Made the oil pump today. Both the oil pickup from the sump and the oil gallery fitting in the crankcase are on the same side of the engine. So I had to do some creative oil routing in the pump so the fittings could be on the same side of the engine to simplify the oil tube routing.
I fly cut a piece of stock on both sides to the correct thickness, then cut the inside and outside features on the CNC router.
When I made the oil pump gears I beveled the edges of the gears, not a good idea for the oil pump gear as you do not want any leakage around the gear corners. Fortunately the gear were a little to tall, so I put them in the oil pump housing and fly cut one side….
then flipped the gears over and fly cut the other side flush with the oil pump housing.
The gasket between the oil pump housing and the oil pump cover should provide enough space for smooth operation.
Then I reamed the shaft holes…
Then I milled off the oil pump housing from the base stock. Drilled and tapped the holes for the oil line fittings.
Still need to deburr the holes with the counter sink tool, but I think the pump will pump.
The gear with the shaft turns counter clockwise, delivering oil from the bottom fitting to the top.