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Spindle threads damaged by chuck

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Forum topic by SpaceCadetWW posted 02-06-2019 03:43 AM 483 views 0 times favorited 5 replies Add to Favorites Watch
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SpaceCadetWW

6 posts in 1408 days


02-06-2019 03:43 AM

Topic tags/keywords: lathe spindle chuck repair

I have a Laguna 18/36 lathe (about 3 yrs old), and the threads on the spindle were recently damaged when removing the chuck. What’s odd is that I’ve had this chuck basically the entire time. I’ve put it on and take of 100’s of times by now, and suddenly it seemed as though it wasn’t the right thread count or something. The threads on the chuck seem okay, but the spindle threads were severely damaged.

Has anybody had an issue like this before, or know what might have caused it?

Let me know if you need any additional details.

Thanks!


5 replies so far

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TheDane

5695 posts in 4200 days


#1 posted 02-06-2019 03:51 AM

Do you have a set screw in the chuck? You can really wipe out the spindle threads if there is.

-- 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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Kelster58

759 posts in 1077 days


#2 posted 02-06-2019 04:05 AM



Do you have a set screw in the chuck? You can really wipe out the spindle threads if there is.

- TheDane

Wow, that’s just a really good thing to think of and some thing I would do to the threads on my spindle. I’m going to go right down stairs and look at my chuck to verify where the set screw is before I throw it on my lathe with out thinking. You people on here are so smart. Thanks for the post Spacecadet and thanks for the great thinking TheDane!

-- K. Stone “Tell me and I forget, teach me and I may remember, involve me and I learn.” ― Benjamin Franklin

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SpaceCadetWW

6 posts in 1408 days


#3 posted 02-06-2019 04:34 PM



Do you have a set screw in the chuck? You can really wipe out the spindle threads if there is.

- TheDane

My chucks do have a set-screw but I think I ruled that out. It’s definitely possible I screwed that up though. (Pun definitely intended) I’ve never used the set-screw, but it’s possible it’s worked it’s way down over time and just got to the point where it was hitting the threads.

I appreciate the suggestion, I’m going to check out and see if it could be that after all.

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SpaceCadetWW

6 posts in 1408 days


#4 posted 02-07-2019 03:43 PM

Turned out it was the set screw after all. I had ruled that out because I didn’t make any adjustments to it after putting the chuck on, but I guess it somehow worked it’s way down a bit after using it for a few days. Anyway, thanks so much for the help!

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TheDane

5695 posts in 4200 days


#5 posted 02-07-2019 04:50 PM

I teach in a studio with 12 lathes … each has a full set of tools, including chucks, but nary a set screw to be found!

We pulled all the set screws and hid them in the instructor’s office to prevent the very problem you ran into.

The only reason to use the set screws in chucks is for turning in reverse (usually for sanding pieces on the lathe). Otherwise they do more harm than good.

-- 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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