A while back I bought a ER 32 collet chuck and collets for my Rockwell milling machine, for some reason, I’m still not fully sure why, I felt the need to buy a ER 20 Collet chuck and collets. I bought the collet chuck and collets from BangGood, I ordered them in mid April, got an email about 2 weeks ago, saying expect delivery roughly 6/17/20, they arrived on 5//28.
I ordered the collet chuck and 8 piece collet set, I got the collet chuck and a 14 piece collet set. The collet chuck seems well made, it had very minimal run out, when measured at the outside and inside of the collet taper. The collets look like and are packaged exactly like the ER 32 collets, I already had. Run out at the end mill shank was less than .001” (slight needle wiggle only)
So I decided to buy one of the ball bearing nuts, another set of collets and one of the collet nut wrenches,. All has arrived and at this point, all is well.
ER 20 collet chuck - $30
ER 20 collet set - $30
ER 20 ball bearing nut - $27
ER 20 Collet nut wrench. - $30
ER 20 collet set - $35
Total cost - $152