I Need Some ER40 Collet Wisdom...

[Richard Tymko]

What am I missing here? One fits and one does not. Bought these for my PocketNC. Can someone educate me?

Is one not an er40?

Thanks,

Richard

 

[PeterT]

That is interesting. Are those pins in the slit? I've seen pictures of machinable collets. I think the general idea is you machine custom bores/features to fit production parts with the pin in so its stabilized. Then remove the pin so it has free clamping action. That one has fewer slits although that maybe be by design since machinable would be for much more limited clamping contraction size range.

 

[Richard Tymko]

That is interesting. Are those pins in the slit? I've seen pictures of machinable collets. I think the general idea is you machine custom bores/features to fit production parts with the pin in so its stabilized. Then remove the pin so it has free clamping action. That one has fewer slits although that maybe be by design since machinable would be for much more limited clamping contraction size range.

Those pins that you see are rubber. Maybe for vibration dampening?

 

[Brent H]

looks like those pins are keeping it held at the full size it is bored to so it doesn't click into the collet holder all the way? can you give it a nudge towards sitting properly? Might be a bugger to extract?

 

[Richard Tymko]

looks like those pins are keeping it held at the full size it is bored to so it doesn't click into the collet holder all the way? can you give it a nudge towards sitting properly? Might be a bugger to extract?

The collet is actually too small and doesn't sit flush.

Photo 5347 is the correct sitting for the collet which allows me to tighten the collet nut compress the collet . Photo 5438 shows the collet sitting too low and can not be clamped down to tighten the collet.

Just found out that the second collet maybe a sealed collet for thru tool coolant? If so, why would it be smaller?

 

[Janger]

Are you putting the collet in the nut correctly?
See
https://www.rangate.com/products/er40-spring-collets

 

[Richard Tymko]

Are you putting the collet in the nut correctly?
See
https://www.rangate.com/products/er40-spring-collets
View attachment 7278

That is a good question, fortunately for me my collet chuck has a housing that the collet sits in and the collet nut just screws on top to create the compression.

 

[Richard Tymko]

So what I have is a Rigid Tap Collet which apparently has a slightly different footprint than an er40 spring collet. Good to Know, Unfortunately will not work on my PocketNC.
The PocketNC has a maximum torque of 12 inch pounds (1 foot pound), the torque spec for an ER40 collet for tool holding is 100-130 foot pounds... way out of my league.

Anybody want to buy some rigid tap collets?