The CNC machining machinists are quite fond of seeing such equipments as + / – 0.005 “, which are the six techniques to maintain strict yamen service requirements in CNC precision parts processing. Five thousandths of an inch is a workout for any good mechanic – they might as well close their eyes and grind. But those jobs are more demanding. Add another zero, now you have: 0.0005 “. Holding five tenths of you is a completely different story. This is the difference between the thickness of a person’s hair and white blood cells. When it comes to strict yamen runner, here are some suggestions to maintain your part specifications.
1. The spindle warms up to maintain the critical tolerance
Run a warm-up program – although it’s a standard program for a lot of CNC machines, it’s more difficult to study and run. A typical program only warms up the spindle, which is essential for applying grease to prevent premature bearing wear. However, you also need to allow internal components to reach a safe operating temperature to cope with thermal expansion. Now, if you only want to maintain strict yamen service on the z-axis, all of these are accurate, but if you integrate the preheating of the spindle with the movement of the machine tool on all the axes, this will help further. The machine is allowed to run for 10-20 minutes, and all parts move to the desired temperature, which will help reduce the impact of thermal expansion of milling time. No matter what, at the end of the warm-up, make sure to measure all the equipment accurately and maintain strict yamen service.
Tool selection may be a factor in maintaining strict government service. Rough machining is carried out with rough machining equipment, so as to reduce the wear of finish machining tools and maintain the accuracy.
2. Equipment selection for maintaining tight yamen service
Choose your equipment carefully – when you deal with these intolerant yamen runners, make sure it is suitable for you. You need to ensure that you have specific equipment for roughing and finishing, so that the roughing tool can receive wear, while the finishing tool only saves one process, so as to ensure the repeatable process of creating accurate parts.
3. Strictly tolerated compensation
Compensation for your equipment – the equipment manufacturers are not happy, so they design the equipment with a little tolerance. They know that if you want to use their equipment to do something, you will be more happy if its reduction performance goes out of too large size instead of too large size. It’s like shaving: you might as well take a rest, but you can’t put it back. Knowing this, you need to make sure that the first thing you do when configuring an accurate job is to dial your essential equipment diameter. You can finish it in many ways, but my preferred way is to mill a feature, and then use accurate equipment to verify the size. Very simple – if you insert a 0.250 inch hole with a 0.236 inch tool, and only a 0.248 inch measuring pin can be inserted, then your tool size will be reduced by 0.001 inch (because the size of each side cannot be small, so use half value).
4. Maintain the temperature of tight yamen service
Thermal stability – this is one of the important things in the list, because it can make a huge difference, and you may not even pay attention to it. Please pay attention to the location of your machinery. Is it close to the window? If so, at some time of the day, is the sunlight reflected on it? Is the air conditioning system started in the afternoon and blowing cool air in the cabin? Are your raw materials stored in a stuffy warehouse, and then enter the cold 68 ° environment? These seem innocent, but will cause huge difficulties in your process. The thermal expansion or contraction of a milling machine or cutting material can vary greatly in your processing. Put all of this in place – keep your machinery and materials in a temperature controlled climate, protected from the sun, and you’ll be rewarded – in the totality of your process.
5. Maintain the calibration of government officials
Calibrate your device – when you’ve done all of the above, all you need is * that * is more stringent, research calls at the manufacturer. After a machine is built, transportation, falling off the truck, moving, stabilizing, using thousands of hours, things will be transferred and handled. This is not preventable. Fortunately, there are several pieces of equipment, whether granite block or Renishaw ballbar, that can help maintain the reins on the loose machinery of the marathon. We like to have a club test and adjust it as part of our annual care so that you can maintain a close relationship with the accuracy of the machine. In the rest, the implementation of these annual services can ensure that the bearings are tight and smooth, the belts are properly tensioned, and the drive motors operate well – these are important factors for accurate machining machinery.
6. Linear scale for maintaining tight government service
If it all fails, scale! – if you still finish all the work on this list, and still try your best, it’s probably time to study using linear scale to obtain machinery. Your typical CNC machine will use the drive motor encoder as the key way to track its absolute position, but this may be due to the shortcomings of the ball screw or the formation of temperature difference. The linear scale changes all of this – usually installed in the workshop, they are composed of two key parts – the scale and the reading head.
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