On Sun, Mar 1, 2020 at 11:27 AM, Tony Smith

<ajsmith1968@...> wrote:

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:

?

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:

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:

?

Let's take a detailed look at the?

ADVANTAGES OF CNC OVER CONVENTIONAL

I get a chuckle out of the arguments presented by both sides of CNC vs MANUAL machining. Hats off to the accomplishments to the abilities of all of you! You are ALL machinists! Celebrate!

I am so thankful the GOOD LORD blessed me to have both worlds in my own shop, and the good sense to know which to choose when a job comes in the door.

Denis

?

On Sun, Mar 1, 2020 at 11:27 AM, Tony Smith

<ajsmith1968@...> wrote:

?

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:

?

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:

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:

?

Let's take a detailed look at the?

ADVANTAGES OF CNC OVER CONVENTIONAL

?

?

?

WOW ALL!

???? I did not want to start a cat fight!!!? PLEASE read my post carefully. I have over 6,000 hours

experience on programing, setup and operating the largest 5 axis machine GMC had back in the early 80"s.

I saw my first CNC lathe at the Chicago Tool Show in 1960. Just two year ago I took a class on programming

live tooling on a CNC lathe.? The Lord has really bless me to see the growth of CNC from back when it was

punched tape point to point to what it is now.? Not an old grouch just well blessed.

??????????????????????????????????????????????????????????????????????? Bill Thomas

?

On 2020-03-01 18:26, dkmach2 via Groups.Io wrote:

I get a chuckle out of the arguments presented by both sides of CNC vs MANUAL machining. Hats off to the accomplishments to the abilities of all of you! You are ALL machinists! Celebrate!

I am so thankful the GOOD LORD blessed me to have both worlds in my own shop, and the good sense to know which to choose when a job comes in the door.

Denis

?

?

On Sun, Mar 1, 2020 at 11:27 AM, Tony Smith

<ajsmith1968@...> wrote:

?

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:

?

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:

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:

?

Let's take a detailed look at the?

ADVANTAGES OF CNC OVER CONVENTIONAL

?

?