Delivery of the Elite Series Machines

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Bub,

if it’s your first ER collet, then you’ll have to know:

@Aiph5u

ER Collet Essentials. Do You Know? – Haas Automation Tip of the Day - Youtube

ER collets have a mark which has a purpose explained in the video.

Other holes can be are from balancing the collet nut.

See also:

@Aiph5u

ER collets are not mounted the way a trim router collet is mounted. Most people put the collet into the axle of the spindle and then they put the collet nut over it. That is definetely wrong! An ER collet has a groove that goes all the way around near the top of the collet. The corresponding collet nut of an ER collet has an excentric extractor ring or offset lip inside. It is absolutely mandatory to fully engage (clip in) the collet inside the nut before you tighten it onto the holder, as shown at this moment of the video “ER Collets | 5 Things to Know for Beginners” . See also this picture from my spindle manual:

– Source: Mechatron HFS Spindle User’s Manual

ER Collets | 5 Things to Know for Beginners - Youtube

ER Collet Essentials. Do You Know? – Haas Automation Tip of the Day - Youtube

The link jumps to the moment in the video where it is shown.