How to avoid running into my chuck on power feed.

Just to chime in and give an alternative...

My power hacksaw has a plunger at the bottom of it's travel which activates a micro switch. The switch is wired into the fifth port of the No Volt Release switch thats used for the emergency stop button. You could easy rig up a carriage stop with similar. It won't stop immediately, of course, but will work perfectly well if placed with a bit of clearance before the worst happens.
 
Most importantly, the position of the saddle will not be the same for every crash. If your compound feed is at an angle towards the chuck, and fed forward, a collision will occur earlier. Any compensation mechanism you make will need to be adjustable to allow for this.
 
IF ( and that's a BIG if) your lathe has a clutch a stop could avoid a crash but it's a bad practice. If your lathe has no clutch a stop will break parts. What will you do when threading? The lead screw has no clutch. Much better if you just learn to pay attention and develop good habits at the lathe.
 
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