Pumpy the Younger

thingiverse

Another oil pump upgrade, this one is better than the last. It should work with 3/4" PVC electrical conduit and female threaded adapters. Use regular water line PVC female threaded adapters instead of conduit threaded adapters because they don't have tapered threads like water pipes do. This version only needs a cross hole to attach the piston to the end of the 1/4" rod. You'll need: * 3/4 PVC Shc 40 * 2 x 3/4 female threaded adapters * 1/4" steel rod - ground or polished (or 6mm if using that version) * 1/8" or 3mm packing string for the packing gland * 20mm x 2mm O-Ring for hose barb fitting * 3 x 21mm x 2mm O-ring for piston * 2 x 30mm x 3mm O-ring for top and bottom * 1/4" shaft collar to preload spring (or 6mm if using that version) * Spring for valve - something just over 10mm ID, with a few pounds of force. Can be adjusted some by position of shaft collar * 5/8 or 16mm steel ball for intake valve * 2 x 1/8 or 3mm screws to use as cross pins on piston and handle Use "NoSupport" piston or "Packing" piston, supports on these grooves will be a bear to remove without damage to piston. The top needs supports to build plate only, if your printer can handle the horizontal threads without them. Otherwise about 70° here should help, and the support can be unscrewed. The hose barb will need support as well of course, keep the barb facing down and support should slide off after cracking loose. The O-rings on the top, bottom, and hose barb may be able to be replaced by a few wraps of Teflon tape. The piston O-rings will pretty much be mandatory though. The 3/4 pipe will need chamfered on the end where you'll be inserting the piston so the O-rings have a smooth entry. The female threaded fittings should be glued onto the pipe and allowed to dry before assembly begins. Your 1/4" rod needs a 1/8" cross hole drilled about 1/8" from each end to attach the handle and the piston. 05/08/2018 Added files with enlarged holes for the 1/4" rod. These were too small for 1/4" rod, but should fit 6mm pretty well. If you want to use 6mm linear shafting, use the files that begin with "6mm." For 1/4", use the files that begin with "250." 05/09/2018 Changed the hose barb. Added a taper at the base of the barb. This makes the barb stronger and moves the support material out so it has more wiggle room when removing supports. Added a new foot design with a retainer to keep the inlet check ball from rising too far. Renamed the original files to "6mm" because they were undersized for 1/4" rod, but should fit 6mm pretty well. If you want to use 6mm linear shafting, use the files that begin with "6mm." For 1/4", use the files that begin with "250." 05/10/2018 Noticed a microscopic gap in the retainer model and fixed it. Added "MountHalf" file. This should clamp around the 3/4 pipe and provide 4x 8mm mounting holes on a 50mm x 50mm square. Should work nicely to mount pump to a bucket lid. Found another microscopic gap in the Foot_Retained model and fixed it. Tinkercad must do some rounding off of dimensions.