http://www.aulro.com/afvb/projects-t...-design-6.html
here is another option
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http://www.aulro.com/afvb/projects-t...-design-6.html
here is another option
I went a different route in mounting range rover axle spindles and brakes on a 40mm square axle for my camper trailer. I had the ends of the axle shaft turned down to a push-fit inside the spindles, then welded the spindles on once in place on the shaft. This leaves the flange free to use for mounting brake calipers- I cut down a pair of swivel housings for that purpose. This works an absolute treat and I would certainly do it again- especially now that I have a lathe big enough to do the entire job myself. Which brings up another point- how does one get the flanges that have been welded to the ends of an axle shaft, absolutely square to the shaft? You would need a lathe with a spindle bore of about 200mm to face the ends square once in place- which leads me to suspect that they are welded on as square as possible and that would have to be 'near enough'.
Would require a machine about 2000 between centres, I guess the places that do trailer axles may have machines that long. I would certainly want to ensure that the flanges were faced otherwise a crabbing trailer and excessive tyre wear would almost certainly result.