Continuing the theme of centrifugality (to forward reference a post I haven’t finished yet) I dusted off a box of castings that had been bought for me the Christmas before last. These were the pump kit supplied by Cringle Engineering[1]. The kit contains 3 aluminium castings; a brass impeller; a driveshaft and bearings, and some extras to make the flanges and pully. M3 nuts and studding are also supplied.
The whole lot went together like a metal puzzle with bits being machined to hold the parts only to be machined off again later. Much fiddling and fettleing later –more details in [2]– and a pump emerged with pipes to draw water from a copper tank, and deliver it back at a higher level. A motor from a defunct detailing sander provided the motion and after a couple of hours running-in it delivers about 8oz in 10s against a 12″ head [3].
[1] Cringle Engineering Pump Kit
[2] GoogleDoc on Details of construction
[3] Video on youtube
philbarber2 