Hi,
just a thought...
from what I understand about shapers, their geometry makes that the resistance to the movement is not only along the direction of the cut, but there is also a vertical force due to:
- a torque resulting from to the eccentricity of the tool tip (the resistance point) wrt ram movement (in the down direction)
- the design of the Gingery shaper that connects the ram to the vertical driving bar (the "yoke" ?) via a rigid link, creating some vertical component to the force.
So, this could create a strong pressure (and then friction) on the ram ways, that :
- is dependent on the surface condition of the ways
- increase with the load, and if you don't get enough momentum, it could lead to a sort of interlocking mechanism (more load-> more friction -> more load ->...).
[Also, I suppose that the ways require a generous amount of oil to operate smoothly ?]
So my first suspects would be :
- surface condition of the top and lateral ram slides
- lubrication of the ways / pivots
- too tight "fitting" of the ram on the ways
- eventually a default in geometry (but it's very unlikely, as you probably followed Dave Gingery's design)
Or maybe you are just a bit scared to push the machine, and feel like a father watching his boy riding his bicycle for the first time without the 2 little rear wheels ;-)
My 2 (Euro-)cents...
Pierre.
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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