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Thread: rf30 spindle wobble
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10th Jul 2011, 05:57 PM #1future machinist
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rf30 spindle wobble
I just got a collet chuck for my mill and I measured the spindle runout it was 0.45 mm how can i correct this?
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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10th Jul 2011, 06:04 PM #2
Where did you measure the run out? That is a lot of run out.
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10th Jul 2011, 06:20 PM #3Distracted Member
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If it really has that much runout, send it back. But first you need to be sure you're measuring properly. Put an indicator directly on the taper where the collets seat. Note reading. Remove and clean mating surfaces really really carefully. Look for and remove any dings or burrs while you're there. Then retest. Let us know.
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10th Jul 2011, 08:01 PM #4Most Valued Member
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If the spindle is not damaged after you have checked its runout,the problem would more than likely be in the collet chuck.
If the spindle is damaged and you cant find a replacement and you need to use it,you first need to know if this runout is in the same spot each time.
If it is in the same spot each time you can shim the morse taper to get it to be running almost true,you may with persaverance get it running true but try for .002/.005".
It wont matter that the M/T is not seating correctly as the draw bar will hold it.
I would either use brass or stainless shim or a soft drink can,you will have to sneak up on it.
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10th Jul 2011, 08:38 PM #5future machinist
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okay i re measured the spindle this time i measured inside the taper with a dial test indicator and it came to .04 mm i then measured the runout on my new ctc collet chuck it came to 0.38.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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10th Jul 2011, 08:51 PM #6Most Valued Member
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Mount the collet chuck in your lathe spindle if its a M/T3,take the nut off and place a bit of softwood or similar on the front to protect it,give it a tap with a hammer to seat it and double check the runout.
If its a M/T 2 take the nut off and hold the chuck body in your 3 jaw,wont matter if the 3 jaws out as long as it is less than your .38mm,now check the runout on the M/T.
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10th Jul 2011, 09:24 PM #7future machinist
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Well i think my main problem was the taper seating or perhaps the collet. I measured the chuck runout in the lathe taping it to seat it properly the runout was 0.07 mm i think put it back into the the mill and this time i taped it in to seat it properly and the runout came to 0.09 mm
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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10th Jul 2011, 09:27 PM #8
Are you using a drawbar? If not, you really should use one when you are using the chuck with tooling to mill things.
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10th Jul 2011, 09:32 PM #9Most Valued Member
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Now that you have reduced the runout in the mill take the chuck back out and put it back again,BUT dont tap it to seat,just nip it up with the draw bar if you have to.
If it goes back in with just a lift of the wrist,rotate the spindle by hand and check it again.
From what you have said it seems that there may of been a dag in the M/T bore.
If by some chance there was and it got pulled in with the chuck it may have left a dimple in the spindle bore,try and check it if you have clear access to it,maybe even use a mirror,if there is something there you will need to get rid of it.
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10th Jul 2011, 09:33 PM #10future machinist
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I dont have a draw bar but i will make one up tomorrow when i can get some all thread.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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10th Jul 2011, 09:33 PM #11Most Valued Member
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10th Jul 2011, 09:35 PM #12
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10th Jul 2011, 09:37 PM #13Most Valued Member
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10th Jul 2011, 09:39 PM #14
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10th Jul 2011, 09:41 PM #15Most Valued Member
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Bit like a car wont start,go through some ideas and then find out they havent got a key.
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