What is the difference between single cam and dual cam?

A single-cam bow has one power cam and a round idler wheel, so there is no second cam to keep in time. A dual-cam bow has two matching cams that have to stay in time with each other, and hybrid and binary systems link two cams through the cables in different ways.

Can I change my draw length with the cam?

On many compound bows, yes. Draw length is usually set by rotating a module on the cam or by fitting a different module, within a range the maker lists for that bow. Some bows need a different cam altogether. Follow the maker's chart and re-check the tune afterwards.

What does the draw stop on a cam do?

It ends the draw at a fixed point, giving a solid back wall to pull against at full draw. Moving it changes how firm the wall feels and, on some cams, the let-off. Small changes can affect timing and tune, so make them one at a time.

Cam

A cam is the shaped, off-centre wheel at the end of a compound bow's limb. As you draw, it changes the bow's leverage, so the draw weight rises to a peak and then drops off before full draw. That drop is the let-off, and the cam's shape sets both the draw force curve and how much holding weight is left.

Details

World Archery's target rules define a compound as a bow where the draw is mechanically varied by a system of pulleys or cams, and that is exactly what the cam does. Its profile decides how quickly the weight builds, how long it stays near peak, and how deep the valley is at full draw. At the same peak weight and draw length, a more aggressive cam tends to store more energy and shoot faster, while a smoother one is easier to draw and many archers find it more forgiving.

Compound bows use several cam systems. A single-cam bow has one power cam paired with a round idler wheel. Dual-cam bows have two matching cams, and hybrid and binary systems use two cams linked through the cables in different ways. On most systems with two cams, the cams have to stay in time with each other, which is what cam timing checks.

Many cams set draw length with a rotating module or a module you swap, and some also adjust let-off. A draw stop on the cam ends the draw at a solid back wall, and its position changes how the back wall feels. Change these only within the maker's chart for your bow.

Because the cams sit on the limb tips and carry the string and cables, a cam that leans, a worn axle or a string that does not track in the groove all show up in the tune. Servicing the cams, strings or cables means relaxing the limbs in a bow press.

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What is the difference between single cam and dual cam?: A single-cam bow has one power cam and a round idler wheel, so there is no second cam to keep in time. A dual-cam bow has two matching cams that have to stay in time with each other, and hybrid and binary systems link two cams through the cables in different ways.
Can I change my draw length with the cam?: On many compound bows, yes. Draw length is usually set by rotating a module on the cam or by fitting a different module, within a range the maker lists for that bow. Some bows need a different cam altogether. Follow the maker's chart and re-check the tune afterwards.
What does the draw stop on a cam do?: It ends the draw at a fixed point, giving a solid back wall to pull against at full draw. Moving it changes how firm the wall feels and, on some cams, the let-off. Small changes can affect timing and tune, so make them one at a time.