Pipe outer dia is 10 millimeter and inner dia is 9 millimeter. Bearing balls will circulate through this pipe. So inner diameter all along has to be without deformities. There are 2 bends at 90 degrees at 51 millimeter center distance apart. Would somebody help with the method. We need 4 such bent pipes.
As far as I can tell the bends are quite sharp, which compounds the problem. Maybe you can have larger radius bends with a different configuration that works. Pipe benders often make little waves in the tube at the bend. The combined ideas of filling the tube with sand, or a special spring like insert to fill the pipe, and using a pipe bender, and maybe heating the pipe with a torch will help you to do it, especially with a bit of practice. You can only try. Also consider copper pipe as copper is more malleable.
As this is quite small, you could cut semi-circular channels in suitable plates with a milling machine, and then assemble the plates to form a tube. This is easier with an NC mill, and can be as accurate as you need.
If you are in the US the link below is a company that may be helpful. The page describes the various methods. A phone call will let you know what they can do.
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