Talk:Cosi measure new

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Revision as of 19:59, 12 October 2020 by Pomelo (talk | contribs) (→‎Part number 2.3 -- ~~~~: new section)
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-- Martin (talk) 13:27, 21 September 2020 (CEST)

- Software installation instructions couldn't be loaded from OHO's page ("Failed to load PDF document.")

- License is CERN OHL **v1.2**

- [source files]( for mechanical assembly (complete system) are missing

- [manufacturing instructions]( are missing → those are important to understand the mechanical assembly of the complete system as there're just Fusion360 files and PNG exports available

- bottom line in mechanical drawings is a little misleading :) → "This drawing is our property; it can't be reproduced or communicated without our written consent." → I'm seeing the CERN OHL v1.2 as such a written consent :)

Part number 1.6 -- Martin (talk) 13:37, 21 September 2020 (CEST)

please add dimensions

Re: Part number 1.6 -- Martin (talk) 13:50, 21 September 2020 (CEST)

Well, my assumption is that this is not an individual component for the mechanical assembly, but rather the material for self-designed components (aluminium plates). Hence bill of material and 'shopping list' are mixed. Nothing dramatic; for best practice I'd suggest to have

1. a neat bill of materials

2. an optional, separate shopping list

As said, nothing crucial. The relevant information is here.

Part number 1.25 -- Martin (talk) 13:40, 21 September 2020 (CEST)

"hexagon nut", not "screw nut" :)

Part number 1.16 -- Martin (talk) 13:55, 21 September 2020 (CEST)

length is missing

Part number 2.2 -- Martin (talk) 14:01, 21 September 2020 (CEST)

- Diameter for the 3rd hole (from the bottom left) is not specified. I assume it's also 5.5mm and needs a countersink

Part number 2.3 -- Martin (talk) 14:07, 21 September 2020 (CEST)

- I assume the ø16mm circles are the countersinks :)

Part number 2.5 -- Martin (talk) 14:23, 21 September 2020 (CEST)

- really no countersink for the ø6mm holes this time?

- diameter specification of holes is a little ambiguous, but one can guess from the drawing → shouldn't be a problem

Part number 2.8 -- Martin (talk) 14:35, 21 September 2020 (CEST)

- remove the second half of the note "Alternatively you can also make through hole …" → given that I bought the screws from the BoM, I'd rather make some threads :) (also: this note could be applied anywhere; unambiguous designs are better; skilled people may come up with personal deviations and forks themselves)

Part number 1 -- Martin (talk) 14:47, 21 September 2020 (CEST)

as mentioned in the `general review`, assembly drawing/instruction is missing

Part number 2.1 -- Pomelo (talk) 21:33, 3 October 2020 (CEST)

- The material for the plate is not specified, neither on the drawing nor in the table with the parts list (it is only mentioned in the assembly instructions in github)
- There are missing holes (8x?) and respective threads (M5?) on both ends of the drawn plate where plate 2? is meant to be attached (as observed in github)
- The dimension for the countersunk holes for the M6 screws is not clearly specified (or not specified) and the screws that belong in those holes are not identified with a position number on the parts list.
- It would be nice to see a drawing with a better distribution of the measurements to make it easier to read. Some suggestions: The holes should be represented by empty circles. The threads should be drawn around the holes. The part has a transversal symmetry that allows a reduccion of the number of written measurements. Modify the scale of the drawing to better fit the page or cut the part to allow for extra space on both ends.

Part number 2.2 -- Pomelo (talk) 21:55, 3 October 2020 (CEST)

- This part is symmetric. This can be use to declutter the drawing from redundant measurements and make it more readable.
- Not all holes diameters need to be there, specially if they are all equal. Add one measurement and make a note on the drawing to clarify.
- What is the optional countersink for? No need to specify diameter.

Part number 2.3 -- Pomelo (talk) 19:59, 12 October 2020 (CEST)

I am familiar with the complications of Free CAD in general and technical drawings are also a complex matter. It would be nice nevertheless to see a bit of consistency across the drawings when placing the measurements. Sometimes an isometric view in a corner of the drawing could help to give a better idea of how the part looks in 3D. Transparent/wire views also help to uncover some hidden features in simple parts.

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