dpc wrote:Heh, in the end (for this scanner application), it' probably won't make a bit of difference where the bearing is so whatever reduces the parts count and makes it easier to machine is probably the design to use.
Q: From that sketch you've posted, the only thing keeping the arms from coming apart is the press-fit of the bearing on the left arm. I had thought at one time you used a retaining washer and wood screws on the inside of the arm that captured the bearing into the counter bore to prevent this?
Yeah, but If you can get a good press-fit the retaining screws are over-kill IMO.
dpc wrote: Just throwing out another idea - use a socket head cap screw and run it through the arms in the opposite direction. The counter bore in the left arm then could be much smaller as you won't need clearance for a socket to tighten the nut.
Uh-huh. Good one. They spec a button head cap screw anyway.