Does the cutting force increase with the following why a increasing depth of cut B decreasing rake angle?

It is logical that the cutting force increases as the depth of cut increases and rake angle decreases. Deeper cuts remove more material, thus requiring a higher cutting force.

What is rake angle in machining?

Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work. There are three types of rake angles: positive, zero or neutral, and negative.

What is the total velocity of metal cutting?

The phrase speeds and feeds or feeds and speeds refers to two separate velocities in machine tool practice, cutting speed and feed rate. They are often considered as a pair because of their combined effect on the cutting process.

How do you calculate cutting velocity?

Check the item you want to calculate, input values in the two boxes, and then press the Calculate button. What is the cutting speed when main axis spindle speed is 700min-1and external diameter is Φ50 ? Substitute π=3.14, Dm=50, n=700 into the formula. Cutting speed is 110m/min.

What is the formula of calculate the turning time?

rpm = 12 × sfm ÷ (π × cutting diameter in inches), rpm = 1,000 × m/min.

How do you calculate RPM on a 3 phase motor?

Calculating RPM for a three phase induction motor is relatively simple… ACThree Phase Induction MotorRPMis determined by the formula: RPM = (120 * Frequency) / # of poles in the motor.

How do you calculate the starting current of a 3 phase motor?

When the actual load current is equal to the full load current rating of the motor then the starting current can be estimated as FLA x 7.5.

What is 120 in motor speed formula?

One cycle of AC current through the windings make the pole axes to move along one pair of poles ( P/2 ). Rearrangement of the above equation will give the equation for synchronous speed in rpm as: Ns = [ ( 120 × fs ) / P ] rpm. Hence 120 is the product of 60 and 2.

How many RPM is a 6 pole motor?

1,200 rpm

Which is better 2 pole or 4-pole motor?

A 4-pole motor has about 3.0 ft-lbs of torque per horsepower whereas a 2 pole motor has 1.5 ft-lbs of torque. At 60Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm. Thus, the 4-pole motor provides higher-efficiency, higher torque per unit of volume and weight.

What RPM does a 2 pole rotor produce 60Hz?

approximately 3600 rpm

How much can you overspeed a motor with a VFD?

If your load really requires it, depending on the manufacturer, motors rated for use with vector VFD drives can often accommodate 1000:1 or 2000:1 turndown ratios. If you need super-high turndown ratios with high levels of low-speed torque, this will mean using a VFD with vector control.

Can a VFD damage a motor?

Shaft currents induced by VFDs can lead to motor failures. Without some form of mitigation, shaft currents travel to ground through bearings, causing pitting, fusion craters, fluting, excessive bearing noise, eventual bearing failure, and subsequent motor failure. This is not a small problem.

Can I run a 50Hz motor at 100 Hz?

Now, since the motor is rated for 380V 100Hz. For driving it at 50Hz you need to halve the voltage as well i.e, V=190 volts. You can also keep Voltage below 190V at 50Hz to reduce operating torque but not beyond 190 otherwise the core will undergo saturation.

What should the maximum frequency setting be for a 2 pole motor with a 60 Hz rating?

75Hz

Can VFD increase torque?

A VFD cannot increase the voltage above its supply voltage. This causes the current to decrease as frequency increases, thus decreasing the available torque. Theoretically, torque is reduced by the ratio of the base speed divided by the higher speed (60 hertz / 90 hertz = 67%).

How is a VFD controlled?

A variable frequency drive controls the speed of an AC motor by varying the frequency supplied to the motor. This section of the VFD is often referred to as the DC link. This DC voltage is then converted back into AC.

How do you calculate VFD rpm?

The equation to calculate this is: The actual frequency divided by the potential frequency = X divided by the RPM on the machine nameplate….To reiterate, to calculate the RPM of a VFD, you need:

The number on the VFD’s control panel.
The standard cycle frequency.
The RPM on the motor nameplate.

How is VFD calculated?

EXAMPLE

Step 1: 60 hp × 0.746 = 44.76 kw1
Step 2: 0.28 ratio × 44.76 kw1 = 12.53 kw2
Step 3: 0.88 ratio × 44.76 kw1 = 39.39 kw3
Step 4: 39.39 kw3 – 12.53 kw2 = 26.86 kw4
Step 5: 26.86 kw4 × 8,760 hr × $0.12 per kwh = $28,235 (annual savings)

Does a VFD convert AC to DC?

A Variable Frequency Drive(VFD) can take a single phase at 120V/240VAC, convert it directly to DC, and then share that DC to create completely new 3-phase AC at any frequency. This allows the motor speed to be varied.

How do you select a VFD for a motor?

Read below to learn more about the six factors you should be considering when choosing a VFD.

Full Load Amperage. The first step in this process is making sure the drive can handle the motors current demands.
Overload.
Application Type.
Altitude.
Temperature.
Carrier Frequency.

Can I put a VFD on any motor?

Output voltages are available for VFDs to match almost any existing motor voltage. However, very few, if any, VFDs have a direct 13,800-volt output for very high-voltage motors. For these cases, using a step-up transformer on the output of the VFD is often necessary to match the motor voltage.

Why we use VFD for motor?

So, energy savings, intelligent motor control and reduction of peak-current drawn are three great reasons to choose a VFD as the controller in every motor-driven system. The most common uses of a VFD are for control of fans, pumps and compressors, and these applications account for 75% of all drives operating globally.

How much is a VFD?

Typical installed costs of VFD systems range from $200 to $500 per horsepower (HP). Suppliers can assist users in selecting a VFD that is properly sized and that includes any necessary filters and reactors.