What Screw Would You Use?

What Screw Would You Use?

When would you put an 8X5 roller screw in a NCT3?

The 5mm pitch screw has higher shock resistance and lowers the load exerted on the tool. The 5mm pitch also allows the tap speed to increase because it travels farther with each rotation. All this is done without changing your ram speed. This is due to the type of material and the fact that the pitch is coarser than the regular tool.

The coarser pitch does limit you to an 80% hole depth of the 4mm design. The 4mm screw also has seen some improvements by being manufactured out of a more durable material to extend performance.  With a Vipros or Apelio you regain max material thickness because these machines have more stroke than other machines.

  1. When tapping 12-24 or 10-24 taps.
  2. When tapping rack rails, EIA rails. See fig # 14 in the manual. These tapped holes will be 10-32 or 12-24  http://www.starcase.com/eia_rack_rail.htm
  3. Increases tap life by reducing the tapping speed of the tap by 30% without changing the tapping speed.
  4. If a customer has a tapping tool and is constantly braking the overload system.

What screw to use in the NCT3.5

There are two screws that can be used: 12X5 or 12X6

  1. 12X5 screw will only be used in a Hydraulic or Servo ram machine if customer is going to tap 12-24, 1/4-20, 1/4-28, M6X.1.0
  2. 12X6 will always be used in a mechanical ram machine.
  3. Mechanical ram machine is limited by tap size and material type: CRS, HRS P&O, 12-24, 1/4-20, 1/4-28, M6X1.0 ALUM, Copper, Brass, 12-24, 1/4-20, 1/4-28, 5/16-18, 5/16-24, M6X.1.0, M8X1.25
  4. 12X6 screw for Hydraulic or Servo ram machine 12-24, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, M6X1.0, M8X1.25, M10X1.50

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