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Old 02-24-2024, 12:19 PM
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Scotts Scotts is offline
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Default Trapped key repair

Had a little project come across and just a quick fix.

This is a trapped key safety system on a machine, The master key controls the switch to not allow the doors for the part that rotates to be open until 120 seconds have passed. This allows the piece of equipment to come to a stop before you can access the spinning parts.

3 of the keys travel from this box to the doors, which involves climbing up steps and ladders to get to. the keys are made of chrome plated brass near as I can tell and are fairly soft and they have some weight to them. They hit the concrete floor and they can deform enough to not go int the lock.

I whipped a mandrel on the lathe to reform them back to round again.

1 what it looks like working properly

2 bent key

3 where the key goes the center piece turns. The walls of key slide between the ID of outside and OD of inner piece. the bends keep the key out.

4 is the mandrel I made out of some hard bronze from the neighbors pile of opportunity. He does airplane parts.

5 I pressed the key over the mandrel with the tailstock.

6 A few taps with the plastic hammer to remove.

7 I flipped the mandrel over and faced off the back side.

8 all keys in and working properly. mandrel is on the cover.

Scott
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  #2  
Old 02-24-2024, 09:49 PM
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Good thinking!! well done
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Old 02-25-2024, 07:33 AM
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greywynd greywynd is offline
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Nice work. Even though it can often be perceived as a pain in the ass, safety mechanisms like this are still important. If or when they don’t work properly (like your bent keys) is often when people really get frustrated and try to bypass the system(s).


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Old 02-25-2024, 10:26 AM
Lew Hartswick Lew Hartswick is offline
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A hole in the "grip" a lanyard or loop to hang on a wrist to prevent dropping on the floor would be appropriate I think there :-)
...lew... (Prevention is worth a lot more that repair) or something like that :-)
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Old 02-25-2024, 11:21 AM
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Quote:
Originally Posted by greywynd View Post
Even though it can often be perceived as a pain in the ass, safety mechanisms like this are still important.
OSHA (or CAN-OSHA) still sucks!
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