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How to convert from mm to Inches

42 REPLIES 42
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Message 1 of 43
gphillips
30945 Views, 42 Replies

How to convert from mm to Inches

If I have something that was designed in mm and should be in inches, how do you convert it. What I mean is, I have a part that should be 26 inches long but it is 26mm long. Is there a way to convert all the measurements.
42 REPLIES 42
Message 2 of 43
JDMather
in reply to: gphillips

You might be able to go into Parameters and multiply all of the dimensions or change all of the units. And Tools>Document Settings>Units tab.

Another method would be to Derive Component into a new part with Scale (I would only use this method if the part dimensions are set in stone).

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Message 3 of 43
Anonymous
in reply to: gphillips

There isn't a "fix this problem" command that will specifically convert a
metric part to the eqivalent numer of inches. One millimeter is 0.03937
inches so multiplying 1 mm by 25.4 would give you 1 inch.

If you open an empty part file (use the inch template) exit sketch and then
use the DERIVE COMPONENT command and apply a scale factor of 25.4 you ought
to get in the ballpark. The problem will be in the significant digits of
precision. You'd be better using 25.40000048 but even that will likely
result in some "noise" out in the area where engineers don't care but
computers do...

--
Gary R. Smith
Autodesk Inventor Team
Portland, OR
2.33GHz 2GB IBM ThinkPad T60p; XP pro SP2
ATI Mobility FireGL V5250 driver: 8.293.1.0
Message 4 of 43
Anonymous
in reply to: gphillips

"...metric part to the eqivalent numer of inches..."

add missing u and b as required... 😞
Message 5 of 43
gphillips
in reply to: gphillips

Thank you so very much Gary. That worked perfectly.
Message 6 of 43
SteveSmith5286
in reply to: gphillips

I have a similiar problem. Our company is to take control of 1500 to 2000 2004 Autocad dwgs. They will be in metric. I have been asked if they can be converted to inches. How would you approach this? I am using Inventor 2010 Pro.
Thanks
Steve
Message 7 of 43
pcunningham1
in reply to: gphillips

When you say 'Autocad dwgs', do you mean 2-d drawings? Do you mean they are dimensioned in metric?

-Paul Cunningham
Paul Cunningham
IV2008
Message 8 of 43
SteveSmith5286
in reply to: gphillips

Yes. They will be 2D and dimensioned in metric.
Message 9 of 43
pcunningham1
in reply to: gphillips

Your situation is diffeent from the original post.

What are you going to do with the dwg's in Inventor?
Paul Cunningham
IV2008
Message 10 of 43
SteveSmith5286
in reply to: gphillips

They will become our product and we will control the design. I just purchased Inventor last month.
Message 11 of 43
pcunningham1
in reply to: gphillips

Unless you are going to make Inventor models of the parts, and then generate Inventor drawings from the models, I'd say you probably just need to manipulate the dimension style in Autocad.
My Autocad is pretty rusty, though. You may have better luck in the Autocad discussion groups.
Paul Cunningham
IV2008
Message 12 of 43
BenjP
in reply to: gphillips

Steve,

if your plan is to draw all those parts in Inv you can just put a "mm" behind every dimension that you apply and Inv will give you the correct value in inch.

If your plan is to use the existing dwgs and convert them, I don't have an idea how that works.

BEN
Message 13 of 43
SteveSmith5286
in reply to: gphillips

What is this group? I'm new at this forum stuff. I was thinking the way you suggested but thought there might be a quick way to convert.
Message 14 of 43
SteveSmith5286
in reply to: gphillips

Thanks. That's good to know.
Message 15 of 43
JDMather
in reply to: gphillips

>I just purchased Inventor last month.

How much professional training did you purchase to go along with your purchase of professional software?

You can import 2d dwg into Inventor to create 3d (there is even a utility on labs to automate this) but I suggest you use the existing dwg to practice by creating from scratch in Inventor. As indicated you can start from an inch or metric template and in any file append any units needed to the values and Inventor will convert for you.

If you run into trouble start a new thread and attach your file here.

You might want to read this document http://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdf

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Message 16 of 43
Anonymous
in reply to: gphillips

this is the Inventor forum.

listing of all Autodesk forums

http://discussion.autodesk.com/forums/

AutoCAD forums

http://discussion.autodesk.com/forums/category.jspa?categoryID=8
Message 17 of 43
SteveSmith5286
in reply to: gphillips

Just the Essentials. I am also going to the Advanced Class in Jan. Good advice. i appreciate it.
Message 18 of 43
mzobel
in reply to: gphillips

It is my understanding that 1" equals exactly 25.4mm
Message 19 of 43
msklein
in reply to: gphillips

actually it's more like 25.39..... something as Gary said. not what your school teacher told you in school. They try and make things way to simple and do not explain that.
Message 20 of 43
JDMather
in reply to: gphillips

>actually it's more like 25.39.....not what your school teacher told you

Can you supply a source for this information?

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Certified SolidWorks Professional


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