Autodesk fusion 360 EXPLODED DRAWING
need to be detailed in the information to make sure that the prototype is somewhat precise with its precisions
dimensions in drawings
usually in mm
not indicated on every dimension but at the bottom of the drawing
the tolerance is +- 0.2 as it defines how much the dimension is allowed to deviate.
the dimension line has an arrowhead on each end
extension lines continue or extend from the surface of the object and establish the size of the dimension and does NOT touch the object line and extends slightly past the dimension line
extension line offset has a gap between the object surface and the extension line, so it is not mistaken with the visible line of the model.
dimensioning
parallel/datum: consists of several dimensions originating from a common reference surface which is also known as the datum.
superimposed running: simplifies parallel dimensions in order to reduce the space used on a drawing.
chain dimensioning: should only be used when the function of the object would not be affected by the accumulation of the tolerances.
combined: uses chain and parallel dimensioning.
small features: arrowheads to be placed outside the extension lines
multiple features: use N x dimension for multiple same dimensions
radius: start with capital R can be with an arrow pointing ot the curve or having the cnetre of the circle amrked with the long short line
circle, arc and holes: circle is dimensioned by its diameter, arc is dimensioned by its radius, holes are located by their centerlines
angles: marked with a curved dimension line and has the degree symbol
rules
should not be duplicated
avoid dimensioning to hidden lines and features
the lines should not cross or overlap
types of fits
importance of tolerance:
parts cannot be manufactured exactly to the dimensions stated in the drawing due to manufacturing variations, tolerance takes this into account.
without it, exact sizes need to be made
the range of tolerance differs due to the different degree of tolerance
different parts form different companies therefor different measurements
it ensures that the product fits well
types of tolerance
bilateral
unilateral
limit
allowed to vary only in one direction
allowed to vary in two directions and need not vary by the same amount
the upper and lower limits f the dimensions are specified
measured by subtracting the upper limit by the lower limit
clearance
interference
when the product can fit together with sufficient space and extra space, easily moved
when the product cant fit together as there is insufficient space difficult to move
joints used in fushion 360
rigid: provides no degrees of freedom; fixes 2 points together
revolute: single rotational degree of freedom; rotates around the standard x/y/z axis
slider: has a single translational degree of freedom; used for components that slides past one another
cylindrical: provides 2 degrees of freedom, one translational and one rotational; when joined using this, they rotate around in the same axis
pinslot: allows 2 degrees of freedom but components can rotate around different axes
planar: allows 3 degrees of freedom, 2 directions of translation in a plane and a single rotational direction to that plane; useful for joining 2 components so they can rotate while sliding across the plane.
how?
under animation
shortcut of j for joints
can just copy and paste the planes
for assembly drawings, got BOM where it includes the part number, material and the quantity of each part