Hi I would like to draw various pumps. Some have volutes and others involutes. I have played with the helix and spiral commands, but not sure what the pitch means. Some are 2d/flat volutes, while others are offset, intake from outlet being at different heights.
Any help would be appreciated!
You can find it in the interactive help. Pitch is the distance between turns. You can specify either pitch from which number of turns is derived, or turns, from which the pitch distance is calculated. Rather simple.
Usually, centrifugal pump volutes are defined as a series of radial cross sections.
The geometry definitions are composed purely of lines and arcs.
Here is what a typical drawing looks like:
The best way to model a volute in Rhino usually is to create a sufficient number of evenly-spaced cross-sections and then loft.
Thank you for that - it is pretty simple… BUT