September 11, 2020

Down to the Basics: Parting.

Over the next couple weeks, we’re going to go over the six, basic machine processes that go into making our parts; Turning, Hobbing, Milling, Tapping, Boring, Parting, and Broaching.

Although there are numerous post-production steps that go into finishing a Profile Racing part, this is where it starts.

Up Fourth: Parting.

Parting is only done on a lathe, predominately with lengths of bar stock. Some of our products are made with pre-cut lengths of material which do not involve parting.

The boring bar retracting after finishing the bore job on our 19mm drive side Mid Bottom Bracket cones.

At this point, the profiling tool will come in and shape the cone.

Once shaping is done, the profiling tool will come in behind the part and, quite literally, cut it off. This is Parting.

The finished drive-side cone, to be sent to anodizing.


September 11, 2020


We are taking precautions to protect our employees and follow CDC and state guidelines. In the meantime, our machine shop is still running, we're here to assist you and we'll be shipping product to help support bike shops during this difficult time.