Collet Usage Tips Cutting tools should be inserte...

Collet Usage Tips

Cutting tools should be inserted into the Collet the full length of the bore wherever possible. Failure to insert the cutting tool into at least 2/3 of the bore may distort the collet. Collets should be cleaned and oiled prior to storage, RD Collets alias ER Collets must be tightened correctly. Many machinists have been trained that nothing is ever too tight. This is particularly not true with collets and collet chucks. 

Over tightening a collet chuck will distort the collet and actually diminish the holding strength and accuracy. Maximum tightening torque for RD Collets also known as ER Collet Systems is as follows

ER Collet Size - Max. Tightening Torque (ft. lbs.)
ER11 Collet - 20
ER12 Collet - 20
ER16 Collet - 40
ER20 Collet - 60
ER25 Collet - 70
ER32 Collet - 80
ER40 Collet - 90

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