I am inspired by Patandjliand and Ali but want to incorporate some ideas of my own. I started with the cams. I have an old lathe and mil but neither cuts shapes well that are not either round or straight. Strait lines on the mill are easy but cam shapes, not so much. So I redesigned the cams to use round shapes except for cut outs that are just to lighten the cam. I don't know if they will yield the kind of draw force curve I am looking for yet, I need to build limbs and make strings, but here is what I have so far:
Instead of one elongated power cam I am using a 2 piece cam consisting of one eccentric round main cam and a smaller offset "button" to give similar geometry to the single cam. This allowed me to machine the cam parts on the lathe,
The main or string cam is actually a perfect circle around the axle except for the cut out notch for the string attachment.
More to come. ..