This is what it looks like.
https://youtu.be/D9g8ODL3OLw
The only constraints are main jewel pivot and the cams.
There is no tangency errors anywhere.
Not shown is anti-skate/anti drag force mechanism that is still needed.
All the frictions are simulated along with gravity and with a 0.0009N force vector along the tonearm tube it rotates the arm across the play area in about 140 seconds.
The 2 counterweights are not modelled.
I was looking for software to design the cams but could not find anything so I had to write the function in excel and use that data to model.
The math works out perfectly to 11 decimal points for both cams but as can be seen in the last pic there is some cam slip, but only 0.5 micron for the last quarter of travel. I suspect this might be an rounding error somewhere.
The noise in the plots are from hitting cam constraints.
To manufacture is turning out pricey because it has to be wireEDM cut from the high tolerances.
Won't be built at this time.
https://youtu.be/D9g8ODL3OLw
The only constraints are main jewel pivot and the cams.
There is no tangency errors anywhere.
Not shown is anti-skate/anti drag force mechanism that is still needed.
All the frictions are simulated along with gravity and with a 0.0009N force vector along the tonearm tube it rotates the arm across the play area in about 140 seconds.
The 2 counterweights are not modelled.
I was looking for software to design the cams but could not find anything so I had to write the function in excel and use that data to model.
The math works out perfectly to 11 decimal points for both cams but as can be seen in the last pic there is some cam slip, but only 0.5 micron for the last quarter of travel. I suspect this might be an rounding error somewhere.
The noise in the plots are from hitting cam constraints.
To manufacture is turning out pricey because it has to be wireEDM cut from the high tolerances.
Won't be built at this time.
