04-01-14, 02:40 PM
I can't see your animation, but yes, in that condition the gear won't have engaged and you'll feel it "hasn't gone in". Bear in mind that the gear and dog will normally be rotating at slightly different speeds even if you've judged the required revs quite accurately. It's a gentle pressure that you are applying to the selector arm not a brief impact... after a tiny fraction of a second the dog will be aligned with the slot and be able to drop in.
It's why getting the gearbox into gear can be tricky when the engine isn't running, with no relative movement to help the dogs and gears align sometimes it won't go in unless you give the back wheel a nudge.
The slots the dog engages with are longer than the pinions on the dog itself, this increases the opportunity for the two to engage... this is where most of the slop in the gearbox drive train comes from (put it in gear and rotate the sprocket back and forth to feel it).
Synchomesh is an extra ring that drags on the gear to match speeds and blocks full engagement until the dogs are aligned. I don't think many bikes have those though, ours are simple crash boxes.