Re: 1924 Sport 136

Posted by Karl On 2024/5/17 15:58:32

I was initially unpleasantly surprised when I had the first rim on the balancing machine and checked the synchronism. The first rim had 4mm side runout and 3mm vertical runout. But further measurements show that all rims had exactly the same heights and sideways runs. Maybe someone here knows whether these irregularities also occurred on other rims from this production period. I suspect that this was a result of the production of the rims at this time. I had taken a closer look at the rims in their raw state and noticed that there may have been problems with the fit between the two components...outer ring and inner disk because sections of the inner ring between the rivets towards the valve tube did not lie exactly against the outer ring. I assumed that the two components of the rim were placed in an assembly structure, the inner disk was tapped into the outer ring and then the rivets were pressed in. Given the tolerances at that time, it could then happen that the inner disk was not able to fully fit against the outer ring after the rivet had been driven in, which led to deformations. (Towards the end, the parts of the inner disk did not fit smoothly against the outer ring). Given the speed that his vehicle reached, this may well have been within the accepted tolerance range. The fact that all 5 rims have pretty much exactly the same deviations from ideal concentricity cannot actually be a consequence of later damage. Does anyone know more about this??
In today's pictures you can see the inside of the rims, onto which I applied spray filler/Putty with the paint gun to fill the deep rust holes. The spray filler is a relatively harder filler after it has hardened. Good for stability…. bad for manual grinding. It takes me around 7.5 hours for 2 insides of the rims because I sand the filler down so far that only the holes remain filled. After applying marking powder, you can clearly see the deep spots of the rust holes. Whenever possible, I use my eccentric sander maschines. However, there are still enough areas that can only be sanded manually. It's especially funny between the rivets.

Karl

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