Smaller Box Tools for a smaller lathe

[greenie]

OK Al, you should be able to see what happens now -----------

Here's the 12BA box cutter with the front cover removed, showing the two pieces that make up each Box Cutter -

https://i.imgur.com/sPEo2c4.jpg

Simple as, no moving parts at all, the bronze rod just slips into the hole in the front cover, to make the rod stay where it should when it's being attacked by the toolsteel. The 4 cap screws are to adjust the 1/4 inch toolsteel, into an appropriate position, so that it can do it's job properly.


Down to business -------------------

Bronze rod sticking out of the chuck about 20 mm to make a 10 mm coachbolt, the front plate that supports the bronze rod is 10 mm thick, so 10 + 10 = ?

https://i.imgur.com/qdiJEXa.jpg

Move tailstock up so the rod touches the tooltip

https://i.imgur.com/6h6MQlE.jpg

Turn on lathe and start to crank the tailstock forward by 10 turns, remember 10 + 10 = ?

https://i.imgur.com/1vv9VFC.jpg

Remove tailstock and you have an un-threaded 12BA coachbolt by 10 mm long

https://i.imgur.com/bSEpbHP.jpg

OK, now to start to make the 12BA thread, the main pulley has a hole to take an old stuffed screwdriver cut down for a handle.

https://i.imgur.com/jhhFnrg.jpg https://i.imgur.com/KyvxAWK.jpg

Hold the 12 BA Die in your right hand firmly and crank the handle thirty odd times with your left hand, 12BA is about 3.4 threads per mm.

https://i.imgur.com/p6OVSp7.jpg

Bingo, one threaded 12 BA coachbolt fully threaded to 10 mm

https://i.imgur.com/IttEL3j.jpg

Cut it off anyway you can, so you can continue to make as many coachbolts as you might need

https://i.imgur.com/lJIKH9S.jpg https://i.imgur.com/mPiVeW5.jpg

Insert the unfinished coachbolt into a Pin Chuck, to be able to make the domed head on the coachbolts, then into it with a file to round the head off, to finish the miniature coachbolt

https://i.imgur.com/E12iF2Y.jpg https://i.imgur.com/jzXuDkg.jpg

After this, you have a completed 12BA by 10 mm long ready for use on a model.

https://i.imgur.com/ev6aJgM.jpg https://i.imgur.com/M322n2b.jpg



Hope that is enough explanation for you, if you require anymore, please let me know