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> The challenge is to first ionize and "ignite" the air to make the > 30,000 deg plasma flame and then *control* it so it doesn't cook all > of the surrounding components. Most torchs have specially designed > swirl chambers to spin the air as it exits the tip. The torch handle > and it's design are what largely controls the quality of the cut. > > Hypertherm makes a "Fine cut" series of consumables for some of their > torch models that will hold .025 under perfect conditions, but .010 > is doubtful. When talking accuracy, there is theoretical (my driller has a step of 1/26,000 of an inch, but I doubt if I really get 0.02") and then there is real world. Jim Colt, an engineer at Hypertherm has the fine cut, high deffination in his shop. IIRC, a $35,000 machine, and he claims "you could probably fine tune the process and get tolerances of .005" with high definition" and... "1/2" wide x 2" long slots with radiused ends on 1/4" carbon steel plate could be cut with plus or minus approx .010" accuracy with a high definition oxygen plasma on a precision cutting machine. " And, in reading the notes, I think Caudlet is saying overall and Jim C. is saying plus or minus. That means to either half Caudlet's or double Jim's numbers. The question becomes one of cost. How precice can you afford to go ? Dave Addresses: FAQ: http://www.ktmarketing.com/faq.html FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/ Post Messages: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] List owner: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Moderator: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [Moderators] URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. http://www.metalworking.com/news_servers.html http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
