> Why on earth are the holes in the rocker pedestals, for the bolts,
tapered?
> So that the top of the rocker pedestal has a properly sized hole to
> accommodate the bolt, and that the bottom has an oversized hole much wider
> than the bolt itself? The entire length of the hole is rather cone like
> with a very visible taper.
>
> Quick measurements:
>
> Top, hole diameter: 10mm (0.39")
> Bottom, hole diameter: 12mm (0.47")
>
> Cheers,
>
> Kai (spending too much time staring at the pieces of his dismantled motor)
The pedestals are castings. One explanation is that the hole in the casting
is made by placing a sand core in the mold. The sand cores are made in a
mold and baked before they can be used. The cores are tapered so that they
will slide out of their mold. Brings back memories of working in a foundry
as a teenager --- a hot dirty thankless job. Did provide some motivation to
study hard at university so that I'd never have to do that job again. Then
I got married --- at times it's like working in the foundry.
Nelson Riedel
Granville, OH
76 TR6 (assembling after new paint)
68 TR250 (next project - new paint)
70 TR6 (all the parts in a pile ready to assemble)
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