Lathe Chuck Key Interlock
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A lathe chuck key interlock, used to prevent lathe operation if the chuck key is not inserted
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- Printables
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- Tools
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This is a model for a chuck key interlock, for use on lathes to prevent the machine from running if the key is not inserted. An extremely easy mistake is leaving the chuck key in the chuck after making adjustments. Lathes can spin up extremely fast - 0-1800 RPM in a second, and any chuck key along for the ride will likely be ejected at a very high speed. This device is designed to mount two swicthes which are toggled when the chuck key is fully inserted.
The chuck key for my lathe has a good heft - I'll get a weight sometime - and a hunk of metal traveling at 105 MPH/172 KPH will leave a mark. It will likely leave several marks, or broken bones, shattered windshields and windows, walls, ceilings and roofs, but probably not floors as the angle seems difficult.
I was shocked that these weren't standard equipment on lathes, but they didn't seem to exist either. I never found one looking through dozens of vendors and distributors while assembling parts for a VFD conversion, which is a full rewire, and a great time to design and add one. The design has holes for two m4 inserts and indexing holes for two switches to mount, specifically the ECX1040 (SPST/NO) and/or the EXC1030 (SPST/NC) from AutomationDirect. Two switches can be mounted directly and interact with the key if needed, and multiple switches can be stacked for additional configurations.
I used a single ECX1040/green, so the key had to be inserted, and would generally fail safe if damaged or a line was cut. (The the model uses a ECX1030/red.) Several interlock switches using the green/NO switches can be wired in series if multiple sizes are required - any one missing would prevent operation.
The current version is static and uses the chuck key from my lathe, a PM1440TL, as the reference with direct measurements. I will parameterize this chuck key and subsequent holder. Mounting is custom to a lathe and how the chuck key will be inserted, and additional modeling is required to match your key and mounting location.
Use at your own risk.