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| Allchine Bibcox |
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| sbwhart:
A friend ask me if i could make hime some Bibcoxs for his 1 1/2" Allchine traction engine, Bibcox is the old fasion name for a tap. This is the drawings Tiny little buggers arn't they. First make the D bit Slew the compound over 3 deg and turn a taper on a length of silver steel, give it a bit of a polish. Now so that the cox matches the taper in the body perfectly don't change the setting of the compound until the job is finshed. Section the D bit you want to make them just over centre Heat them to cherry red and quench in water, I didn't bother with tempering them. Give the flat face a rub on a smooth stone to get a nice sharp edge. I glued a collar round it to act as a stop. Then in a bit of 5mm brass bar on the centre, put through a 2mm drill then follow it up with the D bit to cut the taper for the body. Thats the hard bit done Mill a 2mm square on the cox. Chuck it up in the lathe and thread 10 BA and turn the tapere length, and the handle bit part off, and aneal it before bending the handle. Put the body in the lath assemble the cox and drill through 1.5mm: remove the cox and finish turn the rest of the body and thread 5/32* 40 ME again aneal before you bend the spout. To make the square hole washer make a 2mm square punch from silver steel just harden the square bit, turn up some brass washers with a 2mm hole in them and use the punch to knock the square bit out. Thats it Job done Stew |
| Bernd:
Nice one Stew. I want to know how you machined the end and bent it like that? Bernd |
| Rob.Wilson:
:bugeye: very nice Stew :clap: :clap: :clap: looks dam fiddly work :palm: Rob |
| saw:
As usual a very nice job :clap: :clap: :clap: |
| sbwhart:
--- Quote from: Bernd on February 06, 2012, 07:59:49 AM ---Nice one Stew. I want to know how you machined the end and bent it like that? Bernd --- End quote --- Very carfully :lol: :lol: :lol: :lol: :lol: I've broke quite a few Bernd I found the best way was to aneal them first, but a still got a few brakes, so bent it part way then reanealed the only problem is they have such a thin section you melt them :( --- Quote ---looks dam fiddly work --- End quote --- You can say that one again. Some more set up pics Turning the taper and 10ba thread problem was getting the compound back to the same pint ended up putting a stop on it, you just had to turn engough taper so that the square pockes through the hole. Also rigged up a magnifier, I also found that blacking the bit with felt tip help in seeing what was happening After turning the taper seat pulled them out of the chuck a bit and turned the taper for the handle. Parted them off anealed them and bent the handle this is only a part bend, I may leav them like this or aneal them again for another bit of bending. Assembled them in the bit that will make the body and drilled through 1.5mm so the hole will line up I'm making a few more so I'll post some more pics when I do the bodies. Stew |
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