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Record SC4 Chuck question

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Forum topic by marcsitkin posted 07-11-2016 04:31 PM 256 views 0 times favorited 4 replies Add to Favorites Watch
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marcsitkin

19 posts in 224 days


07-11-2016 04:31 PM

Hi-

I just received a new Record SC4 chuck, which I’ve assembled and mounted to my Rikon 70-220 VSR Lathe. I started up at a medium speed and immediately noticed the whole lath was vibrating. No wood was mounted in the chuck. I checked the run out at the circumference of the chuck, and it’s got about .005” of run out.

Is it normal for a chuck to cause a lathe to vibrate? The lathe is as smooth as can be with the spur center mounted. The lathe is securely bolted to a very heavy stand.

-- Thanks, Marc Sitkin, Harwich, MA


4 replies so far

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TheDane

4997 posts in 3130 days


#1 posted 07-11-2016 04:47 PM

Is it normal for a chuck to cause a lathe to vibrate?

No. Just a WAG, but I would say you got a defective chuck.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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Wildwood

1887 posts in 1602 days


#2 posted 07-11-2016 07:42 PM

Would also check spindle run-out without chuck installed. If that’s okay, would remove threaded insert and reinstall making sure torched down evenly.

If still have a problem would ask for an exchange or refund of either lathe or chuck!

-- Bill

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JoeinGa

7489 posts in 1474 days


#3 posted 07-11-2016 08:40 PM

Also are the jaws clamped shut? If they’re partially open, might be a bit of movement causing unbalance

-- Perform A Random Act Of Kindness Today ... Pay It Forward

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marcsitkin

19 posts in 224 days


#4 posted 07-12-2016 04:02 PM

Bill-

Runout on the spindle with no chuck was about 1/1000”

Removed and reinstalled threaded insert, made no difference.

Joe- Jaws clamped shut, same vibration.

Vibration seems to be at around 1000 rpm, diminishes above and below that speed. Seems like it may be a harmonic situation.

I plan on getting a member of the turning club over to further investigate.

Thanks to all for your feedback.

-- Thanks, Marc Sitkin, Harwich, MA

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