Just realized I've been over-tightening collets for years

Read a Haas tip sheet that said excessive torque on an ER collet nut can actually reduce grip by 40%. I found it in their maintenance guide PDF online. Anyone have a good torque spec chart they use for different tool holders?

2 comments

2 Comments

karen_perry386h ago

Well that's a fun new thing to worry about at 2 AM. So all this time we've been cranking down like we're trying to stop a leak, we were actually making the grip worse? Classic. Guess my "tighten it until it strips, then back off a quarter turn" method needs work.

bettys513h ago

Wait, you can actually make a grip worse by over-tightening? I always thought more force meant more hold, but that really changes how I'll handle things from now on. Guess it's time to learn a lighter touch.