Groupe d’aide à la Cotation et à la Qualité

Recommendations for CERN drawings

EDMS 14353801. Dimensioning for repeated features

2. Coordinate tables for hole patterns

3. Dimensions on projected edges

4. Multi-sheets

5. Dimensions with centered tolerance

6. Hole positioning

7. Numbering of Welds

8. Engraving on a part or item

9. ISO Norms sticker

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1. Dimensioning for repeated features

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- Use «Detail» tool- No detail of detail !

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2. Coordinate tables for hole patterns

Position dimension

- Mostly permitted for water-jet/laser cutting => 3D model to be used by manufacturer- Don’t forget to use a general tolerancing- Be careful: the dimension table is not

associative with the 3D model

With “Hole Dimension table tool” (See FAQ here)

Traditional dimensioning

3. Dimensions on projected edges

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- Be as clear as possible => show projection lines!- Add them manually (see FAQ here)- 0.25mm, Dot-Dashed- Use «Detail» tool if needed

Ex 1

Ex 2

Or ?

4. Multi-sheets

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- Same sticker on all the sheets (see FAQ here)

- Part list must be only on the main sheet

- Every sheet has a unique CDD number

- Different sheet sizes allowed but the biggest one should be for the main sheet

- Drawings storage: see FAQ here

This component is described by ‘’x’’ associated drawings : - 1/x : ABCDEFGH0001 (main sheet) - 2/x : ABCDEFGH0002 - … - y/x : ABCDEFGH0ZZZ

Sticker

5. Dimensions with centered tolerance

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- Easy to implement on Ø- Future => 3D models

extracted with nominal dimensions

- Useful on lengths: Improve understanding when stacking components in assembly

Ex 1

Ex 2

YesNo

NoYes

5:1

5:1

6. Holes positioning

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- Avoid using tacit symmetry- Dimension component based on references which reflect the functionality.- Use as often as possible theoretically exact dimensions linked to the references

Yes

No

!!

Yes

7. Numbering of welds (for pressure equipment)

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Standard manufacturing drawing

If needed, create an additional drawing dedicated

to numbering of welds

Number each welding as:W010

(Welding) Incremente numberswrt 010, 020, 030….

- Create and store this new drawing as a multi-sheet

8. Engraving on a part or item

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No

Good

- Be clear what and where to engrave- For more info (asset ref), refer to another document (ex EDMS)- Don’t engrave on 3D models

9. ISO norms sticker

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- You can nevertheless use most recent ISO GPS Norms!Þ Contact us to be sureÞ Mention clearly the Norms you need to refer to

- According to how many requests we’ll receive, we could consider a dedicated training on most recent GPS ISO Norms !

Example:(ISO 1101:2012)

Don’t forget it!

(See FAQ here)

Groupe d’aide à la Cotation et à la Qualité

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Respect ISO Norms more than ever Be rigourous especially when needed Dimension to avoid any ambiguity and misunderstanding

Ask us when you needContact us: gracq.support@cern.ch

GrACQ on the web here

Recommendations for CERN drawings

EDMS 1435380