Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much bett...
The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200 beryllium copper and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form o...
The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200 beryllium copper and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form o...
Calliper has a variety of measuring modes, easy to operate, durable, versatile and low cost, can be said to be the most common measuring tool in the tool box. However, there are a lot of matters needing attention to the correct use of calipers. Let's start with the error factors that affect the measurement results.
Error component
When measuring with calipers, there are many factors that cause errors, such as parallax, error caused by structure not in accordance with Abbe principle, thermal expansion caused by temperature difference between calipers and workpieces, and so on. In addition, because the caliper has no constant pressure device, it is difficult to grasp the appropriate and uniform force measurement when measuring, which is another factor causing errors.
The structure of calipers does not conform to Abbe's principle
The structure of calipers doesn't conform to Abbe's principle
The reading number axis and measuring axis of calipers do not conform to Abbe principle because of different axes, so when using calipers, the root or tip of the claw is used to measure, there will be a risk of increasing the measurement error. When measuring, it should be noted that the measured workpiece should be as close to the ruler body as possible (reading number axis).
Read the parallax of the scale
Look directly at the cursor scale when checking that it is aligned with the main scale divider.
The difference height between the vernier and the main ruler scale surface is easy to cause reading error. As shown in the figure below, if the cursor scale is viewed from an oblique direction, the error shown in the figure ΔX will result. To avoid this effect, the JIS specification states that the step height (H) should not be greater than 0.3mm.
Bending of datum end face
The bending of the ruler that guides the ruler to slide will result in an error as shown in the figure below, which can be expressed by the same calculation formula as the error that does not conform to Abbe's principle.
Assume that the deformation caused by bending of the guide ruler is 0.01mm/50mm, and the tip of the outside diameter is 40mm to calculate:f＝40mm×0.01÷50＝0.008mm
The relationship between measurement and temperature
The body of the caliper is generally made of stainless steel, which has the same thermal expansion coefficient (10.2±1)×10-6/K as the iron metal. The influence of the material of the measured object, room temperature and the temperature of the workpiece on the measurement should be considered when measuring.
Precautions in operation
The calipers are very sharp, so the instrument must be handled with care to avoid personal injury.
Avoid damaging the scale of the digital caliper. Do not encode the identification number or leave other information with the electric pen.
Avoid damaging the scale of the digital caliper. Do not encode the identification number or leave other information with the electric pen.
Maintenance of sliding surfaces and measuring surfaces
Before using calipers, wipe away dust and dirt on sliding and measuring surfaces with a soft, dry cloth.
Check and calibrate the origin before use
Clip a clean piece of paper between your outer PAWS and slowly pull it out. Close the caliper and make sure the vernier scale (or display) is set to zero before using the caliper. When using digital calipers, reset the battery after replacing it (zero button).
Operation after use
After using the caliper, wipe off the water and oil thoroughly. Then, lightly smear with anti-rust oil and let dry before storing. Waterproof calipers, in order to prevent the occurrence of rust after use, also need to wipe the water calipers.
Storage Precautions
Avoid direct sunlight, high temperature, low temperature and store in high humidity. If digital calipers are not used for more than three months, remove the battery before storage. Do not allow the outside measuring claw of the caliper to be completely closed during storage.
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