Boring bar advice. (moved from another thread)

I have a steady rest to support the piece. I hadn't planned on making any big cuts at 1500 RPM. I'll figure it out.
 
benmychree said:
He has stated that the bore is to be about 8" deep in a bar that is 10" long, so line boring is not an option, and creating a initial hole to subsequently bore is still a insurmountable problem is no steady rest is available. Also, the boring bar to finish the (blind) hole would need to be nearly as big as the finished hole to have the necessary rigidity to accurately finish the hole; a reamer would possibly be the best method for finishing the bore.
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a 10 " part should be able to be line bored on a 36" lath bed I would have thought, the holes could be roughed on a drill press perhaps then bored for alignment, he didn't say the OD had to be concentric so that will make it a lot easier.

Just thinking as you say that trying to stick a boring bar 10 " down a pipe may lead to errr, issues :)
 
stupoty said:
a 10 " part should be able to be line bored on a 36" lath bed I would have thought, the holes could be roughed on a drill press perhaps then bored for alignment, he didn't say the OD had to be concentric so that will make it a lot easier.

Just thinking as you say that trying to stick a boring bar 10 " down a pipe may lead to errr, issues :)
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Stupoty, It has to be between 7"-8" deep. Yes I understand the bar flex issue. I actually was thinking about making one out of a piece of titanium that I have. I WILL make this happen. I will post pics of the carnage and progress. I appreciate everyone looking out for myself, my lathe's and my workpiece's safety. Trial and error baby! Thanks
 
From what I can pick up on with his details here’s acouple things. Your gonna want a radius on the end of bore. A squared bore isn’t desired in this application. Think about doing a two piece setup. Line bore your 8” pc. Then make yourself a cap radius in the center to match bore diameter. Bore a charge recess. Make a stepped flange on the matting surfaces for pressure. I would weld the cap personally but with proper studs and meat on diameters it can be bolted. Fun project I’ve debating making many of times.
 
bigloudvtwin said:
Stupoty, It has to be between 7"-8" deep. Yes I understand the bar flex issue. I actually was thinking about making one out of a piece of titanium that I have. I WILL make this happen. I will post pics of the carnage and progress. I appreciate everyone looking out for myself, my lathe's and my workpiece's safety. Trial and error baby! Thanks
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sound interesting, remember photos.

I bored a hole last week, just to small for the biggest boring bar I have and just a bit too long for the one that fitted in the hole. Often the way :)
 
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