Help with a collect chuck

[ian HoldsworthParticipant @ianholdsworth27760]

I have purchased some second hand tools. In them is a Milling machine collect chuck.

There are a number of different collects and are interchangeable, well they would be if I could extract the existing collect! It has a large lipped washer in the chuck body. It is fixed and locates on the grove in each collect. How do I extract and change the collect. Photos herewith. Do you know how to do this or the manufacturer of the chuck?

[JasonBModerator @jasonb]

You need to tilt the collet to one side then it should snap out

[Ian ParkinParticipant @ianparkin39383]

just grasp the collet and twist it to one side axially then it should fall out..when its out you will see how it fits

[noel shelleyParticipant @noelshelley55608]

It’s of the ER type, in this case an ER25, Jason has shown how it works.  Noel.

[bernard towersParticipant @bernardtowers37738]

Bearing in mind that the nut needs to be twisted at the same time to get to the position that allows the collet to release easily.

[old martParticipant @oldmart]

Press the collet in every direction until it tips and then you drop it. The collets must be snapped into place before screwing the head on the arbor.

[old mart]

On old mart Said:

Press the collet in every direction until it tips and then you drop it. The collets must be snapped into place before screwing the head on the arbor.

I’ve lost count of how many times a tool problem turned out to be a collet NOT fitted properly to the nut….

 

Jimb

[DiogenesParticipant @diogenes]

If not clear from above replies, the hole in the washer is eccentric – you might be able to see which is the ‘low’ side by looking inside..

[SillyOldDufferModerator @sillyoldduffer]

The usual first-encounter problem with ER collets is failing to click them properly into place during installation.   Jason’s diagram shows the collet and tightening ring are both removed from the chuck to do this.  Stage A shows the collet goes in at an angle and pops into place.  You can’t just drop the collet straight into the ring and have it click correctly into position when the ring is tightened in the chuck.

As Jason explains, removing is the reverse: the collet is popped out by tilting and pushing, as shown in Stage C.

Easy when you know how, but not obvious.   Some do it intuitively.  Had me confused for about 10 minutes before I twigged.  Others have to ask.

Bonus hint. ER tightening rings come in two forms.   The rings fitted with a ball-bearing are easier to tighten and undo: worth buying.

Dave

 

[JasonBModerator @jasonb]

As I mentioned in a thread a few weeks ago about ER Collets, if you mark your nuts where the eccentric lip is closest to the hole you don’t need to waste time rotating to try and find the spot where the collet tilts. Just tilt towards the mark whether inserting or removing. This 6mm ER32 snaps in & out easy enough when you know which way to tilt it.

[John HaineParticipant @johnhaine32865]

<p style=”text-align: left;”>Dave I assume that by tightening ring you mean nut?</p>

[ian HoldsworthParticipant @ianholdsworth27760]

Thanks. All is well and I have iy out and a different one in. Thanks so much for the help!!

[old martParticipant @oldmart]

It will seem so easy once you have got the things clicking in and out.

I bought a couple of the ball bearing nuts which are first choice for er collets, only they have to be turned further to take up the slack.

When changing any size er collet tool in a vertical mill, it pays to have a cloth catcher under the endmill or drill, they can fall out of the collet and chip on the bed or even bounce onto the floor.

[John Haine]

On John Haine Said:

<p style=”text-align: left;”>Dave I assume that by tightening ring you mean nut?</p>

I do, sorry about that – I’m not on top form and misremembered the name.

Dave

[MacolmParticipant @macolm]

When fitted correctly to the nut, the collet will loose enough to be rotated in the nut without resistance.

[John HaineParticipant @johnhaine32865]

When I bought my s/h Novamill, ex-school, the last user (I suspect the teacher) hadn’t fitted an ER16 collet correctly so it wasn’t fitted in the eccentric ring.  Then he’d tightened the nut until it finally gripped, then probably found out that he couldn’t change the tool and left it like that.  I doubt his pupils got much useful instruction!  It was the devil’s own job to remove the nut and collet.

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