This drawing will help explain my conventions for naming parts
of the linkage:
This drawing will help explain my conventions for naming parts
of the linkage:
The robot chassis can be built using 3/16"OD spacers instead of standoffs. Spacers are more readily available at mcmaster.com. Hinges cannot be tightened around nylon spacers. If you build with nylon spacers, I do not think that lock-washers help. All connections to plastic should use a washer, but I would just use a screw and nyloc nut, or a nut held with Loctite or other glues. These connections must be snug, but not tightened.
If you build with metal spacers, you sould be able to tighten hinge screws, and use toothed lock-washers with flat washers. I prefer to use internal teeth on screw heads, external teeth under nuts.
I intend to complete a spacer-based build, measure all the screw lengths, and post a full BoM here in the near future.
For a complete chassis hardware setup, you will want
| Bit | Notes |
|---|---|
| #10 | free on 3/16" OD brass tube, used for B axle |
| #11 | free on 3/16" OD brass tube and spacer, if "polished" after drill |
| #12 | Snug (but not press-fit) on 3/16" OD brass tube, used for B axle |
| #30 | free on 1/8 brass, good for cranklinks, main |
| #31 | tight on 1/8 brass, as used on crank arm |
| #35 | snug, but free around #4-40 screw |
| #44 | free around #2-56 screw |
Last modified: Mon Oct 14 19:38:10 MDT 2013