Differential - First steps.... Another builder diff for reference. The first stage of cleaning up was completed, and the centre bore was opened up to 38mm, this was used to check the distances to the bevel gear bosses relative to the drawing below. Currently (photo right) the boss position has been slightly adjusted as the casting was not running completely true. The portion for the winch cable on the casting was quite close to finish size, so getting this to run true was key. I measured a difference of about 1mm between the bosses to centre so this re-adjustment should also reduce this. The area to be removed, marked in blue dye, is the portion for the winch cable, this will enable the pins for the bevel gears to be drilled out. At this stage it is still just preliminary roughing out, as the teeth for the gear still need cutting. However, as it's on the limit of the milling machine and may have to
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Burrell Traction Engine - Blog regards the construction of this engine from the start, progress is obviously slow, as each and every part is made from scratch or castings so it is not just a self-assembly project. Hopefully, this will inspire others to make a start on this popular engine.