Press fits

Owned by Leif Blake (Deactivated)
Jul 14, 2021
2 min read

What is it?

A press fit is a method of attaching 2 parts together using an interference fit. Often, the parts are of circular cross section, and the shaft is of a slightly larger diameter than the hole it needs to fit into.

Where on MSXIV?

The following press fits need to be completed:

  • Bearings into Hubs (note that the 6909ZZ previously ordered are the wrong part, need to wait for 6908ZZ to arrive)

  • Dowel pins into Hubs (ensure correct length from CAD)

  • Spindle into Upright

Tips

  • The 6906ZZ bearings are already in the hubs, as are some dowel pins. The shop staff can give you guidance, but these are relatively easy press fits. The dowels can simply be pressed in using a vise, but be careful to get them perpendicular to the hub.

  • Note that the ASC committee has informed us that the press fit of the dowels is insufficient to keep them in place. As such, we must get the dowels welded to the hubs on the backside (away from the rims). It doesn’t need to be a big weld, just a little touch. The dowels aren’t coming out on their own.

  • CRITICAL: The dowels need to be pressed in far enough such that they don’t protrude above the surface of the rims onto which the hub nut attaches.

  • Spindle into upright

    • This may be difficult, as the tolerances are not accurate. Measure the parts precisely , then talk to shop for guidance. Note that if necessary, we could remove a small amount of material from the spindles (if the press fit is too tight), as the press fit is not absolutely necessary for the design. But it should be snug.