george wilson
05-07-2009, 3:24 PM
These are mostly quick and dirty threading tools I made when I needed them.
The double threading box was to make a kind of wooden caliper coopers use. they have a wooden bow,and a right and left handed threaded rod below the bowed top. This threaded rod has a handle in the middle. the caliper needs only a limited range of adjustment (and that's all it has).
The next group is of 4 taps I could lay hands on right away. The little one is a 3/8" tap I used on the embroidery frame I posted weeks ago,and may now be on page 12,unless it was saved in the FAQ section. I usually cut the threads with the metal lathe mounted with a router,which gives flawless threads for my very particular customers. The taps are made just to thread the holes.
3rd. picture is a closeup of how the taps cut. They have a hole drilled into the end of the tap,which the curl of cut wood comes out of. Then,a hole is drilled right at the end of the thread,and filed sharp enough to cut. Then,the tap is hardened. Works very well.
If I recall,these type taps were availably by 1820. I think they are the best,as you can easily keep them square when entering a hole.
The last shot is how the "V" cutting bits are mounted in the thread box. If you do not get these cutters good and sharp,slant their cutting edges forward,and get them at just the same angle,and in line with the threads in the back part of the thread box,they will frequently tear the threads off. Get them right,and beautiful results are had. I made the box out of walnut as it was handy at the time.
Once again,I need the tripod my wife took on her trip. The trouble with my small digital camera is,the button is hard to push,and always shakes the camera in closeups. No way to attach a cable.
The double threading box was to make a kind of wooden caliper coopers use. they have a wooden bow,and a right and left handed threaded rod below the bowed top. This threaded rod has a handle in the middle. the caliper needs only a limited range of adjustment (and that's all it has).
The next group is of 4 taps I could lay hands on right away. The little one is a 3/8" tap I used on the embroidery frame I posted weeks ago,and may now be on page 12,unless it was saved in the FAQ section. I usually cut the threads with the metal lathe mounted with a router,which gives flawless threads for my very particular customers. The taps are made just to thread the holes.
3rd. picture is a closeup of how the taps cut. They have a hole drilled into the end of the tap,which the curl of cut wood comes out of. Then,a hole is drilled right at the end of the thread,and filed sharp enough to cut. Then,the tap is hardened. Works very well.
If I recall,these type taps were availably by 1820. I think they are the best,as you can easily keep them square when entering a hole.
The last shot is how the "V" cutting bits are mounted in the thread box. If you do not get these cutters good and sharp,slant their cutting edges forward,and get them at just the same angle,and in line with the threads in the back part of the thread box,they will frequently tear the threads off. Get them right,and beautiful results are had. I made the box out of walnut as it was handy at the time.
Once again,I need the tripod my wife took on her trip. The trouble with my small digital camera is,the button is hard to push,and always shakes the camera in closeups. No way to attach a cable.