scrapdaddy
Aluminum
- Joined
- Aug 10, 2006
- Location
- az
I get sooo peaved at people who overtighten everything! Please excuse me but I just need to vent here
One of the most common situations that I see is the cam-lok and top clamp waaay over tightened on turning tools. To me the habit of doing this is a sign of lack of understanding of mechanical concepts and lack of training.
I'm sick of worn out cam pins and stripped out hexes in all our tooling. Ruin my perfectly good hex wrenches trying to loosen some insanely tight bolt.
One of the common responses I get is "the insert will move if I don't get that tight" Or "It must have tightened itself up during machining"
Then I explain to them that the cam lock is there to merely LOCATE the insert in the pocket and the top clamp is there to keep it from falling out....that during heavy cutting with a DCLNR the cutting forces will force the insert harder into the pocket and the clamps are doing nothing.(The exception is reverse feeding during which DOC is so very minimal it makes little difference) They look at me like I'm crazy.
20 yrs ago a Kennametal rep gave us a class and explained that a DNMG 432 insert cam pin only needs 4 to 6 inch pounds of torque. A good way to guage this is to put your finger out on the end if the hex wrench and just when she starts to flex.... STOP!
This phenomenon goes well beyond tool holders on to about any nut bolt or fastener in the shop.
One of the most common situations that I see is the cam-lok and top clamp waaay over tightened on turning tools. To me the habit of doing this is a sign of lack of understanding of mechanical concepts and lack of training.
I'm sick of worn out cam pins and stripped out hexes in all our tooling. Ruin my perfectly good hex wrenches trying to loosen some insanely tight bolt.
One of the common responses I get is "the insert will move if I don't get that tight" Or "It must have tightened itself up during machining"
Then I explain to them that the cam lock is there to merely LOCATE the insert in the pocket and the top clamp is there to keep it from falling out....that during heavy cutting with a DCLNR the cutting forces will force the insert harder into the pocket and the clamps are doing nothing.(The exception is reverse feeding during which DOC is so very minimal it makes little difference) They look at me like I'm crazy.
20 yrs ago a Kennametal rep gave us a class and explained that a DNMG 432 insert cam pin only needs 4 to 6 inch pounds of torque. A good way to guage this is to put your finger out on the end if the hex wrench and just when she starts to flex.... STOP!
This phenomenon goes well beyond tool holders on to about any nut bolt or fastener in the shop.
