MITSUBISHI MATERIALS CORPORATION
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JUST FIT SLEEVES [JFS]

GUIDELINE FOR SELECTING A JUST FIT SLEEVE
Desired = (Drill Ø + Increase of JFS ) + 0.1mm
(Eg.) Desired diameter is 20.3mm (oversize is taken as 0.1mm).
Formula
(Note)
Oversize can vary due to the cutting conditions used, please use the above as a guideline.
<Tool Selected>
TAF Drill
: TAFM2000F25
Just Fit Sleeve [JFS]

: JFS3225-20

ORDERING THE JUST FIT SLEEVE
Purchasing Method 1
Oversize can vary due to the cutting conditions used.
Therefore it is recommended to purchase as a set.
When placing an order, please use the Set order number. (5 sleeves/set)
Purchasing Method 2
It is possible to order individually. When placing an order, please use the individual order number.

APPLICATION OF JUST FIT SLEEVE
  1. When inserting the drill into the side lock holder, align the V groove on the outer peripheral edge of the drill flange, the round holes of the outer peripheral edge of the sleeve flange and the screws of the side lock holder for fixing the drill. (If the drill does not have a V groove, align the notch of the drill shank with the round holes of the sleeve.)
  2. Insert screws A of the side lock holder directly through the open window of the sleeve to clamp the drill. Tighten screw B only to a degree that does not damage the sleeve.
(Note)
  • Fine adjustments cannot be made for the diameter of the sleeve.
  • Cannot be used with collect chuck type holders.
Just-Fit Sleeve

APPLICATION OF TAF DRILLS
  • Please ensure the highest rigidity possible exists in both machine set up and workholding.
  • Refer to the following graph for coolant pressure and volume. Coolant is an important factor in the efficient use of these drills.
    Coolant pressure and Discharge volume
  • Cannot be used for stack drilling.
    In common with many indexable insert drills, these drills produce a round disc on exit which unless evacuated may cause the drill to fracture.
  • Use on a Lathe
    1. The inner cutting edge must be positioned between 0-0.2mm over centre.
      Use on a Lathe1
    2. To adjust the hole diameter by off-setting the drill, the outer cutting edge and machine axis must be set parallel.
      Use on a Lathe2
    3. When producing an oversize hole. The drill offset should be no more than 2% of the diameter. It is not possible to produce an undersized hole.
    4. When through hole drilling on a lathe the disc produced by the drill exiting the workpiece may be expelled at high velocity.
      To reduce the danger of injury or damage a cover guard is highly recommended.
      Lathe Usage4