11-25-2015, 10:38 AM
Hey guys id like to know what you guys get AND deem acceptable for drill chuck runnout ?
The mill I have is a PM932 . The two drill chucks that I was dialing in were both a Jacobs super duty ball bearing and an Albriech (sp) key less chuck . I did try many other chucks and collets to see if my observations repeated and or got better worse.
First id like to note that I did many runout checks and indication fix and checked everything soup to nutz. 1st inside diam than a R8 collet it self with drill rod if I can rem .001-.0025 is what the mill produced so thats what we have to start with.
this is still bothering me and I didn't post bc been tied up with other things .. did some runout checks a few weeks ago wanted to hear from you guys . Spent some time observing why .0025-.004 TIR was what I was getting and upon mounting and re mounting chuck their was so much variance ?
After several adjustments re cleaning fixin and even tapping drill chucks I was able to get TIR within . .002 ( this check was approx 1-3 down in z from surface of jaws). .. Now id say however if ya took out chuck and re installed back it went to .0025-.004 TIR AGAIN to me .0025 may have to be acceptable for a drill chuck but not any greater what is your thoughts on this ?? still don't make sense that's like .002 too much
JMHO I never though of checking my runnout on a BP every time I used good quality stuff it never dawed on me drill wasn't running true unless it was obvious
The mill I have is a PM932 . The two drill chucks that I was dialing in were both a Jacobs super duty ball bearing and an Albriech (sp) key less chuck . I did try many other chucks and collets to see if my observations repeated and or got better worse.
First id like to note that I did many runout checks and indication fix and checked everything soup to nutz. 1st inside diam than a R8 collet it self with drill rod if I can rem .001-.0025 is what the mill produced so thats what we have to start with.
this is still bothering me and I didn't post bc been tied up with other things .. did some runout checks a few weeks ago wanted to hear from you guys . Spent some time observing why .0025-.004 TIR was what I was getting and upon mounting and re mounting chuck their was so much variance ?
After several adjustments re cleaning fixin and even tapping drill chucks I was able to get TIR within . .002 ( this check was approx 1-3 down in z from surface of jaws). .. Now id say however if ya took out chuck and re installed back it went to .0025-.004 TIR AGAIN to me .0025 may have to be acceptable for a drill chuck but not any greater what is your thoughts on this ?? still don't make sense that's like .002 too much
JMHO I never though of checking my runnout on a BP every time I used good quality stuff it never dawed on me drill wasn't running true unless it was obvious