Just Fit Sleeve

  • A sleve designed to improve the performance of MVX/TAF drills, allowing the cutting diameter to be increased in increments of 0.1mm
  • When intstalling on the drill shank the rotation axis of the drill is slightly decentered. It enables slight enlargement of the machinedhole. (enlargement range: 0.1-0.5mm)

Guideline for Selecting a Just Fit Sleeve

Desired = (Drill&+ Increase of JFS) + 0.1mm

(Eg.) Desired diameter is 20.3mm (oversize is taken as 0.1mm).

(Note) Oversize can vary due to the cutting conditions used, please use the above as a guideline.

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

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)

Application of Just Fit Sleeve

  1. When inserting the drill into the side lock holder, aligin the V groove on the outer peripheral edge of the drill flange, as well as 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 to the open window of the sleeve and fix the drill. Tighten screw B to a degree so as not to damage the sleeve.

(Note)
• Fine adjustments cannot be made for the diameter
• Cannot be used with collect chuck type holders.

Application of MVX Type Drill

Use on a Lathe

  1. The outer insert and machine X axis must be set parallel. The drill is designed so that when the drill center and the machine spindle center are aligned then the inner insert height is 0-0.15mm lower.
    *The inner insert may fracture if the center height of the inner insert is higher than the machine X axis.
Use on a Lathe
  1. By off setting it is possible to adjust the hole diameter. To do this adjust in the positive X axis direction (hole oversize direction). For the amount of possible adjustment please refer to the dimensions list.
    *It is not recommended to adjust in the negative X axis direction as this may lead to drill interference with the hole.
  1. 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.

Application of TAF Type Drill

  • 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.

  • 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 center.
  1. To adjust the hole diameter by of-setting the drill, the outer cutting edge and machine axis must be set parallel.
  1. 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.
  1. 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.