Self-ejecting chuck keys Y/N

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Packard V8
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Self-ejecting chuck keys Y/N

Post by Packard V8 » Sun Jun 10, 2018 2:43 pm

There are two classes of machinists - those who've forgotten to remove the chuck key and had it thrown at them and those who've been hit by one.

Having said that, I don't remember ever owning one of those spring-loaded-self-ejecting chuck keys. Some have an external spring.

Image

and some have an internal spring covered by a sleeve.

Image

Those of you who've used one, what are the negatives that keep them from being universally used. Slight extra cost is one. Convenience?

What are your thoughts?

jack vines

Magicniner
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Re: Self-ejecting chuck keys Y/N

Post by Magicniner » Sun Jun 10, 2018 4:25 pm

They're primarily a tool to protect manufacturers from the stupidity of the users of their products.

I have my chuck keys on swivels on tool balancers :D

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SteveHGraham
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Re: Self-ejecting chuck keys Y/N

Post by SteveHGraham » Sun Jun 10, 2018 4:43 pm

They are hateful to use.
Every hard-fried egg began life sunny-side up.

John Hasler
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Re: Self-ejecting chuck keys Y/N

Post by John Hasler » Sun Jun 10, 2018 5:20 pm

I like the ones with the external spring. That makes it easier to get the spring off.

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SteveHGraham
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Re: Self-ejecting chuck keys Y/N

Post by SteveHGraham » Sun Jun 10, 2018 6:12 pm

Boy, that's the truth.

I might be able to tolerate springs if they weren't 3 times as strong as they needed to be. I don't want to have to exert myself just to keep a key in a chuck. A gentle reminder to remove the key would be sufficient.

I saw a good idea for drill chuck key retention. A guy kept his on a cord attached to something. If it took off, it couldn't go far.
Every hard-fried egg began life sunny-side up.

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SteveM
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Re: Self-ejecting chuck keys Y/N

Post by SteveM » Sun Jun 10, 2018 8:25 pm

I put a spring on mine. It's just a light spring, so it's not a pain to use like the one Steve referred to.

I don't find it to be an inconvenience.

Steve

John Hasler
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Re: Self-ejecting chuck keys Y/N

Post by John Hasler » Sun Jun 10, 2018 9:54 pm

Make a socket for the chuck in a convenient spot with a microswitch in it wired so that the lathe won't run unless the chuck is in the socket.

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NP317
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Re: Self-ejecting chuck keys Y/N

Post by NP317 » Sun Jun 10, 2018 11:45 pm

I have found the sprung self-ejecting chuck keys to be difficult to use.
Not to mention when they pop out of the chuck and ding the lathe ways by the chuck!

I don't use them. I simply NEVER leave keys in the chuck.
And I've never been hit by one.
~RN

Harold_V
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Re: Self-ejecting chuck keys Y/N

Post by Harold_V » Mon Jun 11, 2018 1:51 am

I've operated metal lathes since I was a young lad of about age 14. That gives me 64 years on machines. I worked in the trade for many years, and am still active in machining, albeit at the hobby level.
My opinion of a spring loaded chuck key is it has no place in my shop. I would find it totally offensive.

Why, you may ask?

There are times when I want my chuck key to sit in the socket. I have enough experience to know better than to start my machine with the key in the chuck.

I do not speak for anyone else in this issue. Each of us will do what we deem to be the "right thing" in order to safeguard operating our machines. Seek the level of protection that you find comfortable. There is no right or wrong. Just various preferences.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

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SteveM
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Re: Self-ejecting chuck keys Y/N

Post by SteveM » Mon Jun 11, 2018 9:01 am

John Hasler wrote:
Sun Jun 10, 2018 9:54 pm
Make a socket for the chuck in a convenient spot with a microswitch in it wired so that the lathe won't run unless the chuck is in the socket.
As you will have multiple chuck keys for different lathe chucks and tailstock drill chucks, you could make one that disconnects the power when ANY of them is removed.

Steve

earlgo
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Re: Self-ejecting chuck keys Y/N

Post by earlgo » Mon Jun 11, 2018 11:19 am

Packard V8 wrote:
Sun Jun 10, 2018 2:43 pm
There are two classes of machinists - those who've forgotten to remove the chuck key and had it thrown at them and those who've been hit by one.
My experience is of the #2 kind, both in surprise and embarrassment. :oops:
I have not left the key in the chuck and turned on the machine after the first time 60 years ago. My breastbone still hurts when I think about it.

--earlgo
Deja Poo - The feeling you have seen all this crap before.

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GlennW
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Re: Self-ejecting chuck keys Y/N

Post by GlennW » Mon Jun 11, 2018 11:46 am

earlgo wrote:
Mon Jun 11, 2018 11:19 am
I have not left the key in the chuck and turned on the machine after the first time 60 years ago.
Exactly! It should be a self correcting problem.
Glenn

Operating machines is perfectly safe......until you forget how dangerous it really is!

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