Inch to metric conversion 1-1

[bostosh]

Hello and Good Morning,

How does one get a cad model designed in inches to metric 1 to 1 values, 100 inches = 100mm

I did a design in units(inch) thinking I can slam a conversion to keep the units and output metric units.

I do not wish to use the 1/254*.1 to get screwy metric values in an inch system units.

G21 at the machine?

Thanks,

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[Jim Dawson]

Why not just rescale the drawing by a factor of 0.03984063745019920318725099601594, but tell the CAM program that it is working in inches. That should give you the output you want in inches.

[ger21]

Depends on the software, but in some cases, you don't have to do anything.

[bostosh]

I designed in "units" thinking not to "set" mm and
sure I can do the scale factor
And get non-rounded numbers. which I used during drawing.
Oops. shoulda started out differently..

Does then, G21 tells the control that N000X000.000Y000.000Z00.000F000 is metric?
Yes/No?

Jim, Ultimately I'll get parts via 1/254

I used to pass a parameter to the postprocessor

[Jim Dawson]

Does then, G21 tells the control that N000X000.000Y000.000Z00.000F000 is metric?
Yes/No?

As far as I know, yes. Some air cutting might be in order to make sure of how things are going to react.

[bostosh]

Thank You, The client/customer freaked on this, when doing the volume calcs.
A online quote system couldn't comprehend the units
I needed a 100mm x 1mm piece of pyrex. not inches.
I'll look for a decimal place converter /shifter
Does the iges have it anyone.

[awerby]

What CAD program are you using? Usually, they have a way to switch from one system to another - look in "options", "properties" or "parameters". But if you're starting with an even number of inches, it's going to give you "screwy" numbers in mm, and vice-versa. (To get from inches to mm, multiply by 25.4).

[bostosh]

Thanks for the responses, guys.
I painted myself into a corner, I really thought this would be easier,

And here is a confession. for Andrew
I use Cadkey19 for reasons from very long ago in the 80's. ( I can hear laughing ?)
This Cadkey is a derivative, functionally a PC version of what was developed internally at the aircraft factory, on Mainframe

I found it !
SolidWorks Import Solution: Wrong Units in IGES Files? - SOLIDWORKS Tech Tips, Videos & Tutorials from Javelin

[Jim Dawson]

Thanks for the responses, guys.
I painted myself into a corner, I really thought this would be easier,

And here is a confession. for Andrew
I use Cadkey19 for reasons from very long ago in the 80's. ( I can hear laughing ?)
This Cad is a derivative, functionally a PC version of what was developed internally at the aircraft factory, on Mainframe

In this century ins there a Cad system which can do this. in - mm conversion?
I really was accustomed to picking up the phone and having the programmers add the function. mm/in

Most CAD software today will do this. But in your case, you'll have to go over to the teletype and punch out a new tape.

[bostosh]

Once again,
Science and technology overcomes fear and superstition

Open up file in Notepad+ Change " 2,2HIN " to 2,2HMM" save

I miss my punched cards, things were simple then.,

Thanks Everyone !