A question about a metal lathe and cutting into the middle of the inside of a tube.?
The inside would be 1in then 2in then 1in. Is this possible and if so, any special tools needed?
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Yeah sure it’s done like this,on the lathe the pipe spins and the other end holds the bit in the chuck stationary,then they turn the spinning pipe into the bit that is stationary and slowly bore into the bit using coolant of course and thats it.My fathers a machinest,he wanted me to be one but i aint really into it.
I doubt you can find a tube with a thick enough wall to permit this type of cutting, you will probably have to start with a solid bar.
Assuming you start with a solid bar of metal, the tools needed are: The lathe with accessories, a drill bit, an ‘offset’ boring bar.
Yes it is possible.
Mount the bar in the lathe, drill a 7/8 hole (MOST bits drill a slightly oversize or ‘clearence’ hole for the size of bit.)
Use the boring bar to bring inside diameter to 1″.
Insert bar to the correct point and them move outward slightly and make a cut to the end point of the 2″ section, move bar to starting point, move outward again and cut again; repeat until done.
Another method, which could be somewhat easier is to use 3 tubes. 1 – 2″ID full length, 2 – 1″ID and 2″+OD, 1 the length of each 1″ID section. Cut OD of last 2 to the ID size of first piece using an “interference” fit.
Heat the larger tube and cool the smaller tubes. Insert the smaller tubes in the larger tube, and let temperature stabilize.
They SHOULD then be tight enough to stay together against a reasonable amount of force.
For better holding, or it they are a ‘slip’ fit, you could weld the tubes together at the outer ends and then ‘face’ them with the lathe.
Hope this helped.