Join the Facebook Group: https://www.facebook.com/groups/996447607429641/
In this article you're going to learn how to mirror polish crank arms. I'll be hand sanding the crank arms using flint paper with various grits before moving into machine polishing to give it that mirror finish.
Polishing any type of metal takes a lot of time if you want to do it right. Especially if the metal has signs of damage like nicks and dents besides surface scratches. The crankset I've polished had these. All in all it took me around 3 hours to achieve the result I was looking for.
Tools used
Polishing machine: https://www.hbm-machines.com/producten/acties/hbm-150-mm-hobby-polijstmachine
Sand paper: https://www.hbm-machines.com/producten/acties/hbm-waterproof-schuurpapier-pak-10-stuks
This whole procedure takes about 3 hours
I've also written about blog post with more information. If you want to read this article go to https://www.restoration.bike/bike-restoration/polish-crank-arms/
Visit my website for more bike restoration tutorials: https://www.restoration.bike/
Music is from the YouTube Audio Library
Song is "Song of Sadhana" from Jesse Gallagher