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Dezza

SPONDON ALLOY FRAMES - IMPERIAL FASTENERS

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Does anyone else have any imperial fasteners/bearings on their Spondon? I have just got back to faffing about with mine and the suspension linkages have a mix of what appears to be metric and imperialO.o What is clearly an old corroded spherical bearing pressed into one linkage is definately not M10 nor is it M12; it's inbetween, 7/16 I think. The rod end bearing on the same component is also the same size as is the bolt. The other parts of the linkage though are all metric as expected. This makes my head hurt as I am not American. I am going to have to fish out my grandad's thread gauge from a box of ancient tools in the shed, and he died in 1969.

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Rod ends and spherical bearings are virtually all imperial due to the fact that 99% of them are  designed and produced for the American aviation industry. 

Metric variants are fucking expensive.

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That probably explains it then. I am still curious to know if this is a general trend with Spondon frames though.

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Sweary Bob's  drawings, designs and collaborations with Phase One regularly mixed Imperial and Metric dimensions.

Things like spindle diameters are quoted in mm with tolerances in Thou.

Lengths are often described as 18" + 5mm.

Proper Engineering.

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Ive got a mixture on mine too. Like Dupersunc  says probably due to what was readily available at the time. And Bob liked to be different

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OK, I now know for sure that I need to source two new metric roller bearings, a new imperial spherical bearing, and some new nuts and bolts in both metric and imperial:)

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7 minutes ago, Dezza said:

OK, I now know for sure that I need to source two new metric roller bearings, a new imperial spherical bearing, and some new nuts and bolts in both metric and imperial:)

Its all part of the fun. 

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Just got 2 FAG 3021s for 45 quidO.o for the linkage. There are cheapoer ones but, and I am not kidding, these are used on the wheels of golf trollies. Golf, FFS, a good walk spoiled etc.etc.etc.

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