I still working on the test assembly of my kit for the book scanner, now the craddle angle is ok. How about the the bearing pocket in the levers arms ?
Since I have only bearings pockets on one side of the levers arms I have to take a decision.... My bearing pockets are far from a press fit don't even think about a thumb fit bearings, they have 0.014" free play, epoxy or lock tite ? I think it won't work in this case....
I take the decision to keep the original design of two bearings heres how I do it:
First a I use Fostner bit to tackle this job on an old Poitras (1960) mortising press drill, this press drill have a kind of milling table with an X , Y and Z axis... I could used my Bridgeport to do it but I hate doing woodwork on my machinist tools, they are not done to do that and the speed are to slow...
I first use a 11/16 fostner bit to center my work since the levers arm was already have this hole in it and this is the one I have to take as a reference from.
Here's a photo:
After this I used a 7/8" fostner bit for the bearings pockets.... I Know, I know, 22mm is 0.866 but my bearings pockets are already off by 0.014". Hey !!! this levers arm are not made to be used to land anything on the moon.
But I make sure I don't do any error in the centering, with the 7/8" bit, i first turning it by hand to make sure I'm well centered.
Here's a photo:
I do all my pockets bearing this way and it is working in a design of two bearing per arm...
I know Rob you wanna go with one bearing per arm, I'm 100% behind you with this idea, much more easy for the custom cutter and it will work as fine as two bearing for sure. We or you just have to make it clear in the instruction for the customs cutters that the pockets bearings have a strict measure of 0.0863 or any other press fit you choose.
Can you adjust the design with one bearing so we can use the bearing spacer that come in a kit like this one, instead of of a pile of washers or a nut??
The bearing kit I buy come with 8 spacers (0.415 + 0.275 for the bearing =0.680)like this one:
Oh by the way I'm not using 5/16" washer, they are to big, I'm using a 1/4" washer here's a photo, they fit perfectly on the bearing and on the 5/16" bolts:
To be continue....