Hi guys
Here are a few pictures of some of the last little details to finish up the oilers.
The sight glass retainers were threaded in the lathe and after the front chamfers were put in, they were parted off. To keep from having to do a second operation in the lathe, the back chamfer was also put on before the retainer was parted.
The screwdriver slot is being milled using a .03” carbide end mill and collet fixture.
A pair of retainer nuts ready to be added to the oiler.
The vent pipe is .062 K&S tubing and while the originals were threaded I chose not to go down that road. A 3/32” collar was turned and pressed on the bottom end of the vent pipe which will press into the oiler body.
To keep the bends the same I designed this little 3d printed hand bender. I winged it on how much over bend would be needed to account for the spring back of the brass tubing. I got within a couple degrees and after a CAD tweak and running another set of parts, they were right on.
The studs that make up the 4 posts were cut to length and threaded 0-80; I used 1/16 brass welding rod and while they look a little rough in the picture they do polish up nicely.
The nuts that hold the top cover on, are a flat top acorn nut. A piece of 0-1 tool steel was used to make the cutter and after setting it on a compound angle for clearance; the profile was milled using a .015” carbide end mill.
After hardening and stoning the top of the form tool; I was very pleased how it performed. The tool cuts the top, 2 radii and the very small bevel on the top of the hex.
The nuts were first drilled, chamfered, and threaded using a roll form tap; then parted off. Then the blank is screwed onto one of the studs held in a collet and screwed up against the collet for the length stop.
Here is an assortment of completed nuts; let’s hope Lincoln doesn’t sneeze.
Getting close to assembly time.
Thanks for checking in.
Dave
