CNC Machining Frequently Asked Questions

First, the workpiece cut:

the reason:

1, knife, tool strength is not too long or too small, resulting in tool knife.

2, improper operation of the operator.

3, cutting allowance is not uniform. (Such as: surface side of the stay 0.5, stay 0.15)

4, improper cutting parameters (such as: too much tolerance, SF set too fast, etc.).


1, with the principle of the knife: can not small, can not short.

2, add the clearance process, the margin as far as possible to stay even, (side and bottom balance remain the same).

3, reasonable adjustment of cutting parameters, the margin of a large corner of the repair round.

4, the use of machine tool SF function, the operator fine-tuning the speed of the machine to achieve the best results.

Second, the points in the problem:

the reason:

1, the operator is not accurate when the manual operation.

2, there are burrs around the mold.

3, in the stick of the magnetic.

4, the mold is not vertical on both sides.


1, manual operation to be repeated careful examination, as far as possible in the same point with the same height.

2, the mold around the use of Whetstone or rasp to scrap with a rag, and finally confirmed by hand.

3, the mold points before the sub-bar first demagnetization, (available ceramic sub-bar or other).

4, check the four sides of the mold is vertical, (vertical error and big fit with the fitter program).

Third, the knife problem:

the reason:

1, the operator is not accurate when the manual operation.

2, the tool clamping is wrong.

3, flying knife on the blade is wrong (Flying knife itself has a certain error).

4, R knife and flat knife and knife between the error.


1, manual operation to be carefully checked, the knife as much as possible at the same point.

2, when the knife with a wind gun blowing clean or rags clean clean.

3, flying knife on the blade to measure the pole, the light can be used when a blade.

4, a separate knife program, to avoid R knife knife knife knife between the error.

Four, crash - programming:

the reason:

1, the safety height is not enough or not set (fast feed G00 when the knife or chuck hit the workpiece).

2, the program on the tool and the actual program tool wrong.

3, the program on the length of the tool (blade length) and the depth of the actual processing error.

4, the program on the depth of the Z axis and the actual number of Z axis to take the wrong number.

5, programming coordinates set wrong.


1, accurate measurement of the height of the workpiece to ensure that the safety height above the workpiece.

2, the program on the tool and the actual program tool to be consistent (as far as possible with a single program or a single program with a single picture).

3, the actual processing of the workpiece in the depth of the measurement, written on the program clearly the length of the tool and the blade length (the general tool length longer than the workpiece 2-3MM, blade long to avoid empty 0.5-1.0MM).

4, the actual Z-axis in the workpiece number, written on the program clearly. (This operation is generally written for manual operation to be repeated check).

Five, crash - Operator:

the reason:

1, depth Z axis knife error.

2, sub-touch and run the number of errors (such as: unilateral number without infeed radius, etc.).

3, with a wrong knife (such as: D4 knife with D10 knife to processing).

4, the program goes wrong (such as: A7.NC go A9.NC).

5, manual operation when the handwheel wrong direction.

6, manual rapid feed when the wrong direction (such as: -X press + X).


1, the depth of the Z-axis knife must pay attention to the knife in what position. (Bottom, top, analysis, etc.).

2, sub-touch and run after the completion of repeated checks.

3, when the fixture to be repeated and the program and the program after the check in the installation.

4, the program should go one by one in order

5, in the manual operation, the operator himself to strengthen the machine operating proficiency.

6, in the manual fast moving, you can first increase the Z axis to the workpiece above the move.

Six, surface accuracy:

the reason:

1, cutting parameters are unreasonable, the workpiece surface rough surface.

2, the tool edge is not sharp.

3, the tool is too long clamping, blade to avoid too long.

4, chip removal, blowing, oil is not good.

5, programming pass knife way, (you can try to take along the milling).

6, the workpiece has burrs.


1, cutting parameters, tolerance, margin, speed feed settings to be reasonable.

2, the tool requires the operator to check from time to time, from time to time to replace.

3, when the fixture requires the operator to try to clip short, blade avoid not too long.

4, for flat knife, R knife, round nose knife under the cut, speed feed settings to be reasonable.

5, the workpiece has a burr: root of our machine tools, tools, knife way has a direct relationship. So we have to understand the performance of the machine, the burr side of the knife.