1/8" increment set in my opinion.

6. No doubt China does turn out very high quality machinery and products, but usually not at the lower price points. Having lived in Japan in the 60's when we use to be a joke about the Japanese quality, the limitation was not the intent willingness to do high quality work, but not having the technology/training and understanding to do so. In contrast to lower end Chinese (and tooling from say India) products, which from my experience there is neither the intent, training nor willingness to do so, nor have any process improvement/QC. Since we gobble their stuff up, I guess there is no incetive to do so. On the high end products produced in China they can meet or exceed products produced in other countries. Just my opinion.