Centec with Clarkson Collet

[Steve Taylor 2Participant @stevetaylor2]

I have a Centec 2A with the vertical attachment and the small Clarkson autolock collet.
As I have a full set of ER25 collets for a dividing head I would like to swap out the clarkson collet holder and fit an ER25 collet holder.

They are both 2MT fitting but the clarkson dosnt want to come out.
I’ve heard of these being extremely tight, however I’m told it should come out
with persistent hammering of the drawbar.

I have heard the damping ring on the collet holder needs to be slackened also.

I beat the living daylights out of it using a lump hammer with a copper bar on the drawbar, no luck.

For the moment I have given up, all the hammering has somehow moved the spindle and I now have endshake of a couple of mills that I cant adjust out.

Anyone help please? Anyone in the North West?

[Steve Taylor 2Participant @stevetaylor2]

[Steve Taylor 2Participant @stevetaylor2]

The head spent 2 hours in the oven at 60c then I froze the chuck with the freezer spray used by plumbers and after 40 blows onto a copper bar I gave it a final blow directly onto the drawbar and out it came.

Now I can finally look at getting the sheared drawbar out of the chuck! New thread started

[IanHParticipant @ianh]

Hi,

 

I had a Centec with a Clarkson Autolock chuck – if by the “damping ring” you mean the large diameter threaded collar on the collet chuck, that buts up against the bottom of the spindle then I recommend that you use this to extract the chuck from the spindle. My method was (first of all not to overtighten the thing in the first place!) – loosen off the draw bar by about 1/8″ leaving it engaged in the chuck body. Now with a peg spanner on the damping ring and an open ended spanner on the flats on the spindle, use the “damping ring” to pull the collet chuck out of the taper. The damping ring has a fine thread so not much effort is required. When it frees, the chuck will drop but ony as far as the draw bar will let it. Put the spanners down and spin the draw bar free whilst you hold the chuck with the other hand.

 

Ian

 

 

[Author]

Posts