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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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Machining a square section O ring groove
I need to machine a round billet of stainless steel on its flat face with a
square section groove to take an O ring. The OD needs to be about 60 mm, the ID 50 mm and the depth of the groove 4 mm. I have a smallish (11 inch swing Harrison) lathe and a Bridgeport universal mill, but very limited tooling as I am a novice. What is the easiest way to attack this, the billet is cicular on its OD, can be gripped in the chuch of the lathe, and the groove will be concentric with the OD. I also have hand wheel roatable table for the Bridgeport, although I haven't used it and am not even sure of its proper name....rotary table? I would probably have to buy or make a cutting tool for the lathe as I see nothing obviously suitable amongst the stuff I have. Thanks, the thing I need to groove was expensive and I don't want to wreck it going in blind. Thanks. |
#2
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Machining a square section O ring groove
you should be able to cut this on your lathe using a "trepanning" tool - you
can grind your own "Chris Wilson" wrote in message ... I need to machine a round billet of stainless steel on its flat face with a square section groove to take an O ring. The OD needs to be about 60 mm, the ID 50 mm and the depth of the groove 4 mm. I have a smallish (11 inch swing Harrison) lathe and a Bridgeport universal mill, but very limited tooling as I am a novice. What is the easiest way to attack this, the billet is cicular on its OD, can be gripped in the chuch of the lathe, and the groove will be concentric with the OD. I also have hand wheel roatable table for the Bridgeport, although I haven't used it and am not even sure of its proper name....rotary table? I would probably have to buy or make a cutting tool for the lathe as I see nothing obviously suitable amongst the stuff I have. Thanks, the thing I need to groove was expensive and I don't want to wreck it going in blind. Thanks. |
#3
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Machining a square section O ring groove
On Sun, 27 Dec 2009 17:29:21 +0000, Chris Wilson wrote:
I need to machine a round billet of stainless steel on its flat face with a square section groove to take an O ring. The OD needs to be about 60 mm, the ID 50 mm and the depth of the groove 4 mm. I have a smallish (11 inch swing Harrison) lathe and a Bridgeport universal mill, but very limited tooling as I am a novice. What is the easiest way to attack this, the billet is cicular on its OD, can be gripped in the chuch of the lathe, and the groove will be concentric with the OD. I also have hand wheel roatable table for the Bridgeport, although I haven't used it and am not even sure of its proper name....rotary table? I would probably have to buy or make a cutting tool for the lathe as I see nothing obviously suitable amongst the stuff I have. Thanks, the thing I need to groove was expensive and I don't want to wreck it going in blind. Thanks. If that nasty old rotary table confuses you, I'll take care of it for you :-). Trepan. You need a trepanning tool, which is much like a cutoff tool except that it accounts for the curve of the cut it makes. Then you get to find out how rigid your lathe is. -- www.wescottdesign.com |
#4
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Machining a square section O ring groove
On Dec 27, 12:29*pm, Chris Wilson wrote:
I need to machine a round billet of stainless steel on its flat face with a square section groove to take an O ring. The OD needs to be about 60 mm, the ID 50 mm and the depth of the groove 4 mm. I have a smallish (11 inch swing Harrison) lathe.... If you aren't comfortable cutting straight in with a square tool you could grind a triangular bit like a threading tool but about 20 to 30 degrees between sides and cut in a little at a time with it. Angle the tool so only the tip cuts, run in with the carriage until it starts to complain, back off a little and cut in or out almost to the other wall. Once you have roughed out most of the groove you can use a square-ended bit narrower than the slot so only one side cuts at a time. The pointed tool I use is rounded on the end and nearly flat on top so it cuts in both directions. The angle is ~30 degrees. I use it to rough out belt grooves on mandrel-mounted pulleys, which won't stand much cutting force. jsw |
#5
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Machining a square section O ring groove
On Dec 27, 9:29*am, Chris Wilson wrote:
I need to machine a round billet of stainless steel on its flat face with a square section groove to take an O ring. I would probably have to buy or make a cutting tool for the lathe as I see nothing obviously suitable amongst the stuff I have. You'd best use HSS and low cutting speed, and the lathe is definitely better than the rotary table and mill. The O-ring has to seal against the bottom face, so the finish of that part of the cut is critical. Sidewalls don't need to be exactly at 90 degrees, usually they're low-tolerance. |
#6
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Machining a square section O ring groove
Is the O ring groove on the inside diameter of the big tube? If so I have done it the wrong way in the past. I think to cut a gland, you are supposed to have a boring bare bit ground to the correct width, and just make one cut. |
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