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External dimensions as per 'ER' Collets DIN - 6499.
'T' stands for tension or expansion.
'ERT' has no compression,so it has always rigid start.Best suitable for depth control in tapping.
This is available in 16,20,25,32,40,&50 sizes.To be used with standard 'ER' Collet chucks.Need not to have any special Holding device.
This system is to be used along with 'ER' Collet chucks on CNC machines & SPM's Recommendations
Rapid approach,then feed the Tap with approximately 95% of the pitch value,this gives positive start to the Tapping.This uses 20% to 30% of the compensation stroke.
When the spindle rotation & the feed movement are simultaneously reversed.Return feed must be made 100% of the pitch value.Which maintains the sleeve of the tapping collet in the expansion stroke upto the Tap disengagement.When Tapping with very high speed , an appropriate programming,compensation may be necessary to balancethe differences of inertia between the spindle & the feed movement on reverse.Never disturb the axial compensation.Use internal coolant supply only.
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