- Joined
- Sep 7, 2019
- Messages
- 674
Next up is the pivot link for the lower end of the crank arm.
Slide in the shaft part way at first.
Then a collar, the pivot, another collar and finally into the other side of the column. As of now both collars on the pivot shaft can be snugged up. Leave a tiny bit of play so they don't bind. The big set screw in the pivot is kept loose. We'll see why in a minute.
This is the pin for the crank arm to pivot interface. Mind the flat spot for the set screw in the crank arm.
Here it is all hooked up.
Now install the plate that holds the sliding block in place.
Now you can let the crank arm slide on the sliding block to check for rubbing. I let it protrude through the top of the column as I slid it back and forth. At first it was rubbing the brass washer behind the sliding block.
You can slightly adjust the left - right position of the whole crank arm assembly by sliding the pivot arm on the pivot shaft.
It'll only move a slight amount but if the crank arm assembly is too far to the left it will rub on the big brass washer/spacer. Also the inside of the crank arm cover (the one with the oil hole) will rub the sliding block. I ended up pushing the whole assembly as far to the left as possible then just pulled it back to the right a tiny amount, snugged up the set screw and checked the motion of the crank arm. I repeated this a few times until I could perceive no rubbing anywhere. It very smooth now!
Slide in the shaft part way at first.
Then a collar, the pivot, another collar and finally into the other side of the column. As of now both collars on the pivot shaft can be snugged up. Leave a tiny bit of play so they don't bind. The big set screw in the pivot is kept loose. We'll see why in a minute.
This is the pin for the crank arm to pivot interface. Mind the flat spot for the set screw in the crank arm.
Here it is all hooked up.
Now install the plate that holds the sliding block in place.
Now you can let the crank arm slide on the sliding block to check for rubbing. I let it protrude through the top of the column as I slid it back and forth. At first it was rubbing the brass washer behind the sliding block.
You can slightly adjust the left - right position of the whole crank arm assembly by sliding the pivot arm on the pivot shaft.
It'll only move a slight amount but if the crank arm assembly is too far to the left it will rub on the big brass washer/spacer. Also the inside of the crank arm cover (the one with the oil hole) will rub the sliding block. I ended up pushing the whole assembly as far to the left as possible then just pulled it back to the right a tiny amount, snugged up the set screw and checked the motion of the crank arm. I repeated this a few times until I could perceive no rubbing anywhere. It very smooth now!