Replacing Shopsmith Drill Chuck

JPG · Post by **JPG** » Tue Oct 06, 2009 8:27 am

[quote="tsaguy"]O-k, I think I may have figured it out.

Someone asked a question about the wobble at the end of the drill bit compared to closer to the chuck itself]

This does not add up! Any 'wear' caused by rubbing against the tool rest would be 'all the way around' and NOT cause 'wobble'.

Is the 5/8" bore still round? Can you make it wobble on the ss shaft with the set screw untightened?(wobble, NOT spin or move in and out which Would be expected)

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tsaguy · Post by **tsaguy** » Tue Oct 06, 2009 10:07 am

JPG40504 wrote:This does not add up! Any 'wear' caused by rubbing against the tool rest would be 'all the way around' and NOT cause 'wobble'.

It does add up if a user previously tightened the tool rest up hard against the chuck. This would place it 'out of center'. Wear may be all around the chuck itself, (which it is) however the 'release point' of when it was noticed will be the begining of wobble. It doesn't matter at this point if it adds up or not, it truly is the drill chuck that is out of center. other items atatched to the turning shaft are not out of 'round' or out of 'center'.

JPG40504 wrote:Is the 5/8" bore still round? Can you make it wobble on the ss shaft with the set screw untightened?(wobble, NOT spin or move in and out which Would be expected)

Another anomaly I have noticed though is there seems to be some sort of 'filler' material poured into the knurled portion of the turning shaft, just left of the flat-spot on the shaft itself, where you normally attatch a tool (chuck, disk sander, saw arbor). The filler material appears to cover up a set screw, but having never seen another SS, I don't know what it might be. Somewhat difficult to explain, I'll post pics later this afternoon.

The bore of the chuck is not wobbly, nor is the shaft wobbly.

I appreciate all the help I can get, my huge fear is that I would have to send my whole power-unit back to SS. Not sure if I want to be without it for that long, I turn on my lathe at least 5 nights/week...

BigSky · Post by **BigSky** » Tue Oct 06, 2009 10:53 am

I know that I have trouble following along but I am real lost on this one. The discussion began with the drill chuck and seems to be ending with a power head replacement.

Does the drive shaft wobble right at the headstock or only after a chuck is attached?

Either way you would not have to send the power head back. At most you might need a new quill but it seems to me that a proper chuck is the solution.

What is it that I am missing?

tsaguy · Post by **tsaguy** » Tue Oct 06, 2009 12:26 pm

BigSky wrote:I know that I have trouble following along but I am real lost on this one. The discussion began with the drill chuck and seems to be ending with a power head replacement.

Does the drive shaft wobble right at the headstock or only after a chuck is attached?

Either way you would not have to send the power head back. At most you might need a new quill but it seems to me that a proper chuck is the solution.

What is it that I am missing?

I brought up the fact of replacing the power head back in the case that the wobble problem could not be isolated to a specific part (drill chuck).

The quill does not display a wobble, even at full extension. (in case that would matter)

the drive shaft does not wobble. The chuck does.

JPG · Post by **JPG** » Tue Oct 06, 2009 5:01 pm

tsaguy wrote: . . . The chuck does.

I take this to mean the body of the chuck wobbles. This would infer the bore is not cylindrical. This would clinch the need for a different chuck.

You yourself have eliminated the quill shaft and headstock, so further mentioning of it only confuses folks at this point.

IF the aforementioned rubbing against the tool rest has indeed caused the inside of the chuck bore to wear in a fashion to increase the diameter of the bore near the 'end' of the quill shaft, it would cause wobbling as you have described. It would simultaneously cause the main body to wobble also.

The 'filler' in the knurled portion of the quill(bearing retainer!) is normal. SS does not want folks removing it unless they know what it is there for and how to 'put it back'. The filler serves the same purpose as that over the quill quide set screw on top of the headstock. It serves to avoid accidental loosening.