@ triplus, I see where your headed but I tried both of these and they did nothing while in Sketcher. ActiveSketch.ViewObject.TempoVis.restore() ActiveSketch.ViewObject.TempoVis.restoreCamera() OS: Windows 7 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.16085 (Git) Build type: Re...

@ppemawm, what they said and;
You can adjust the sketch Z offset from the floor with Attachment-Position-Z. Changing properties does not update realtime, you need to set the value and click in another properties field to confirm an input.

Assembly is also where typical constrained motion is done. There are a few different options of Assembly here. Assembly2 and 2A are used by many. If you are going to be a power user, Assembly3 would be the best to learn.

Start a new sketch in each body and create a new body for each tread, you will have total control over each tread that way. Sketch them all on the XY plane and view them from above so you can see how they line up. Highlight each sketch in each body to see them all.

Draw sketches of each tread in the XY plane, then move them upwards to the height you want (z axis change). Each tread can be padded for thickness.The side rails; you will need to describe what you intend to build with, steel, wood, because if they are curved they will be handled differently. You ca...

The face the sketch is attached to isn't available until the thickness is made, and made by "thickness is outwards". I bet OCC makes a first pass looking at sketch attachment and can't find a face to attach the sketch to. If we instead draw the sketch on the inside face of the thick solid ...

You don't see any errors on sketch052? I see "2 missing coincidences found".

Win7, using 18.160

Every once in a while I post this write-up I did when I started. Maybe it will help you.
https://forum.freecadweb.org/viewtopic.php?f=21&t=29179

I tried to watch but I'm thinking I will need a universal translator for that one.

You have issues with your sketch. Sometimes they can be hard to find. Search up validate sketch. If you can't figure it out then post back. I fixed mine and it works great. Here is a clue( see pic). The cutout at 1:00 and 2:00 position have double lines.