Collets for Mill/Drill

Let's add another for er32 , you don't have to reach up top to change the collets or tooling . I say that because from a wheelchair ITS easier.
 
One final advantage of the TTS system is that there is a precisely reproducible z axis reference. For a properly prepared spindle face (see Tormach white paper), Tightening the R8 collet draws the shoulder of the TTS tool holder tight to the spindle face for excellent repeatability. In contrast, an R8 collet will draw the tool in as the collet is tightened. The tool will have to be re-referenced each time it is installed. Even an R8 end mill holder will change the z axis position slightly with tightening which is why sme shops use a torque wrench to tighten.

For me, this is the biggest advantage as it permits me to load up tools and pre-reference them. I use the Tormach surface plate and digital height gage to externally set up all my tool offsets. I have digital dial indicator which is mounted in a TTS holder and I make one reference measurement when I set up my work. That measurement is used to calibrate the height gage. If I need to replace a tool, I install the new tool, set the offset with the height gage and I'm good to go.
 
This thread is just what I needed to see, as a new guy who has had a endmill slip while cutting.
Thanks for letting me join..Doug
 
Experiences vary and anything that can happen, probably will happen. I've had end mill holders slip enough that I avoid them in preference to an ER chuck that has never slipped. A collet will also grab concentrically, while an end mill holder will always be a tiny bit off center by the amount of clearance in the holder. For most jobs, this is not an issue but when you need accuracy (like cutting key slots) then it does matter.
 
Experiences vary and anything that can happen, probably will happen. I've had end mill holders slip enough that I avoid them in preference to an ER chuck that has never slipped. A collet will also grab concentrically, while an end mill holder will always be a tiny bit off center by the amount of clearance in the holder. For most jobs, this is not an issue but when you need accuracy (like cutting key slots) then it does matter.

I have often wondered about this. Thanks Mikey.
 
I too was contemplating this recently, an ER chuck with R8 shank avoids investing in a bunch of R8 collets that are only useful on the mill,
while the ER collets are handy in many situations.
 
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