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| Water Jet Processing |  |  | |
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| Posted by: dr ® 11/02/2009, 12:55:28 Author Profile eMail author Edit |
We have started to send out parts to water jet. Each time though I have to make new drawings, removing countersinks and change dimensions on holes for pem standoffs. Is this normal practice to make separate drawings, one for machine, and another for water jet? |
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| Posted by: jboggs ® 11/02/2009, 13:35:02 Author Profile eMail author Edit |
It sounds like you are just dealing with the facts of the limitations of water jet machining. Despite the numerous advantages, machining a counterbore or countersink with a waterjet is difficult, if not impossible. My question though would be this: if the finished parts are acceptable without countersinks, why are they even in there to begin with? They aren't free no matter what process you use. If your answer is that you go back and machine them later as a secondary process, then the comparisons should be on a total part cost basis. In my experience, the requirements to make separate drawings for each stage of machining varies from company to company. |
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| Posted by: dr ® 11/02/2009, 13:45:50 Author Profile eMail author Edit |
yes they have the major part of it water jet and then go back and rework holes if they need countersinks or what have you. i personal have the idea in my head that the dimension on the print is the dimension and you the machinist are in charge of holding this dimension. were it is up to you to control your machine. i understand you cannot not do counter sinks but the fact that there is a dimension on the drawing and you should be able to get within the specs with out me changing them each time it is sent to water jet. Maybe i am wrong here, I am not tryign to start an arguement just curious, i think i might ask a water jet company, thanks for all the input. |
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| Posted by: Marky ® 11/02/2009, 14:00:14 Author Profile eMail author Edit |
I think what jboggs is saying...you might want a drawing for each process. Rough Machine - Water Jet
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| Posted by: Kelly Bramble ® 11/02/2009, 15:43:37 Author Profile eMail author Edit |
Engineering drawing are supposed to define the requirements for the end-item part -what ever that is. If you have a design that will require several specialized manufacturing processes, a job shop or manufacturing engineer may create separate manufacturing drawings for each specialized manufacturing process. Internal manufacturing organizations that have diverse capabilities will often create a routing specification with any required manufacturing documents to get the end item. In this case, if you send an end item engineering drawing to an abrasive water jet job shop then they will need specific documents or instructions on what they are to manufacture. In other words - if the engineering drawing shows a counter-bore then they should deliver a part with a counter-bore manufactured to tolerance unless documentation specifies otherwise. |
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| Posted by: dr ® 11/02/2009, 15:54:05 Author Profile eMail author Edit |
THANK YOU ALL, THAT ANSWERS MY QUESTION, AND GIVE ME DIRECTION TO PROCEED IN THE FUTURE WITH OUT QUESTION, THANK YOU ALL... Modified by dr at Mon, Nov 02, 2009, 15:54:38 |
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| Posted by: jboggs ® 11/03/2009, 09:15:24 Author Profile eMail author Edit |
One other comment: Your boss may be telling you that you have to create a separate drawing when a part is done on a water jet, and he may have a very good reason for doing that. But it isn't because its a water jet. Its because it is a separate process, with its own quality and inspection requirements. For example, in machine design it is very common to create a drawing of a weldment and a separate drawing of the machining done to that weldment. Another example: I worked for an automotive manufacturer briefly. Engine parts went through numerous machining processes. They had a separate drawing for each step of the process. A crankshaft had 30 or 40 separate drawings, one for each machining process. This established clear criteria for acceptance or rejection at each stage. |
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| Posted by: Kelly Bramble ® 11/03/2009, 11:04:55 Author Profile eMail author Edit |
Everybody - see http://www.engineeringmotion.com/videos/337/abrasive-waterjet-machining-systems Abrasive Waterjet Machining Systems video |
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| Posted by: Marky ® 11/03/2009, 12:03:11 Author Profile eMail author Edit |
Tough getting old....just saw the video of all that water...now I have to hit the rest room. |
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