Re: FD Roller, Material?, Method?
The hole saws cut a pretty true roller as cut. If the pilot hole left by the saw is drilled @ 90 degrees it a decent running roller. I have since the move sold my lathe, but I used to true them on it. Surprisingly it required very little material removed to do it. I understand the reasoning behind the belt driven roller, I have built several. But the simplest, best operating, most user friendly FD I have is the direct drive Lifan/Mongoose full suspension MTB. Ratio changes are less than a minute, and it has enough bite to kill the engine with the brakes at lower speeds. I do have some spring down tension to assist with the engine weight. Mine is mounted entirely in the rear suspension so there is no interaction.