End Mill Holders

 

You lose 10% of tool life
for every .0001" T.I.R. (runout)

 



Learn to check T.I.R. (runout)

What to Look For

  • I.D. hole tolerance is H5
    (Best in Industry)

  • Balanced to 10,000 RPM to save spindle bearing life

  • Taper ground to AT3 for maximum spindle contact

  • Each holder lab certified for dimensional accuracy


Choosing the right holder for the job
is key to your success

Endmill Holder Advantages

    • Great availability (wide variety of sizes to choose from)

    • Accurate (when manufactured to precision specifications)

    • Good rigidity of cutting tool & holder assembly

    • Economical (no collets or nuts to assemble)

Endmill Holder Disadvantages

    • Each holder can only hold 1 size cutting tool shank

    • Poor cutting tool life because of excessive runout caused by
      poor manufacturing – up to 60% worse than Techniks

    Techniks bore tolerance is to H5 standards
    to extend cutting tool life up to 60%!


The chart below shows the difference between manufacturers.
To ensure proper fit the toolholder bore always has a minimum and maximum size (tolerance) for each shank size (bore I.D.)

Tool Shank
Dimension
Minimum
Tolerance
Maximum
Tolerance
Techniks
H5 Accuracy
Others
H7
Others
H8
.0937
-
.118"
.00015"
.00039"
.00055"
.125"
.118"
.236"
.00019"
.00047"
.0007"
.25"
.236"
.394"
.00023"
.00059"
.00086"
.375"
.394"
.709"
.00031"
.0007"
.001"
.675"
.709"
1.181"
.00035"
.00082"
.0012"

Endmill Holder Maintenance

  • Keep bore, taper, spindle taper, and shanks clean. Dirt causes runout

  • Check T.I.R. periodically for wear

  • Replace holder if bellmouthing or excessive fretting is evident

  • Replace worn retention knobs to prevent toolholder from flying out of spindle during operation

Visit our toolholder guide for more information