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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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The Stuff from hell :-)
Got a job in our shop right now that I wish would go away. Putting a
2-3/4" hole 8" deep through a block of 718 Inconel. Shoving a spade drill through it takes a couple of hours(2-1/4") with a 1/2" starter hole first. The spade drill inserts will be toast when done :-) The turning and boring is slow but not to bad, 40-50 fpm. Also have to put 4 3/4-10 tapped holes in one end. The set-up time is the real killer on this stuff, took a couple of days to figure out the procedures. Hopefully no more glitches and we can finish up the rest of the pieces. |
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On Sun, 05 Dec 2004 04:59:25 GMT, machineman
wrote: Got a job in our shop right now that I wish would go away. Putting a 2-3/4" hole 8" deep through a block of 718 Inconel. Shoving a spade drill through it takes a couple of hours(2-1/4") with a 1/2" starter hole first. The spade drill inserts will be toast when done :-) The turning and boring is slow but not to bad, 40-50 fpm. Also have to put 4 3/4-10 tapped holes in one end. The set-up time is the real killer on this stuff, took a couple of days to figure out the procedures. Hopefully no more glitches and we can finish up the rest of the pieces. Sounds like a job for EDM Gunner "I mean, when's the last time you heard of a college where the Young Republicans staged a "Sit In" to close down the Humanities building? On the flip side, how many sit in's were staged to close the ROTC building back in the '60's? Liberals stage protests, do civil disobedience, etc. Conservatives talk politely and try to work out a solution to problems through discourse until they believe that talking won't work... they they go home and open the gun cabinets. Pray things never get to the point where the conservatives decide that "civil disobedience" is the next step, because that's a very short route to "voting from the rooftops" Jeffrey Swartz, Misc.Survivalism |
#3
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Gunner wrote:
On Sun, 05 Dec 2004 04:59:25 GMT, machineman wrote: Got a job in our shop right now that I wish would go away. Putting a 2-3/4" hole 8" deep through a block of 718 Inconel. Shoving a spade drill through it takes a couple of hours(2-1/4") with a 1/2" starter hole first. The spade drill inserts will be toast when done :-) The turning and boring is slow but not to bad, 40-50 fpm. Also have to put 4 3/4-10 tapped holes in one end. The set-up time is the real killer on this stuff, took a couple of days to figure out the procedures. Hopefully no more glitches and we can finish up the rest of the pieces. Sounds like a job for EDM Gunner Unfortunatly thats not an option :-( Burn time on nickel alloys would be pretty long, even if using thin tubing for an electrode. Plus the recast layer would be pretty hard as well, probably really screw up the inserts on the finish bore :-) Slow and steady on a good solid machine does the trick, and hss tools seem to work well, just have to keep an eye on them and resharpen as needed. |
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