08-07-2019, 08:06 PM
I must admit I have been reluctant to turn my carrier faces to try and eliminate my run out. I figured that if I try to correct then the planet wheel holes will become less true to the pin axis.
Yesterday at Beaulieu I found an early diff carrier with a very good, and pitting free, crown wheel. One broken half shaft as well but no pinion. £40 though.
I thought id wash it and test the run out but this time I put a small marking out table across the lathe bed and then placed the diff carrier assembly vertically sat on the thrust bearing on the plate and with a suitable preload weight on top. When the carrier is in the axle assembled, I think the 4 thou preload is more simulated than I was trying by loading the two hub type bearings outers, The mag mount DTI sat on the lathe saddle to bear on the rear of the crown wheel face. A 1 thou run out found.
Ive swapped the new crown wheel to my other original carrier and have the same 1 thou. I do think it may be the pitting on my original despite my best attempts to avoid it.
I'm glad now I wasn't smart enough to figure out how to skim the carrier.
I also had a master class in setting up the axle from a very knowledgeable type. I don't think my run out is worth worrying about .
Jack French's 1953 notes in the companion suggest 4 thou and you should start looking in the bulletin advert- tricky nowadays though ?
charlie
Yesterday at Beaulieu I found an early diff carrier with a very good, and pitting free, crown wheel. One broken half shaft as well but no pinion. £40 though.
I thought id wash it and test the run out but this time I put a small marking out table across the lathe bed and then placed the diff carrier assembly vertically sat on the thrust bearing on the plate and with a suitable preload weight on top. When the carrier is in the axle assembled, I think the 4 thou preload is more simulated than I was trying by loading the two hub type bearings outers, The mag mount DTI sat on the lathe saddle to bear on the rear of the crown wheel face. A 1 thou run out found.
Ive swapped the new crown wheel to my other original carrier and have the same 1 thou. I do think it may be the pitting on my original despite my best attempts to avoid it.
I'm glad now I wasn't smart enough to figure out how to skim the carrier.
I also had a master class in setting up the axle from a very knowledgeable type. I don't think my run out is worth worrying about .
Jack French's 1953 notes in the companion suggest 4 thou and you should start looking in the bulletin advert- tricky nowadays though ?
charlie