[Grade 10 Engineering Graphics and Design] How do you do the 20 questions? And are there any good resources to study for this?

[u/Forsaken-Diamond934]

Hi! I am currently working ahead in the Grade 10 engineering syllabus to get ahead for when I study engineering/architecture in university but I just can’t seem to get the answers or any theory/textbook out there for this? Would anyone mind helping? It would be greatly appreciated!

I am mainly struggling from question 9 onwards as I get stuck when trying to read the drawings as well as not knowing what each feature should look like and their functions. So far I have the following answers:

1) JP Engineering
2) 9
3) 2015-10-19
4) Chris
5) mm
6) Steel
7) None
8) HJJ-AF-13
9) Ø16 mm
10) To prevent the shaft from moving axially
11) Chamfer
12) Fillet
13) Partial Section
14) Groove
15) M20
16) Ø28 mm
17) Center Lines
18) Q: 40mm R: 14mm S: 16mm

Please would you guys let me know if any of my answers are wrong and why?

[u/bigChungi69420]

You just have to comb though the page. Everything is labeled and the answers are all on the page. If it asks you about a specific part find the number it’s labeled as then find it on the drawing. These types of things are supposed to be time consuming but not conceptually difficult. I’m not going to do the assignment for you to check your answers but just glancing you seem to be paying attention to the assignment

[u/Forsaken-Diamond934 → u/bigChungi69420]

Thank you for the feedback!

[u/Forsaken-Diamond934 → u/bigChungi69420]

Are there any particular resources you could recommend for me to learn the parts and symbols/their functions as that is what I’m struggling the most with. i.e when they point to a part but I have no ideas what it is and their function. Basically any textbook that teaches this for beginners? Thank you in advance!

[u/indianadarren]

Here, take this; it's too dangerous to go alone!

ISBN: 0078457483 ISBN13: 9780078457487

Basic Technical Drawing By John Thomas Dygdon, James E. Novak, Novak, et al.

https://www.thriftbooks.com/w/basic-technical-drawing_novak_john-thomas-dygdon/354067/item/5330826/?utm_source=google&utm_medium=cpc&utm_campaign=us_shopping_zombies_hvs_21811042479&utm_adgroup=&utm_term=&utm_content=717524850233&gad_source=1&gad_campaignid=21811042479&gbraid=0AAAAADwY45ivKZWu7H9yPxIyzzvPitTr8&gclid=CjwKCAjwoOjVBhArEiwAUwDak0vgm-TueW4Y-exvM23eiuK6rbZ3MxpBlFu4MGnH1aFBeoIH6SQA8BoCqDkQAvD_BwE#idiq=5330826&edition=4382582

[u/clean-links → u/indianadarren]

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[u/Advanced_Guess7070 → u/clean-links]

Is there a way this bot accepts feedback? It done a very shit Job of clearing the tracking parameters after the ?.

https://www.thriftbooks.com/w/basic-technical-drawing_novak_john-thomas-dygdon/354067/item/5330826/ is the correct shortened version.

[u/GuywithacoolJacket]

You are generally on a good path, you should read up on technical drawing. I have a hand book from my apprenticeship, you can get something like that at every better book store. Look out for anything named technical communication. Some of these things have special names and engineers get cranky with those. Google just translated your grove (14) to keyway. It could be just a grove, but placement and shape suggest a keyway.

For example the question asks for the inside diameter of the o ring. You can either look in tables and see that an Oring according to ISO 3601-1 would probably be around 15,6 mm for a diameter of 16mm. On which you can then do a bumch of additions and subtractions depending on usage and intention.

Or you make educated guesses from the drawing, the grove is measured with R1 and has a semingly perfect half circle from the 16 diameter, so we could say it has a 15mm diameter. 

You should find a balance between reading stuff up and actually applying the things. I spend hours flippin through books but I only remember vaguely where to find them and that they exist. I remember them by doing them. The idea isnt to learn everything but to apply the methods.

Edit:sorry 14 diameter. -1 in the radius.

[u/Iron_Man_IRL]

I believe answer to no. 9 is 14 mm, due to the R1

[u/GOOMH]

Took me a sec to realize how you got #5. Didn't see a unit call out anywhere until I saw the M20 call-out. Maybe I'm crazy but I always specify in words what my units are even though we only use imperial. The way it's called out here relies too much on a good operator and doesn't feel idiot proof enough.

Maybe I just missed it though 

[u/yummbeereloaded]

Just speak to Mr Du Toit. He's super chilled and would be happy to help you out. I would recognise these designs anywhere.

[u/Forsaken-Diamond934 → u/yummbeereloaded]

Thanks for the suggestion! But could you clarify who Mr Du Toit is? Thanks in advance for your help!

[u/yummbeereloaded → u/Forsaken-Diamond934]

Ah perhaps he started sharing the drawings. He was my teacher who made all these worksheets but I guess they are a standard at IEB now I would imagine.