Spurs and Miters | Schlumberger Products

Spurs & Miters

Nonself-locking mechanical advantage

Spur and miter gears are used in applications requiring a nonself-locking mechanical advantage or where a change in input drive orientation is required. Both devices can be used as add-on features to our worm and bevel gears or can be purchased as stand-alone products.

Spur gear features

  • Heavy-duty iron and steel components
  • Used with worm gear and bevel gear operators for reduced handwheel sizing and handwheel rim pull effort
  • Can be used independent of worm and bevel gears with small nonrising stem gate and globe valves and other non-self locking applications that require torque multiplication. When used with small electric motor operators, it provides a low-ratio, nonself-locking torque multiplier
DYNATORQUE spur gear
Spur gear.
DYNATORQUE miter gear
Miter gear.

Miter gear features

  • Heavy-duty iron and steel components
  • For use as a close-coupled gearbox that changes handwheel input shaft direction on worm and bevel gears
  • Can be used to change shaft direction (90°) on any rotating device with compatible torque values and interface dimensions

Materials

Unit housings and covers are iron, gears are carbon steel and heat-treated carbon steel, shafts are carbon steel with yellow zinc coating, shaft seals are Buna-N rubber, housing-to cover seals are styrene butadiene, bushings are oil-impregnated copper nickel steel alloy, and bearings are tapered roller and needle type.

Miter Gears

Model Unit Weight, lbm Max. Output Torque, lbf.in Gear Ratio Turns for 90° Std. Output Shaft Std. Mounting Pattern
(Qty. and Size)
Std. Mounting Pattern
(Bolt Circle)
Mech. Adv.
MT1 25 3,000 1:1 1 Not applicable (4).406 1.250 × 2.250 0.9
MT1A 26 3,000 1:1 1 1.000 (4).406 1.250 × 2.250 0.9


Spur Gears

Model Unit Weight, lbm Max. Output Torque, lbf.in Gear Ratio Turns for 90° Std. Output Shaft Std. Mounting Pattern
(Qty. and Size)
Std. Mounting Pattern
(Bolt Circle)
Mech. Adv.
4:1 34 10,000 4:1 4 Not applicable (4).406 1.250 × 2.250 3.2
4:1A 36 10,000 4:1 4 1.000 (4)1/2-13 2.00 × 2.750 3.2
6:1 37 12,000 6:1 6 Not applicable (4).406 1.250 × 2.250 4.8
6:1A 39 12,000 6:1 6 Not applicable (4).406 1.250 × 2.250 4.8

Model numbers that end in A are stand-alone models that are not made to close couple to existing products. These models also have input (handwheel shaft) and output shaft connections. Models that do not end in "A" are designed to close couple to DYNATORQUE 90 quarter-turn worm gear operators. These models have input (handwheel) shaft connections and use the input shaft from the primary operator for their output shaft connections. Models that do not end in "A" are offered as component parts that are assembled to primary operators.

Bolt patterns are offset to match standard spur and miter attachment patterns on faced operators.

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