3rd Angle Projection
 

Not necessarily a Bike Issue but not really Idle Banter....

I'm just doing some 3rd angle drawings and it has been so long since I have done it, I have a couple of questions:

What is the correct way to draw a tapped hole?

and

What is the correct way to draw a bolt (I can remember the head - not sure about the thread)?

Thanks
Luke

Re: 3rd Angle Projection
 

google it ............i am sure you will find your answers :wink:

Re: 3rd Angle Projection
 

hmmm, been there done that.....no cigar!

Lot of results of people trying to sell me courses to learn it, but can't find any drawings.

Going back some time I'm afraid, but what I recall is:-

tapped hole, plan view is full circle as minor diameter (hole) with a 7/8ths circle surrounding it to represent the thread (edit - not what's shown in the link, guess they're right, I thought it was the other way round for a tapped hole i.e. the part circle is in the metal side of the detail) . Section is simply parallel lines at core diameter (hole size) and thread outer diameter. Core hole is longer in a blind tapped hole.

Bolt side view is full outline of outer thread diameter, parallel lines at thread minor diameter, transverse line across shaft at the full extent of the thread. A chamfered end is usually shown.

If that makes sense?

like this
http://www.roymech.co.uk/Useful_Tabl...omponents.html

Perfect! - Thank you