RF Guy,RFGuy wrote: ↑Thu Sep 23, 2021 5:46 pm Agreed. That is why I am confused when he says that they "only made the 1/8" collet for the Milwaukee 5600 family as a market test because it is rarely used on CNC systems". IF they have an ER20 collet for 1/8" bits, then I had assumed I could buy this and add their 1/4" and 1/2" collets to it. In other words if they have an 1/8" ER20 collet AND an ER collet nut that fits Milwaukee then then 1/4" and 1/2" ER20 collets should fit too. However, it sounds like maybe they haven't made this a production version for the Milwaukee since it was a market experiment. If the spindle thread, ID and spindle depth match an ER20 collet in their catalog then it should work.
Edit: Reading posts after this, looks like you do now understand the difference, but leaving for posterity sake for some future reader.
You're still confusing true ER20 collets and nuts versus the very specific collet on the Milwaukee (or PC 7518 or whatever). Do not think of the collets that PreciseBits sells for other routers as being true ER collets, because they are not. They are different sizes and shapes to support very specific router models. PB is machining, or having machined, collets specific to each type of router that they presently support. As I said above, the only router that I'm aware of that can use an actual ER collet is the new SpinRite, in this case ER20.
Below is a pic of three different collets that I have. The one on left is a true ER11 (which the ER11 line has various sizes up to 1/4"). The middle one is a 1/2" collet from PB for my Hitachi router. The one on the left is a 1/2" collet, also from PB, for my PC 690. An ER20 collet would look very much like the ER11 but larger. I'll take another pic next week when I receive the SpinRite with its true ER20 collet.
Now, compare the pics above to the Milwaukee pic I pulled off the Elaire site:
And finally, a pic of ER20s:
See how the ER20s appear to have a different angle from the Elaires, not to mention straight sides vs the indented area. The ER20s also appear to have a different angle than my Hitachi and PC collets.
There are other types of collet standards, for example R8, Morse taper, 3C, 5C, all with different sizes and shapes.
What's a shame is that it has taken this long for any router manufacturer to embrace a standard size collet and nut.