design of pulleys and belts

[J ax]

Hello, I looked on the drawing book of machines but found nothing about it: I have to draw the front view of 2 trapezoidal pulleys wrapped by a trapezoidal belt.

My doubts are:

1) Do I need to design the primitive diameter? If so, with a mixed end line?
2) how do I draw the belt?

I looked around but I didn't find anything

 

[MassiVonWeizen]

in the sites of builders, for example clavals, queen... find the manuals of the straps and almost certainly there are also the representations you look for.
I've got the paperwork, a little dated, and I'm here.

 

[J ax]

on queen I found only chains and on clavals I found only the designs of single pulleys in section so no frontal view with ungrained belt

 

[meccanicamg]

you must also draw the primitive for the wheel. if you have to represent 2 wheels and the assembled strap you will design the primitives (-.-.-.-) and the primitive on the belt.

 

[MassiVonWeizen]

on queen I found only chains and on clavals I found only the designs of single pulleys in section so no frontal view with ungrained belt

Save. here.; page 49 figure 4.
it is not necessary to draw also teeth, if you just want to be cool if they make 2/3

You're right about the queen, I'm confused with the poggi.