Seems I should have done this some time ago but I finally placed the platform in it's final location and used the adjustable feet to lift it off the wheels.
There was a gap above the platform in the front left corner of the frame that was at least a quarter inch. When I leveled the platform all four comers were sitting tight against the frame.
At first I thought that was good but that means the frame has been flexing or stressed for a month or so. Hopefully I got away with that.
You can see that the frame is really only sitting on the very corner of the platform. Also the mounting holes only had air under them. Made the frame a bit too large.
I placed two supports on each corner. So there is now about a foot and a half of wood supporting both sides of the frame at each corner.
This not only added support but because the wood was tight up against the frame I could tighten the lag screws without racking / warping the frame.
Before, during testing I could hear what sounded like the frame racking when bringing the gantry forward. In hindsight it's obvious what was happening. With gaps on the corners and all.
With it leveled and corner braces installed it's pretty smooth now.
Hopefully I can start squaring that gantry soon. Today I think I will get back to wiring so that I can bench test the VFD/Spindle.
Thanks.
Jack.