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Old 07-20-2004, 11:42 PM   #1
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Default ? about using a lathe

I got a good deal on a used cobra 2000 lathe and it is my first lathe..

I have an old trinity 12x2 diamond motor from about 7 yrs ago and figured I would practice on it...

my question is, how do you keep the armature from moving back and forth?

I noticed in the pics that the armature they use fits perfectly between the two blocks....
the one I'm trying to cut has at least 1/2" of play between them.

thanks for any info..
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Old 07-21-2004, 01:41 AM   #2
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Depending on the lathe's design, you can either add some shims to the armature to space it out, or adjust the blocks that the armature sits on.
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Old 07-21-2004, 02:01 AM   #3
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I put one shim on the pinion end of the armature to stop the plastic rubbing on the block, then put a pinion on and position it so there is no noticable endplay and still spins freely.
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Old 07-21-2004, 02:09 AM   #4
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Yes, I do something like that too. I just position the arm in the blocks & then put a teflon shim on the arm's output shaft, & then put a small pinion on top of that(& just LIGHTLY tighten the pinion down, don't push in on it when you tighten down the set screw, so it'll still spin smoothly), that does a good job of preventing the arm from scooting around when I'm cutting....
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Old 07-21-2004, 02:14 AM   #5
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so simple, yet effective...
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Old 07-21-2004, 02:26 AM   #6
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Also remember that on the cobra lathe, the slave motor must recieve "reversed voltage" to spin the arm being cut in the correct direction...........
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Old 07-21-2004, 10:24 AM   #7
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You could also use a pen cap to pin the armature to one side or the other.
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