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1.popular tool holding system chuck, collet and clamping nut, 2.standard DIN6499B, 3.Made of special elastic steel material - details see: https://www.machineto.com/high-accuracy-milling-chuck-series-er-spring-collet-with-standard-din6499b-10157364

we suply high accuracy of er collets and machine tool parts ,

Made of special elastic steel material:65Mn

Hardness :HRC 44-48

The goods are most exported to taiwan,germany,Italy,spain braizl .and other regions

we supply the competitive price and good serviec ,

Sincerely cooperate with you .

welcome inquiring more information

The ER System is the most versatile tool holding system for any operation utilising a round shank cutting tool in a machining or turning center. This includes drilling, milling, tapping, reaming and boring. ER Collets are available in the following series ranges to maximise efficiency in most applications:

Series

ER8 1mm-5mm

ER11 1mm-7mm

ER16 1mm-10mm

ER20 2mm-13mm

ER25 2mm-16mm

ER32 3mm-20mm

ER40 4mm-26mm

ER50 10mm-34mm

The ER system is the only popular tool holding system in which all components (chuck, collets and clamping nut) are standardised by DIN 6499.

ER systems are truly interchangeable. All manufacturers of this system should conform to the DIN 6499 standard. This becomes important to users that may have tool holding systems from different tool holding system manufacturers.

As tools are taken out of the tool crib and reassembled for different jobs, if all the ER system components are in good condition, and are from quality tool holding system manufacturers, the collet and tool should achieve the DIN 6499 accuracy.

When using round shank cutting tools, collets and collet chucks centralise the cutting tool and this should result in increased tool life, higher feed rates, better workpiece accuracy and enhanced workpiece finish.

METHOD OF INSERTION & RELEASE FOR ER COLLETS

INSERTING RELEASING 1. insert collet into nut at angle as shown to engage extraction tongue in groove of collet. 2. Screw nut onto collet holder with collet securely in nut. 3. Insert tool to be gripped and lock nut. IMPORTANT: Never screw nut onto collet unless collet is properly seated in nut. Hold nut in vertical position and remove nut at an angle. Collet is automatically withdrawn from chuck by eccentric ring of nut when unscrewed.

The chuck, collet and nut must be thoroughly cleaned before assembling to maintain accuracy.

The collet must be installed into the nut (see assembly instructions) before engagement with the collet chuck to ensure the collet is seated into the 30 degree concave angle of the nut. Putting the collet into the chuck and then installing the nut will result in a condition that the eccentric ring of nut will engage only one side of the collet and produce poor results such as runout and drastically reduced holding strength.

ER Collets are designed to collapse 1mm (except ER8 & ER11 – collapse 0.5mm).

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.

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.

ER Collets are also very economical when compared with other popular collet systems. Collets work best when used at nominal or full diameter but when economy is desired this system compares very favourably with other systems.