I was recently out at Cycle Underground with John and he ran me through the process of having the Candy Cranks chainrings manufactured.
Firstly my design is drawn up in Autocad.
The design is then programmed in Mastercam. This program tells the CNC machine what needs to be cut and which cutter to use.
The CNC God.
Raw piece of aluminum, waiting to go into the CNC machine.
The plate is clamped down on the jig ready for the first cut.
The first chamfer is cut on the back. Coolant is constantly sprayed onto the aluminium to keep everything cool.
Outside chamfer complete, 5 bolt holes are cut.
It’s now bolted onto the jig through the bolt holes so the middle section can be cut out.
Next the teeth are cut.
Continued… hit the READ MORE button below.
Teeth complete and middle section removed.
Off to the recyclers.
Next the patterned holes are cut.
The cutters, the rougher (on top), cuts the initial pattern out, then the finisher (below) smoothes out the edges.
The stars are finished.
Close up of the cutouts.
The Candy Cranks logo, BCD and tooth size is cut.
Voila! One raw chainring.
This is where the boyfriend comes in handy… it nows needs to be sanded, first with 240 wet and dry paper, then with 360 wet and dry paper for a finer finish.
Back from the anodizers, the stars are painted to the desired colour.
On the bike and ready to go!