How to Save Money When Buying Collet Sk

I actually switched from ER collets back to endmill holders because I couldn't get our collets to run true enough or hold tight enough for our applications. I suspect the poor quality Chinese collets I was supplied with had something to do with it, as well as the fact that I could only get metric collets that didn't align very well with our imperial tooling. Side lock EM holders will always have some run-out, so ER collets have the potential to run more true, but I was never able to achieve that accuracy. I don't believe in "standardizing to only one tool" as a good solution; I prefer to pick the best tool for the job. ER collets are a very good choice for many tasks. However, for high pull-out forces on endmills or very tight clearance areas, I've found normal sidelock holders to be superior. On the other hand, tap holder collets are a godsend, and having a good ER selection for odd drill sizes and unusual form tools is essential.

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Danny

What tolerance do you really need on a manual wood lathe? I agree on the advantage of passing material through the spindle, especially on my metal lathe with an MT3 taper. An MT2 can only pass a little over 1/2". I have several ER32 chucks from www.banggood.com that are good quality for under $25. I use the MT2 chuck in my tailstock for accurate drilling/milling. I have a flange-mounted one that lets me pass 20mm through the headstock of my 7x10 metal lathe, $60. One with a straight shaft I use to hold taps, which I modified to work like the LMS die holder and slides on the LMS MT2 die holder shaft. I also purchased a full set of 19 metric ER32 collets for $55. The quality is not perfect but neither are either of my lathes. I find that I regularly use about half the set when making kitless pens. I rarely use my chuck anymore on my metal lathe, almost exclusively using the ER32 collets. I just use my 4-jaw chuck for diameters larger than 20mm, pin jaws on the wood lathe, and a 4-jaw independent adjustable chuck on the metal lathe I can adjust to minimum run-out.

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