Machining 4140 HTSR Plates and Shafts скачать в хорошем качестве

Machining 4140 HTSR Plates and Shafts

Machining two plates and two shafts made of 4140 HTSR which are then joined with a press fit. Two plates (roughly 8" in diameter) are turned and faced on the lathe. An accurate hole is drilled and bored through the centre for a press fit with the shafts. A plate turning fixture I made about 15 years ago is used to turn and chamfer the OD of the plates concentric to the bore and square to the face. (each time I use the fixture I take a light facing cut to ensure it is square to the axis of the lathe). The plates then have a pattern of .75" and 1.75" diameter holes drilled, reamed or bored into them on the milling machine. The milling machine has no quill and therefore all feeding was done with the knee. Two shafts are then turned on the lathe. One end has an accurate diameter for press fitting into the plate. The other end has a 1"-20tpi UNEF thread. My customer couldn't supply me with the female mating thread to check the male thread I was cutting. Therefore I had to measure the pitch diameter using the three wire method. This is a tedious, but accurate, way of measuring the pitch diameter. (Much fumbling of wires and micrometer was edited out of this video.) Finally the parts are pressed together using a 10 ton hydraulic press. The interference was .001" and I estimate that it took about 7 tons to press them together. This should keep them together during their intended use. The assemblies will now be sent out for black oxide coating (not shown). Let me know what you think. This is by far the longest video I have made and I'm not sure if I'm including too much detail or not enough. Thanks for watching.