Topic: Acuracy Question

[craigr]

First off, we hardly ever draw to scale. What I know, I have 'figured out' or asked you folks. So, that being said.....

In the attached, you will find two 2 examples of measurements. - why are they different?

How does one set the accuracy on CAD?

I thought everything in CAD is accurate right down to a 'T'.

[Lee Mac]

DIMLFAC?

[craigr]

Mine is set at 1 - What should it be set at?

[mjfarrell]

1

however



I would suggest one not draw 'to scale'  O VALUE in doing cad to anything other than real actual dimensions in model space.

[craigr]

perhaps my terminology is wrong.

The rare times I need to draw items like this, I draw them 1 to 1. - I don't scale them down or up for, as an example 2 to 1.

I just want my dims to be dead on accurate, not just 'kinda close'. or 'rounded off'.

[mjfarrell]

perhaps my terminology is wrong.

The rare times I need to draw items like this, I draw them 1 to 1. - I don't scale them down or up for, as an example 2 to 1.

I just want my dims to be dead on accurate, not just 'kinda close'. or 'rounded off'.

then dimlfac of 1 it is for you

also check all setting inside your dimension style(s) and UNITS to ensure that rounding is NOT happening beyond your desired level of 'accuracy'
if that is three or four decimals, or down to 64th of an inch.

[craigr]

I see it now.

Thanks

[tedg]

Anyway you can post this drawing?
The dimension seems a bit off, not sure what it's snapped to, vs what you measured to.


Or maybe its a "drawing units" vs "dimensions tolerance" thing, (or dimlfac) ?

[craigr]

It is a high-Security Government project.

Thanks for the offer of help though. - You are right about the snap thing. I think I was moving too fast because it is not on snap at all. I noticed that on a couple other dims in the drawing.

As I was going over what I had done, I was ashamed of what I had put out. - I know better.

I was simply in a hurry, and this usually ends up biting me every time.

Thanks again.

[Squirltech]

perhaps my terminology is wrong.

The rare times I need to draw items like this, I draw them 1 to 1. - I don't scale them down or up for, as an example 2 to 1.

I just want my dims to be dead on accurate, not just 'kinda close'. or 'rounded off'.

then dimlfac of 1 it is for you

also check all setting inside your dimension style(s) and UNITS to ensure that rounding is NOT happening beyond your desired level of 'accuracy'
if that is three or four decimals, or down to 64th of an inch.

+1

Dimension styles and Units

[mjfarrell]

It is a high-Security Government project.

Thanks for the offer of help though. - You are right about the snap thing. I think I was moving too fast because it is not on snap at all. I noticed that on a couple other dims in the drawing.

As I was going over what I had done, I was ashamed of what I had put out. - I know better.

I was simply in a hurry, and this usually ends up biting me every time.

Thanks again.

The TAB key can be your friend, to verify WHAT and or WHERE you are snapping to.

TAB<TAB<TAB<TAB