How to lof this

nyholku

I'm trying to model following with loft, it is a feature on an engine oil pan. I'm trying to use the yellow line as the guide, but it won't generate. If I replace that yellow line (which is a line+arc) with a single arc or single line then then loft generates using that as a guide.

So what are the rules here, how should I create the guide line or how should I model this.

shanshan

yes, there is a rule here, now we can not choose any guild  which includes lines and arcs and so on , but when you are drawing the guide, you can use "spline" here,we can choose any spline as guide line

andrew_troup

kustaa_2 said:

I'm trying to model following with loft, it is a feature on an engine oil pan. I'm trying to use the yellow line as the guide, but it won't generate. If I replace that yellow line (which is a line+arc) with a single arc or single line then then loft generates using that as a guide.

So what are the rules here, how should I create the guide line or how should I model this.

@kustaa_2 : actually you can use a string of lines and arcs as a guide curve in Onshape, provided:

1) the endpoints are constrained coincident (it is not enough for them merely to occupy the same location)
2) there are no other entities in the sketch (other than points and construction lines)
3) you must select the sketch from the feature list. The loft will not be created if you choose the entities from the graphics window. In other words, it must show in the "guide curves" list as "Sketch x", not "edges of Sketch x"

nyholku

Thanks! The 3rd rule was golden! Now it lofts beautifully...

3dcad

andrew_troup said:

actually you can use a string of lines and arcs as a guide curve in Onshape, provided:

1) the endpoints are constrained coincident (it is not enough for them merely to occupy the same location)
2) there are no other entities in the sketch (other than points and construction lines)
3) you must select the sketch from the feature list. The loft will not be created if you choose the entities from the graphics window. In other words, it must show in the "guide curves" list as "Sketch x", not "edges of Sketch x"

Tool tip material, thanks @andrew_troup

viru

andrew_troup said:

actually you

can use a string of lines and arcs as a guide curve in Onshape, provided:

1) the endpoints are constrained coincident (it is not enough for them merely to occupy the same location)
2) there are no other entities in the sketch (other than points and construction lines)
3) you must select the sketch from the feature list. The loft will not be created if you choose the entities from the graphics window. In other words, it must show in the "guide curves" list as "Sketch x", not "edges of Sketch x"

@andrew_troup , thank you! for valuable point

shanshan

andrew_troup,I did not notice that we can select the guide lines from feature list, Onshape has updated it!your points about loft are valuable, thanks very much!