I've studied your build quite a bit (nice work BTW) and an aspect that isn't clear to me is how the yoke attaches to the ram at the top and compensates for the changing distance between the lower pivot point and the ram's attachment point, i.e. (the distance at yoke vertical from the lower pivot to the ram attachment is shorter than that same distance when the ram is at either end of its travel). Is there a floating link (like in the Gingery shaper) that attaches the yoke to the ram and changes to compensate for the changing distance or is some other method used?
I understand if there's a language barrier to a reply but Google Translate might be of some help.
If you can't make it precise make it adjustable.
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