ER 40 Collet Chuck Runout

[WobblyHand]

that is what I have been measuring--the taper.

Can you show a picture of how you are measuring the taper? The R8 section is locked down, correct? And the ER chuck is empty, without the nut? And you are simply using a DTI to measure TIR of the ER taper? And you are rotating the spindle by hand? Sorry for the elementary questions, but it's important to unravel the puzzle.

 

[weejax]

Can you show a picture of how you are measuring the taper? The R8 section is locked down, correct? And the ER chuck is empty, without the nut? And you are simply using a DTI to measure TIR of the ER taper? And you are rotating the spindle by hand? Sorry for the elementary questions, but it's important to unravel the puzzle.

yes to everything above

 

[weejax]

I made some videos for the glacern guys--they ended up giving me a refund

this is one of my R8 collets w and end mill, just for reference

r8 1/2 em.mp4

drive.google.com

this is the glacern ER40

glacern er40.mp4

drive.google.com

and with my drill chuck and an end mill

drill chuck.mp4

drive.google.com

and finally the spindle itself

mill spindle.mp4

drive.google.com

 

[WobblyHand]

I made some videos for the glacern guys--they ended up giving me a refund

this is one of my R8 collets w and end mill, just for reference

r8 1/2 em.mp4

drive.google.com

this is the glacern ER40

glacern er40.mp4

drive.google.com

and with my drill chuck and an end mill

drill chuck.mp4

drive.google.com

and finally the spindle itself

mill spindle.mp4

drive.google.com

FYI, your link (at least for the Glacern ER40) require your approval. They are not open links. If that's what you intended, that's fine.

 

[weejax]

sorry, i think this fixed it

spindle

mill spindle.mp4

drive.google.com

R8 Collet w end mill

r8 1/2 em.mp4

drive.google.com

Drill chuck w end mill

drill chuck.mp4

drive.google.com

Glacern ER 40

glacern er40.mp4

drive.google.com

let me know if this doesnt work please

 

[weejax]

Final update--ordered an ER40 chuck from little machine shop. .0002 TIR on inside face. Good enough for me.

 

[GrifterGuru]

That is good news @weejax

Good to know, also, that LMS ER40 are as good as they should be.