Oh, it's so slow sometimes - sometimes it seems like days of work produces only a few parts! Here's some more progress:
A series of photos showing the front gear housing; first roughing out the mounting flange, then boring out the internal gear case, reducing the outer diameter and tapering for the front flange, then boring the holes for 10BA mounting screws:
A couple of days later I'm making the 1/4" nuts to fasten the tappet guides into the tappet rod housing. I made a few spares! The first picture is parting off a nut from the 1/4" hex steel bar, the old screwdriver is to catch it. I had threaded the bar before making each nut, but I found it best to run the tap through by hand after each was parted off and de-burred:
Then I started making the tappet guides from 3/8" phosphor bronze. Each guide is 5/8" long, tapped, relieved and bored for reaming with a 0.156" reamer. I've started making a few, I'm doing them in three operations, the first is to relieve the inward end and tap it, then cut it off from the stock. After that the part is screwed into a jig in the lathe chuck to have the centre hole drilled and reamed, then the outer profile turned. I think I'll use another jig to hold the part while the 0.062" slot is cut in the lower end to recieve the cam follower.
There's gong to be much excitement soon because I bought a Myford Super 7 lathe last weekend. I've been using a Drummond Roundbed for about 40 years very successfully, but this little nine-cylinder engine has started to highlight some of the shortcomings. When I was offered a Super 7 that was made in the same year as I was born I tried very hard to talk myself out of it, but failed. It's dismantled in my garage at the moment, there was about 4 pints of oil swimming around on and in the machine so a day with spanners and the parts washer has been necessary.
That's all folks!
A series of photos showing the front gear housing; first roughing out the mounting flange, then boring out the internal gear case, reducing the outer diameter and tapering for the front flange, then boring the holes for 10BA mounting screws:
A couple of days later I'm making the 1/4" nuts to fasten the tappet guides into the tappet rod housing. I made a few spares! The first picture is parting off a nut from the 1/4" hex steel bar, the old screwdriver is to catch it. I had threaded the bar before making each nut, but I found it best to run the tap through by hand after each was parted off and de-burred:
Then I started making the tappet guides from 3/8" phosphor bronze. Each guide is 5/8" long, tapped, relieved and bored for reaming with a 0.156" reamer. I've started making a few, I'm doing them in three operations, the first is to relieve the inward end and tap it, then cut it off from the stock. After that the part is screwed into a jig in the lathe chuck to have the centre hole drilled and reamed, then the outer profile turned. I think I'll use another jig to hold the part while the 0.062" slot is cut in the lower end to recieve the cam follower.
There's gong to be much excitement soon because I bought a Myford Super 7 lathe last weekend. I've been using a Drummond Roundbed for about 40 years very successfully, but this little nine-cylinder engine has started to highlight some of the shortcomings. When I was offered a Super 7 that was made in the same year as I was born I tried very hard to talk myself out of it, but failed. It's dismantled in my garage at the moment, there was about 4 pints of oil swimming around on and in the machine so a day with spanners and the parts washer has been necessary.
That's all folks!
