Guide to Manufacturing Bike Chainrings Through CNC Machining
CNC is emerging to be a cornerstone of manufacturing CNC bike parts. One such critical bike component is the chainring. The following guide will provide insight into how we at Creatingway achieve this. It will give primary focus to CNC turning as well as CNC milling. We mainly depend on these two modes of machining in the machining of CNC bike components.
Most CNC shops are set up such that there is a line of paired CNC machines. The pairing makes operating of the machines much more efficient. One operator can undertake this task with ease. The operator first places the workpiece in the machine. He then commences the sequence. This normally takes up a few minutes to accomplish. During the execution of the program, the operator turns on the other machine. He then removes the completed piece and replaces it with a fresh one. The sequence for the second workpiece begins. A day’s machining entails this continuous back and forth.
How CNC Milling and CNC Turning Work?
CNC milling involves milling with an array of tool bits. The workpiece is normally in one position as we shape it. A rapidly rotating milling cutter or cylindrical tool bit moves around the workpiece. We guide the movement through a CNC program. Milling cutters can move along several axes. This allows the designer to develop all manner of shapes, holes, and slots for CNC bike parts.
In CNC turning, the machined workpiece rotates rapidly. The cutting tool bits are normally stationary. They, however, must meet the workpiece to facilitate the cutting action. One machine can carry out several operations on the piece. This is since we can slot different tools into a platform. The platform then rotates around the next tool upon completion of one cutting process.
Both CNC turning and milling are extremely accurate. Their tolerances can reach up to a thousandth of a millimeter. We are thus able to quickly produce a lot of bike components.
Manufacturing Bike Chainrings Through CNC Milling
CNC milling is vital when it comes to manufacturing bike chainrings. The only limit to what we can create is the practical use of its output. The tool bits are normally high strength steel. However, they can also have carbide tips for extra hardness and durability.
In CNC chainring milling, we start with aluminum blocks or blanks. Each blank has a bigger diameter than the final machined one. We measure it from the apex of one chainring tooth to the tooth that is diametrically opposite. These blanks serve as the raw material for a variety of chainrings sizes and shapes.
The common types of aluminum alloys we use in CNC bike part manufacturing are AL6061 and AL7005/75. Their common name is aerospace aluminum. AL6060 is slightly heavier and cheaper than AL7005. We sometimes chose AL7046 over AL7005. This is since it is 80% stronger and 16% lighter. It, however, costs twice as much.
Manufacturing Bike Chainrings Through CNC Turning
In CNC turning, we fix the blank onto a platform or a drum holding several drill bits. The workpiece then rotates as the cutting tools remove material according to the instructions. The first tool normally cuts the center. Upon completion of cutting, the drum or platform rotates to the next tool bit. This tool bit eliminates the alloy from the outer edge to the inside. This results in a clean batch of machined pieces.
CNC Milling Narrow-Wide Chainrings
We are going to have a look at how we produce top-notch bike CNC chainrings. The operator first slides the door and fixes the blank into position. Closing of the door prevents the flinging of swarf around the workshop. Most CNC milling procedures require large quantities of coolant. We apply it at the point of contact between the tool bit and the workpiece surface. The operating feature is normally on the right side. Its most prominent feature is the start/stop button. This is since the machinery utilizes high-speed processing.
The operator hits the start button to commence the sequence. The CNC program directs the cutter head position through XYZ coordinates. The X and Y determine the horizontal position on the X and Y axes. The Z determines the vertical position.
How To Produce Manufacturing Bike Chainrings
In narrow-wide CNC machining of chainrings, the chainrings initially have the same shape and size. The CNC mill has to cut a narrow-wide profile into the bike chainring teeth. The base plate comprises of four mounts. Our operator places one chainring on each. He then positions the holding plate over the top and secures it using bolts. The CNC milling tool bit rotates in a clockwise direction as it mills each tooth to specification
Upon hitting the start button again, the platform moves into the cabinet’s center. The module descends and the cutting sequence begins from right to left. We mill each chainring in turn. The tool bit cuts through the inside of two teeth. It removes most of the material from the middle tooth. This results in the middle tooth being the narrow one in an alternating pattern of wide-narrow-wide-narrow.
The milling is now complete, and the operator unbolts the plates. This allows for the removal of the chainrings. Hence, we can then replace them with a new batch.
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