On 14 Jan 2018, at 19:44, Les Newell wrote: > I bought some Chinese BT30 and BT40 ER32 collet chucks off eBay a while back > and was pleasantly surprised by how accurate they were. The finish looked > good on all surfaces. I bought one before buying the rest and measured the > bore when fitted in the spindle. My tenths dial gauge hardly moved. When I > got the rest they were all pretty close. The nuts on the BT30 chucks are a > pain though. The bit that locates in the groove on the collet is concentric > instead of being offset. This makes it a real pain to get the collets back > out. Those ones are for my router and will spend most of their lives with > 1/2" collets so I'm not that concerned. > > Les > I have noticed that even good quality collets for expensive routers are tricky to get back out of a nut, once inserted. The ELU ones are held pretty securely, and the Kress ones are jolly difficult to get back out. Maybe that's why Kress try to sell each collet with its own nut.
Marcus >> >> There are a few reviews of Chinese collet chucks on youtube. The two >> I've seen measure chuck internal taper runout similar to your >> experience, Gene. (The outside's OK, but the bit that counts is poor.) >> Once one of the Chinese collets is inserted, all bets are off, and it's >> best for woodworking. >> >> One review showed one of the ostensibly ER32 collets in the set was over >> 33mm in diameter, and couldn't be inserted in the nut in half a minute >> of wrestling. >> >> Another video shows a Chinese collet chuck's internal taper being >> ground. Nowhere have I seen anyone use one as-is. >> >> It appears to be best to remember how _much_ cheaper they are, and then >> consider why. I wouldn't buy 'em, except as a kit to grind to tolerance, >> chucking out the collets beyond rescue. >> >> To attempt a rescue, maybe skim the chuck internal taper, then hone it? >> The chances of making it worse are slim. If it works well, there's a >> very handy youtube video in it. >> >> Erik > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
