I’ve begun my shopping for a 0.8kW spindle and I’ve seen that they use ER11 Collets. Unfortunately they mostly come with metric size and I have mostly imperial size bits. I looked on Elaire and didn’t see anything for ER11 collets. Of course, I could be missing them - wouldn’t be the first time! Is there some other nomenclature for these or is there a reliable source for ER11 collets?
(flames will follow, but)
ER collets have a range. Do not use LARGER than nominal, but, depending on the make and precision grade, generally have a range of 0.5mm under nominal.
I bought my Uxcell ER-11 collets and collet nuts from Amazon. I mainly use 1/8", 3/16" and 1/4" collets for all my imperial bits, but I bought some PCD bits and some tapered ball nose bits and they are 4mm and 6mm. So, I bought 3mm, 4mm, 5mm and 6mm collets as well and have them in holders on my pegboard along with the wrenches. Yes, I could have done without the second set of wrenches, but then the holders would not have had the same look.
EDIT: I am told the Uxcell brand are not the best, and until I get a decent dial gauge, I won’t be able to measure the runout, but I am able to cut pretty fine lines with small bits (0.0090", 0.0100", 0.0150") with these collets without issue or an obviously wider line than the bit should be cutting.