Q-Factor as narrow as practical with and without a lathe :-)
- Thread starter stormbird
- Start date
DannyC
0
Update:
That small q-factor bottom bracket is to be bonded into a frame and not welded so the smooth finish wasn't going to help in that regard.
Clearly it needed to be knurled and that's an opportunity for more tools.
A budget (£13.99) knurling tool arrived last night at 8PM via Evri parcel delivery.
It was a single size knurling tool. I do have a 3-size knurling set but unfortunately because I am a lame-brain I got one with a 16mm square shaft and my tool holders are all 12mm .... Oops!.
Anyway, first time knurling-virgin that I am, I chucked up the part this afternoon and had at it.
This is not a deep and heavy knurl but you can feel that the surface is now as rough as a bears bum, so that's done.
I also made a small section of 16mm ID tube while I was at it.
The tube is to be cut into 2 slices to fit between the inner face of the crank arms and the inner race of the bearings on either side of the BB to prevent the bearings walking out like they did on the BB shell on Paul's pedal car.
That small q-factor bottom bracket is to be bonded into a frame and not welded so the smooth finish wasn't going to help in that regard.
Clearly it needed to be knurled and that's an opportunity for more tools.
A budget (£13.99) knurling tool arrived last night at 8PM via Evri parcel delivery.
It was a single size knurling tool. I do have a 3-size knurling set but unfortunately because I am a lame-brain I got one with a 16mm square shaft and my tool holders are all 12mm .... Oops!.
Anyway, first time knurling-virgin that I am, I chucked up the part this afternoon and had at it.
This is not a deep and heavy knurl but you can feel that the surface is now as rough as a bears bum, so that's done.
I also made a small section of 16mm ID tube while I was at it.
The tube is to be cut into 2 slices to fit between the inner face of the crank arms and the inner race of the bearings on either side of the BB to prevent the bearings walking out like they did on the BB shell on Paul's pedal car.
