PI_MACDES_D4

Three extension springs are hooked in series that support a single weight of 100 kg. The first spring is rated at 4 kN/m and the other two springs are rated 6 kN/m each. Determine the equivalent stiffness of the three springs.

Three extension springs are hooked in parallel that support a single weight of 100 kg. The springs are rated 4 kN/m, 5 kN/m, and 6 kN/m, respectively. Determine the equivalent spring constant of the three springs.

A 36-tooth pinion turning at 300 rpm drives 120-tooth gear of 14.5o involute full depth pressure angle. Determine the rpm of the driven gear.

If two parallel shafts are connected by cylinders in pure rolling contact and turning in the same direction, and having a speed ratio of 2.75, what is the Center distance of the two shafts assuming that the diameter of the smaller cylinder is 22 cm?

A triple-thread worm has a lead angle of 17o and a pitch diameter of 2.2802 inches. Find the center distance when the worm is mated with a wheel of 48 teeth.

A double-thread worm has a pitch diameter of 3 inches. The wheel has 20 teeth and a pitch diameter of 5 inches. Find the gear helix angle.

A right-handed single-thread hardened-steel worm has a catalog rating of 2.25 kW at 650 rpm when meshed with a 48-tooth cast-steel gear. The axial pitch of the worm is 25 mm, normal pressure angle is 14.5o , and the pitch diameter of the worm is 100 mm. The coefficient of friction is 0.085. Determine the shafts center distance.

A 20o straight-tooth bevel pinion having 14 teeth and a diametral pitch of 6 teeth/inch drives a 42-tooth gear. The two shafts are at right angles and in the same plane. Find the pitch angle of the pinion.

A parallel helical gear-set consists of a 19-tooth pinion driving a 57-teeth gear. The pinion has a left-hand helix angle of 20o , a normal pressure angle of 141❄2o , and a normal diametal pitch of 10 teeth/inch. If the pinion is to transmit 50 Hp at a speed of 1750 rpm. Determine the center distance of the two gears.

What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 from a load producing a unit tensile stress of 3163.27 kg/cm2 ?

A disc clutch has 6 pairs of contacting friction surfaces with an outside diameter of 200 mm and an inside diameter of 100 mm. The coefficient of friction of the clutch materials is 0.4 and the axial force is 1500 N. The shaft speed is 1200 rpm. Determine the Hp that can be transmitted by the clutch assuming uniform pressure.

Determine the power capacity of a cone clutch under uniform pressure and assuming the following conditions: major diameter = 250 mm; minor diameter = 200 mm; length of conical elements in contact = 125 mm; rotational speed = 870 rpm; coefficient of friction = 0.30; and allowable pressure = 70 kPa.

A flywheel has a mean diameter of 4 ft and is required to handle 2250 ft-lb of kinetic energy. It has a width of 8 inches, mean operating speed is 300 rpm and the coefficient of fluctuation is to be 0.05. Find the weight of rim, assuming that the arms and hub are equivalent to 10 % of the total rim weight. The flywheel is made up of cast iron with specific weight of 0.26 lb per cubic inch.

A 20o involute spur gear has a tooth whole depth of 16.95 mm, a tooth thickness of 13.2 mm, and a pitch of 3. Determine the circular pitch of the gear.

A vertical steel cylinder water tank is 30 m in diameter and 45 m high. The allowable stress of the steel plate is 1224 kg/cm2 . Without reinforcing angle bars and rods, what is the thickness of the steel plate?

What do you a wire rope in which the wires and strands are twisted in opposite directions?

A wire rope lifts a load of 10 kips at a maximum speed of 1000 feet per minute, attained in 5 seconds starting from rest. The rope has a metallic cross sectional area of 0.4 in2 . Determine the maximum tensile stress on the rope in ksi.

How do you call the circle on a gear that corresponds to the contact surface of the friction wheel?

A double-threaded right-handed worm gear transmits 15 Hp at 1150 rpm. The pitch of the worm is 0.75 inch and the pitch diameter of 3 inches. The pressure angle is 14.5o and the coefficient of friction is 0.12. Determine the tangential force on gear.

A double-threaded worm has a pitch diameter of 3 inches. The wheel has 20 teeth and a pitch diameter of 5 inches. Find the value of helix angle.

A triple-threaded worm has a lead angle of 17o and a pitch diameter of 2.25 inches. Find the center distance when the worm is mated with a wheel of 48 teeth.

How do call a wire rope in which the wires and strands are twisted in same direction?

It is the circle on gear that corresponds to the contact surface of the friction wheel. How do you call this circle?

It is the circle drawn through the top of the gear tooth; its center is at the gear center. What is this circle?

Whar is the radial distance from the pitch circle to the addendum circle of a spur gear?

This circle is drawn through the bottom of the gear tooth; its center is at the gear center. What do you call this circle?

The largest circle centered at the gear center, which is not penetrated by the teeth of the mating gear. It is a circle tangent to the addendum circle of the mating gear. What is this circle?

This radial distance of a gear is measured from the clearance circle to the root circle, and is the difference between the dedendum of one gear and addendum of the mating gear. What is this radial distance?

This radial distance in a gear is measured between the addendum and dedendum circle, snd is the sum of the addendum and the dedendum? How do you call this distance?

This minimum distance is measured between the non-driving side of a tooth and the adjacent side of the mating tooth. It is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth measured on the pitch circle. What is this distance?

What is the angle between the line drawn from the pitch point perpendicular to the line of centers and the line drawn from the pitch point to the point where a pair of teeth of gears is in contact?

This is the distance between the parallel axes of spur gears or parallel helical gears, or the distance between the crossed axes of helical gears and worm gears. It can be defined also as the distance between the centers of pitch circles. What is this distance?

This is the width of the tooth measured along the pitch circle. How do you call this tooth width of a gear?

The tooth width measured along the chord at the pitch circle is known as:

The length of teeth in an axial direction is called as:

The surface of the tooth between the pitch cylinder and the addendum cylinder is said to be:

The surface of the tooth between the pitch and root cylinders is said to be:

The surface of the top of the tooth of a gear is known as:

The surface of the bottom of the tooth space is said to be:

The distance measured along the pitch circle from a point on one tooth to the corresponding point on the adjacent tooth of the gear.

It is the number of teeth per inch of the pitch diameter. This is also a number or parameter used to determine the sizes of gears in the English system.

The ratio of the pitch diameter to the number of teeth; it is a number used to determine and specify gear sizes in the metric system.

€�The shape (profile) of the tooth of a gear must be such that the common normal at the point of contact between two teeth always passes through a fixed point on the line of centers of the gears.” The preceding statement is known as:

A curve described by a point on a circle that rolls internally or externally on another circle is said to be:

The path generated by a tracing point on a cord as the chord is unwrapped from a cylinder called the base cylinder

A triple threaded worm has a pitch diameter of 3 inches. The wheel has 25 teeth and a pitch diameter of 5 inches. Material for both the wheel and the wheel is phosphor bronze. Determine the helix angle of the gear.