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  • Blog
  • Free Calculator
    • Steel Weight Calculator
    • Metal Weight Calculator
    • Sheet Metal Bending Calculator
    • K Factor Calculator
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  • Guillotine Shear: Common Faults and Troubleshooting

Press Brake FAQs

  • How to adjust the size of the press brake?
  • How to adjust the angle of the press brake?
  • How to compensate deflection of press brake machine?
  • The press brake can’t go up and down. What’s the matter?
  • How to bend an arc with a press brake?
  • Comparison between grating ruler and magnetic grating ruler of press brake
  • Up and down moving type of press brake, which is better?
  • What is the problem that the downward speed of the hydraulic press brake suddenly slows down during operation?
  • The bending angle of the press brake is different
  • How long to change the hydraulic oil of the press brake?
  • List of hazard sources and risk assessment form of press brake
  • List of minimum bending radius of common metal materials
  • How many press brake controllers are there? How to choose?
  • How to choose between open loop and closed loop press brake?
  • What is a three cylinder press brake?
  • What is a four cylinder press brake?
  • What is the difference between three cylinder press brake and two cylinder press brake?
  • Why can’t the press brake machine return?
  • What are the functions of three motors of ordinary press brake machine?
  • What are the functions of the three relief valves on the press brake?
  • What if the press brake doesn’t go up when it comes down?
  • The press brake is normal up and down, but it is not pressurized!
  • Where does the number of backgauge axis (X,Y,Z,R) of press brake refer to?
  • How does the X-axis of press brake return to the origin?
  • Why the Y-axis of press brake does not return?
  • How many times to bend a large arc and how to calculate the bending angle?
  • How to adjust the stroke of the press brake?
  • The pressure at both ends of the hydraulic press brake is not the same. How to adjust it?
  • The cylinder stroke on both sides of the press brake is different. How to adjust it?
  • How to program CNC press brake?
  • How to adjust the downward speed of the press brake?
  • How to calculate the size and angle of sheet metal bending?
  • How to calculate the nominal pressure required by the press brake according to the thickness and length of the steel plate to be bent?
  • How to calculate the unfolded dimension of sheet metal bending?
  • How is the bending coefficient of sheet metal calculated
  • What is the relationship between bending factor and plate thickness, bending angle and bending radius?
  • How to calculate the bending coefficient of sheet stainless steel?
  • How to calculate the tolerance of sheet bending machine?
  • What is the reason why the middle of the folded workpiece is bent?
  • Why can’t the hydraulic press brake go up and down?
  • How can the angle of the press brake be adjusted if it cannot be pressed at right angles
  • How to fold different angles with a press brake?
  • How to disassemble the oil cylinder of the press brake?
  • The press brake cannot be started
  • How to eliminate the bending indentation of stainless steel press brake die
  • How to adjust the downward speed of the press brake machine?
  • What’s wrong with the unstable pressure of the press brake?
  • Why can’t the press brake machine rise?
  • What about the deformation of the press brake ram?
  • How does press brake bend a cone?
  • How to use press brake to fold a large circular arc?
  • What’s the matter with the slow down speed of the press brake?
  • What if the downward speed of the press brake is fast?
  • The downward speed of the hydraulic press brake becomes slow and the upward jitter!
  • What happened to the hydraulic oil leakage on one side of the press brake?
  • The two cylinders of the press brake are not synchronized
  • What if the workpiece interferes with the press brake machine?
  • Can the press brake machine fold the U-groove?
  • Environmental requirements of CNC press brake
  • What happened to the abnormal noise of the press brake oil pump motor?
  • A simple method for electric heating of hydraulic oil of press brake
  • What’s wrong that the press brake punch can’t lower to the bottom?
  • How to select the size of the lower V groove for sheet metal bending according to the plate thickness
  • How to break the lock of the press brake?
  • How to determine the bending radius of sheet metal?
  • How to solve the problem that the press brake pressurizes too slowly? How to pressurize quickly
  • What hydraulic oil does the press brake use?
  • How many years to change the press brake hydraulic oil?
  • What determines the sheet metal bend radius?
  • Stress relief of stainless steel 304 after bending
  • What are the corresponding protective devices of the press brake?
  • How to adjust CNC press brake?
  • What is the reason for the noise of press brake?
  • How to solve the oil leakage of oil cylinder of the press brake?
  • How to repair the scratches on mirror stainless steel?
  • How much can the bending tolerance of the press brake be controlled?
  • What is the minimum bending size of the press brake?
  • Where is the pressure relief after pressurization of the press brake adjusted?
  • How to choose electro-hydraulic servo synchronous cnc press brake?
  • How to fold a semicircle with a pres brake?
  • How is the inner radius of sheet metal bending determined?
  • How to calculate the bending radius of sheet metal?
  • How to set bending radius and bending deduction in SolidWorks?
  • The most complete sheet metal bending allowance table
  • How to set the K factor, bending deduction, bending allowance and bending calculation in SolidWorks? What’s their relationship?
  • How does the press brake accurately control the bending angle?
  • What is the reason why the blade of press brake can’t rise?
  • Which axes do the 3 + 1 axis and 4 + 1 axis of the press brake refer to respectively?
  • What does the Y value limit of press brake mean?
  • Function of time relay in press brake circuit
  • What is the difference between electro-hydraulic servo press brake and torque synchronous press brake?
  • What hydraulic pump is generally used for press brake?
  • How do you know what material the lower die of the press brake is?
  • When the press brake steps up, it cannot stop and automatically slides down
  • How to understand the N + 1 axis of press brake machine?
  • How to change the tool of press brake?
  • What material is generally used for press brake dies? What is the hardness?
  • Do you need to grind the top punch of press brake?
  • How to level the tools of press brake?
  • What is the problem that the press brake tools are not in a straight line?
  • How to repair the crack of stainless steel bending tool?
  • How to select the material of press brake die?
  • What is the problem of automatic tool drop of ordinary press brake?
  • How does the press brake go down slowly?
  • What is the difference between the acute punch and gooseneck punch of press brake?
  • The press brake tool has dents. How to repair it?
  • What is the quenching hardness of general press brake die?
  • Calculation formula of press brake die price
  • What is the general angle of the press brake dies?
  • How to select arc radius punch and die of press brake?
  • How to calculate the bending angle of the press brake?
  • What are the factors that determine the service life of press brake die?
  • How to select the top punch of the press brake?
  • Golden section size of press brake dies
  • Anti rust treatment of press brake dies
  • Comparison chart of press brake die combination
  • The press down pressure of the press brake machine is not enough, but the rising pressure is normal

Press Brake Hub

  • What is CNC press brake and it’s working principle
  • Brief introduction of synchronous system of CNC press brake
  • Workpiece bending diagram of press brake
  • Installation of CNC press brake
  • Operation of CNC press brake
  • Adjustment of bending parameters of CNC press brake
  • Bending accuracy of CNC press brake
  • Safety protection of CNC press brake
  • Press brake punch and die installation
  • Adjustment of CNC press brake
  • Hydraulic oil of CNC press brake
  • Lubrication of CNC press brake
  • Repair and maintenance of CNC press brake
  • Main structure of CNC press brake
  • Explanation of CNC press brake axis
  • Operating environment of press brake
  • Press brake punch and die selection
  • Adjustment of press brake’s mechanical part
  • Causes and solutions of common faults of press brake

Guillotine Shear Hub

  • Purpose and characteristics of the guillotine shear
  • Main structure of the guillotine shear
  • Hydraulic system of the guillotine shear
  • Lifting and installation of the guillotine shear
  • Lubrication of the guillotine shear
  • Operation and adjustment of the guillotine shear
  • Safety and maintenance of the guillotine shear
  • Guillotine Shear: Common Faults and Troubleshooting
  • Accuracy check of the guillotine shear
  • Home
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  • Hydraulic Shear
  • Guillotine Shear Hub
  • Guillotine Shear: Common Faults and Troubleshooting

Guillotine Shear: Common Faults and Troubleshooting

Table of Contents
  • The main motor cannot be started
  • NCRDY is not displayed
  • The X-axis does not work properly
  • The size of X-axis is 5mm and 10mm larger or smaller than the normal state
  • The blanking size is different from the actual programmed size
  • The machine cannot go down
  • No main pressure
  • The slider does not drop after the foot switch is depressed

The main motor cannot be started #

Causes

  • Emergency stop switch off
  • 1QF1 switch off
  • Lack of phase
  • Hydraulic oil cannot be extracted

Solutions

  • Turn on the emergency stop switch
  • Close 1QF1 switch
  • Check the circuit
  • Check whether the filter is blocked

NCRDY is not displayed #

Causes

  • The start switch of CNC system is not started
  • X-axis, shear angle and clearance are not in place

Solutions

  • Press the NC system start switch
  • Press the hand wheel control key once, move the cursor to relevant positions respectively, check which of X, a and G is not in place, and analyze the cause.

The X-axis does not work properly #

Causes

  • Servo drive alarm
  • 1QF3 not closed
  • The power line or encoder line or servo motor fails

Solutions

  • Check the cause of the alarm (see remarks)
  • Close 1QF3
  • Check the wiring

The size of X-axis is 5mm and 10mm larger or smaller than the normal state #

Causes

The position finding is not accurate when returning to the reference point.

Solutions

  • Shut down and restart
  • Move the reference point sensor 1-2mm or adjust the sensing distance of the sensor

The blanking size is different from the actual programmed size #

Causes

  • Caused by artificial feeding
  • Rear stop movement of machine tool

Solutions

  • Refeeding and shearing
  • Corrected X reference point

The machine cannot go down #

Causes

  • Down valve stuck
  • No signal to downstream valve
  • No main pressure

Solutions

  • Check down valve
  • Check the control circuit
  • Check the main pressure valve

No main pressure #

Causes

  • Main motor not started
  • The main pressure valve is damaged or inoperative
  • PLC control circuit failure

Solutions

  • Start the main motor
  • Replace or clean the main pressure valve and check the control valve coil circuit
  • Check PLC controller

The slider does not drop after the foot switch is depressed #

Causes

  • The controller has no “ncrdy” signal
  • Loose line
  • PLC no signal output

Solutions

  • Check that there is no “ncrdy” reason
  • Check and connect relevant circuits according to the electrical schematic diagram
  • Check PLC controller

Related:

  • Operation and adjustment of the guillotine shear
  • Hydraulic system of the guillotine shear
  • Safety and maintenance of the guillotine shear
  • Lifting and installation of the guillotine shear
  • Accuracy check of the guillotine shear
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Updated on August 31, 2022
Safety and maintenance of the guillotine shearAccuracy check of the guillotine shear

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Table of Contents
  • The main motor cannot be started
  • NCRDY is not displayed
  • The X-axis does not work properly
  • The size of X-axis is 5mm and 10mm larger or smaller than the normal state
  • The blanking size is different from the actual programmed size
  • The machine cannot go down
  • No main pressure
  • The slider does not drop after the foot switch is depressed
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