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ReWET: [CAD-CAM-EDM-DRO] ADVANTAGES OF CNC OVER CONVENTIONAL
开云体育Hi All: ???? This person has done a lot of detail work in this report but from my 60 years of design, machining, and building things from small parts to a multi station paint line I fine that he is to broad in his statements. 1) CNC is more precise then manual machining.? Not true because parts can be hand lapped to millions of an inch and CNC does not machine that close. 2) CNC repair is not expensive.? Let him try and fine a cheap repair man to come 30 to 60 miles to study the problem and change the parts on a CNC machine that is not running right.? Or to change a chip shield that requires special tools to get to the screws that hold it in place. ???? I make these comment from personal experience. ????????????????????????????????????????????????? Bill Thomas ?
On 2020-02-29 16:36, Queen Nanu wrote:
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开云体育To be fair, the article only claims accuracy for the CNC parts up to 0.0001”, ten thou not millionths. ? Having a bunch of machinists cranking out parts to 0.0001” all day long isn’t cheap either. ? Tony ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of idea2man
Sent: Sunday, 1 March 2020 6:12 PM To: [email protected] Subject: ReWET: [CAD-CAM-EDM-DRO] ADVANTAGES OF CNC OVER CONVENTIONAL ? Hi All: ???? This person has done a lot of detail work in this report but from my 60 years of design, machining, and building things from small parts to a multi station paint line I fine that he is to broad in his statements. 1) CNC is more precise then manual machining.? Not true because parts can be hand lapped to millions of an inch and CNC does not machine that close. 2) CNC repair is not expensive.? Let him try and fine a cheap repair man to come 30 to 60 miles to study the problem and change the parts on a CNC machine that is not running right.? Or to change a chip shield that requires special tools to get to the screws that hold it in place. ???? I make these comment from personal experience. ????????????????????????????????????????????????? Bill Thomas ? ? On 2020-02-29 16:36, Queen Nanu wrote:
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.0001 = 2.54 microns On Sun, Mar 1, 2020 at 7:23 AM Tony Smith <ajsmith1968@...> wrote:
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CNC machines can be designed to produce parts to 1mm accuracy, or 10nm accuracy or better. Designed according to task, and priced accordingly. But then they can do it all day and all night long.? Humans are only useful at machining or finishing parts(laboriously) where the CNC machine used wasn't ideal for the task, ie one with insufficient accuracy. In a debate like this, it would be more appropriate to select a task, and then decide if CNC or manual machining is better suited. Roland On Sun, 1 Mar 2020 at 16:52, Harko Schwartz <ncmeinc@...> wrote:
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开云体育I know that, but the person I was replied to didn’t mention microns, he said “be hand lapped to millions of an inch” ? The article didn’t mention CNCing to microns or millions of an inch, only 10,000ths. ? Tony ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Harko Schwartz
Sent: Monday, 2 March 2020 1:52 AM To: [email protected] Subject: Re: ReWET: [CAD-CAM-EDM-DRO] ADVANTAGES OF CNC OVER CONVENTIONAL ? .0001 = 2.54 microns ? On Sun, Mar 1, 2020 at 7:23 AM Tony Smith <ajsmith1968@...> wrote:
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开云体育Try hand lapping anything but flat surfaces and make 1000 pieces per hour or mor manually. I had a customer that quoted milling on a 1/4 inch square circuit board and he had to do 25,000 of them so he quoted $25 each quote was accepted. He was amazed and made a vacuum table to hold the parts and was making $3500 per hour so 8 days later all the parts were done on a CNC try that manually.On Mar 1, 2020, at 11:37 AM, Tony Smith <ajsmith1968@...> wrote:
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开云体育Sigh. ? I give up. ? Tony ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Harko Schwartz
Sent: Monday, 2 March 2020 4:03 AM To: [email protected] Subject: Re: ReWET: [CAD-CAM-EDM-DRO] ADVANTAGES OF CNC OVER CONVENTIONAL ? Try hand lapping anything but flat surfaces and make 1000 pieces per hour or mor manually. I had a customer that quoted milling on a 1/4 inch square circuit board and he had to do 25,000 of them so he quoted $25 each quote was accepted. He was amazed and made a vacuum table to hold the parts and was making $3500 per hour so 8 days later all the parts were done on a CNC try that manually. On Mar 1, 2020, at 11:37 AM, Tony Smith <ajsmith1968@...> wrote:
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