Application of Parameter Variables of OKUMA CNC System in Hole Machining
2025-08-02 02:17:37
We are currently engaged in the process of new product development and trial production. The R&D of new products is typically an ongoing process of continuous improvement and frequent adjustments. In many cases, changes are made locally based on previous designs—such as modifying the position or size of a hole, moving a boss, or adjusting the location of a counterbore. When it comes to machining with CNC machine tools, small holes are generally easy to process, but for larger holes, especially those with diameters of 40mm or more, and even up to 100mm, the process becomes quite challenging without the appropriate roughing and finishing boring tools. The cost of purchasing these specialized tools can be very high, and acquiring them significantly extends the time required for product development and trial runs.
To address this issue, we developed a simple subroutine tailored for the Beibei horizontal machining center (model: MAR-500/630H) we use. This subroutine proves highly effective in machining internal and stepped holes. Its implementation not only helps save tooling costs, shorten the trial production cycle, but also reduces programming errors caused by frequent design changes.
For example, consider a product called a "bracket" made from ZL101 aluminum alloy. The part involves multiple holes, and the main dimensions are simplified as shown in the figure. There are five holes in total, and no pre-cast holes were used. Our approach involved first drilling with a 27mm drill bit, then using a 36mm high-speed steel end mill to plunge into the 36mm hole. During this step, all non-tolerance holes were milled, leaving a 0.5mm tolerance. Finally, a 20mm tungsten carbide end mill was used to finish all the tolerance holes—all done without computer programming, using just three tools to complete the entire hole machining process.
The program steps are as follows:
N1500 T11 M6 (27mm drill)
N1505 G0 G90 G15 H1 X-184.6 Y102.1 (58mm hole)
N1510 S700 M3
N1515 G56 H11 Z100. M8
N1520 G71 Z50
N1525 Z5
N1530 G81 Z-25 R5 F350 M53
N1535 X-100.5 Y44.5 (42mm hole)
N1540 X0 Y0 (60mm holes)
N1545 X26 Y92 (72mm hole)
N1550 X6 Y164.1 Z-35 (45mm holes)
N1555 G80 M9
N1560 G00 Z800 M5
(... For more details, please refer to the Metalworking (Cold Processing) journal, Issue 9, 2013.)
Due to design changes, if the position, size, or depth of a hole is modified, it’s only necessary to update the corresponding coordinate values in the program. This makes the programming process simple, fast, and less error-prone. Additionally, this method can be applied to other CNC systems as well. These are some of our practical experiences during the production and processing stages. We hope that fellow professionals can share their insights, explore further, and work together to improve our techniques.
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Electric winches are available in various sizes and load capacities to suit different needs. In the automotive world, they are a popular choice for off-road vehicles like ATVs, UTVs, and trucks. For example, when an off-road vehicle gets stuck in mud, sand, or snow, an electric winch with an appropriate pulling capacity can be used to tow it to safety. These winches can have capacities ranging from a few thousand pounds to over ten thousand pounds, depending on the vehicle size and the expected operating conditions.
In industrial settings, electric winches are essential for material handling. They can be used to lift and move heavy machinery, construction materials, and other large items in factories, warehouses, and construction sites. Their ability to provide precise control over the movement of loads makes them ideal for delicate operations where accuracy is key.
The power source for electric winches can vary. In automotive applications, they are typically powered by the vehicle's 12-volt battery. In industrial and commercial settings, they can be connected to standard AC power sources, with options for single-phase or three-phase power depending on the required power output. Some electric winches also come with features like automatic load-holding brakes, which prevent the load from slipping when the winch is not in operation, and overload protection to safeguard the winch and the load from damage in case of excessive stress. Additionally, many are designed with a waterproof and durable construction, ensuring reliable performance even in harsh outdoor or marine environments.
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