Hybrid cam bows and top cam advancement, Why ???? >>------------>

ontarget7

WKR
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Apr 5, 2013
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I get asked this quite frequently in regards to tuning so I figured I would share a short reasoning behind it.

Most hybrid cams will require the top cam to hit slightly ahead. This will be more apparent when you get into really fine tuning a setup with creep tuning. The reason behind this is do to the the extra flex on the Control cable as your top cam hits at the same time as the bottom. When you synch so top cam is ahead you are pre loading the control cable and then when the bottom cam hits the buss cable your top cam is more firm with pressure on the control cable. This will give you less variance when pulling through the shot and tighter groups as a whole. With that said, it is a small window and never nothing drastic as far as cam advancement.

When this is done it is not a matter of adjusting for it and calling it good. Your rest will need to be adjusted accordingly to work together to get the best possible vertical nock travel.

Now if you have a drawboard you can take your bow to full draw and lock it in just before the cams hit your cables. Then apply pressure with your finger where the cams will hit the cables on top and bootom. You will notice how much extra flex is in the control cable in comparison to the bottom cam hitting the buss cable.

Hope this helps shed some light as to why it works and the reasons behind it.
 
Is this the case with the new Z5 cams from Hoyt? I heard they shoot the best hitting at the same time.
 
Is this the case with the new Z5 cams from Hoyt? I heard they shoot the best hitting at the same time.

Yes it would.

You can shoot through paper and get equal results but down range the top cam advancement will yield better overall accuracy
 
How much ahead are we talking about? What is "slightly ahead"? I am going with a carbon bow this year and more likely than not it will be a Hoyt, so any clarification you can give is greatly appreciated.
 
How much ahead are we talking about? What is "slightly ahead"? I am going with a carbon bow this year and more likely than not it will be a Hoyt, so any clarification you can give is greatly appreciated.

Great question. Assuming you get the bow dead nuts on for synchronization, how many twists would you add tom advance the top cam? Or do you just creep tune to figure it out?
 
Probably on the order of 1/2 to one full twist on the buss cable extra. To me this is more of a preventive step. Since the buss cable has so much more tension on it than the control cable, as the strings break in the buss cable will creep into perfect sync rather than creep out of sync. Cam & 1/2 bows feel and hold/aim better with the top slightly ahead than slightly behind. They're not very sensitive to creep - meaning the point of impact does not change as much as a 2 cam or single cam bow when an equivalent amount of cable stretch is introduced. You can observe a slight bump in the nock travel if the top is behind and you overdraw the cam until it top draw stop touches, but most likely you would be feeling the back wall get mushy or even a double bump coming to full draw to alert you that you're out of sync. It would probably not aim and hold as well, but I doubt you would see anything too out of whack downrange. Just good advice from OnTarget7 to start with the top hitting a little ahead of the bottom.

DC
 
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