I forgot last week that we had the Britcar Production race in the Lotus on Saturday, hence not too much done this week apart from cleaning up! I did however get a bit of time to look at the front ‘chopper’ wheel assembly.
The ‘chopper’ wheels needed spacing out 27mm from the axle to fit. This was also needed to mount the sensor as otherwise it needed to go through the middle of the upright. This solution does require a slight mod to the upright, but only at the very thin edge where there is no real stress (I hope).
The other consideration was that the wheels needed to be concentric with the axle otherwise the sensor might not pick up the teeth correctly, so it was decided to spigot everything together. I actually considered quite a few different solutions to this whole design, but I think this is the best and easiest to make.
So I turned up the above ally spacer. You can see that this has a female face closest to the camera where the male from the axle will fit.
I then turned a small portion of the internal axle face away, although I dont seem to have a picture of this, to create the male spigot to go in side this female face. I then turned my attention to the wheels themselves. These are 10mm steel so are quite heavy so I wanted to make the bore as large as possible to reduce the mass. You can see the difference below.
You can see below the final arrangement. Each spigot to the other and the whole thing runs concentric.
To reduce the mass still further I then turned the internal face of the wheel away. As this take no load there is no worry of it breaking, and I might drill some holes in it. All I need to do now is bolt the whole thing together, but unfortunately I had to leave as time was running out so this is a far as I got.
Tags: Sensors
