Posted on Dec 30th, 2019 | By Hazel, WayKen Project Manager
In modern society, every robot comes out from the CAD drawings of Robot designers which tell how it looks and works but can’t come into truth without the help of the machining technologies.
With CAD drawings, robot designers are able to take the advantages of computer numerical control equipment, commonly known as CNC machining, to obtain necessary metal and plastic parts, which can be called as custom machining. If you need reliable custom parts or project services, you can contact us there and we can get back at you.
As we all know, robots now are widely used in many industries, accordingly, to be sorted in different categories, such as aerospace, consumer, disaster response, drones, education, entertainment, exoskeletons, humanoids, industrial, medical, military & security, research, self-driving cars, telepresence and underwater, etc… Each robot has its own unique features, and as a whole, robots vary hugely in size, shape, and capabilities. That’s why the custom machining plays an important role for developing robots from robot prototyping to robot machining.
5 Benefits of Custom Machining for Robotic Parts
1. Direct and Easy Customization
As long as CNC engineers get the CAD drawings of robotic parts in suitable format like step or igs format, they can write the program language based on files into the CNC machines, and then the machines will remove material of workpiece in programed paths to make it same as what in the CAD drawing (Subtractive Manufacturing Technology). Along the machining process, robot designers do not need to get involved and can just put it aside and wait for receiving the real parts they expect.
2. Highly Accurate Machining
Accurate machining is the key to robotic parts that ensure its target functions to be well performed. Correspondingly, CNC machines are used to fabricate workpiece that have high precision requirement. Generally, it is possible to get an accuracy of up to 0.005 inches / 0.15 mm. For example, WayKen, a prototype machining shop in China, apply DIN-ISO-2768 (medium) for machined plastic and DIN-ISO-2768 (fine) for machined metals, typically holding a machining tolerance from +/-0.005" (+/-0.125mm) to +/-0.002" (+/-0.05mm) for linear tolerance. The exact accuracy depends on the robot part that is being worked. It can be found that when multiple pieces are being continually worked, the machined parts will be much more accurate.
3. Multi Applicable Materials
CNC machines are able to work plastics, metal and a number of other materials, which satisfy the requirements on properties and appearance of varied robotic parts. Aluminum and steel are most often used for the arms and bases of the robots to ensure its strength and functionality. Plastics usually are used in the housings or covers of the robots for aesthetic use, and also lower weights. In some case, for experimental uses, the custom machining makes it possible to make same robotic parts in multiple pieces of different materials.
4. Time Saving
One of the primary benefits of custom machining is that it can save the time and money on finding the suitable parts on the markets. Although there are indeed some specified parts with lower prices in mass production, it is not easy to find exact one the design needs. How much time could it take to locate used parts that may or may not be efficient, or search for parts on sales that are languishing on the shelf of some unknown parts service shops? In some cases, the loss of time can significantly throw off the production schedule. The right custom machine shop can take the parts’ specifications, create the parts as expected, and offer them in a fraction of the time.
The amount the robot designer will spend on custom machining if often much less than they will pay for 3D printing (Additive layer manufacturing). Although 3D printing does have its place in many industries, currently, due to technical limitation, it has limited the achievable machining accuracy and applicable materials, especially for metal parts. Usually, the costs of 3D printing depend on the parts’ weight. However, robotic parts use metals quite a lot, if by 3D printing, the large weights will charge unexpectedly high costs. It is more affordable to have custom parts through custom machining, as well as with better quality.
Possible Differences among Machining Shops for Custom Robotic Parts
Usually, when ask for a quote, the robot designers will tell machining shops specifications of custom robotic arms in material, dimensions, finishing and assembly. By an overall evaluation, the machining shops will offer their machining solutions which may differ from one to another – machining solutions, including feasible machining changes if needed. Besides the profits difference, what will the differences among machining shops?
- Machining processes
3-axis milling, 5-axis milling, turning, grinding, etc… Although machining process depends on the part structure, one part can be produced in kinds of ways which is defer in accuracy, costs, and machining time. If the machining shop doesn’t have well understanding on the custom robot, it is possible to offer a high quote with unnecessary machining process or offer a lower quote that takes long lead time.
- Finishing processes
Machined finish only, sand-polishing, mirror polishing, anodization, painting, sandblasting, coating, etc… Except standard colors, the designer will not have specified finishing degree usually. If without second checking, take sand-polishing, if only “polish” is required, some machining shops possibly quote by 180# grits sand-polishing, some quote by 800#, some even quote by 2000# grits…, resulting different offers.
- Exclusive machining
Common custom robotic parts made at machining include gears, bushings, chassis, brackets, arms and motor mount… Each may have different focusing features. For example, robotic gears are mechanical parts with cut teeth designed to mesh with teeth on another part so as to transmit or receive force and motion. Although the common CNC machining is able to make qualified gears, to ensure high teeth tolerance, it needs fine machining on milling machine, resulting high costs and more time. There is an exclusive machining process called teeth shaping, which is special on gear machining to satisfy different gear specification easily.
Robots have been developing in a high-speed road, gradually spreading in every corner of life. However, without custom machining, robot designers can only be limited in the first step. Supported by suitable machining technologies, robot industries will go far away in the futures. Let machining shops give you a hand!
For more information about Robot machining robots and custom machining solutions, you can request a quote there.