Ross compound bow cam lean?

[The big greasy]

How do you fix a ross target competition compound bow with the top cam leaning left?. There are no cable yokes on it.

 

[Billy Goat]

Shims I assume.

I'm not familiar with them. Look to see if it has multiple shims currently or they are solid on each side.

 

[The big greasy]

Shims I assume.

I'm not familiar with them. Look to see if it has multiple shims currently or they are solid on each side.

I think there are shims, I'm not sure. I've heard bent axle, bearings are gone in the cam, or bent cam itself.

 

[Billy Goat]

I don't think there are shims.

I haven't seen a bow that doesn't have shims either side or the cams. Might not be multiples. Something needs to be there to keep the cam off the limb. Might be able to swap them side to side, otherwise look for replacements that you can use that will add up to what the total of both sides are.

So if say you have 1/4" and 1/4" you have a 1/2" of shims in total. So you will want something like 2 -1/8" shims. Put one with a 1/4 to make 3/8" and an 1/8 on the otherside. Those are big numbers to make it simple. Generally you are talking .015, .025, .035, etc. I'd get hold of some micrometers.

 

[The big greasy]

 

[The big greasy]

 

[Billy Goat]

That looks like a shim to me. Looks like some extra space in there too. Likely one on both sides.

 

[Billy Goat]

If you are concerned about bearings in it don't shoot it. Pressing it and pulling the axle will tell you what you need to know, it will show bent axle or loose bearings in the cam, if that is going on.

I can't tell how much cam lean it has to be certain. Lay a straight edge on the cam towards the nocking point. It's not uncommon to have some lean. That does look excessive tho.

 

[The big greasy]

So from where the arrow lays against the cam to the loop is about 1/2 an inch measuring from loop to the same side as where the arrow follows the cam

 

[Billy Goat]

That's acceptable.


I wouldn't be worried about moving it unless tuning shows that you need to.

 

[The big greasy]

I cannot move my rest either way far enough when bare shaft tuning. It kicks the the arrow nock far right

 

[dkime]

Move this shim from the right side to the left side, your bows gonna have some torque hence the bent cable rod.


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[The big greasy]

Ok I will have to find someone with a press. What caused this to lean so bad. The bottom one is straight, I never dry fired or dropped it.

 

[dkime]

All bows have cam lean, your bow will be even worse at full draw than it is at brace. With the exception of bows with shoot through cable systems, the cables are routed to the RH side for a RH shooter, thus causing the cam to have to lean a little over to the right. At full draw those cables are holding a couple hundred pounds of stored energy. Honestly, don't worry about the lean it doesnt mean anything. Worry about the tune and let the chips fall where they may.

 

[The big greasy]

I'm a right handed shooter and when I hold the bow and look at the top the top cam it's leaning to the left instead of right. I cannot get it to bare shaft tune no matter the rest adjustments

 

[dkime]

I'm a right handed shooter and when I hold the bow and look at the top the top cam it's leaning to the left instead of right. I cannot get it to bare shaft tune no matter the rest adjustments

Set the rest at center shot, stop touching the rest. Move the shim. It should change your shot reaction. This is probably a DL and torque issue more so than anything else.


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[The big greasy]

Set the rest at center shot, stop touching the rest. Move the shim. It should change your shot reaction. This is probably a DL and torque issue more so than anything else.


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So just move the top cam shims, and do not touch the bottom cam at all right?

 

[dkime]

So just move the top cam shims, and do not touch the bottom cam at all right?

One variable at a time my friend, start there and we will see what happens.

 

[Billy Goat]

Move top, but I'd still want some sort of shim there.

Your going to need to find some thin shims.

 

[The big greasy]

Thanks for everyone's input, the axle was perfect as were the limbs. It just needed shimmed. There is still some lean but that's because of the cable rod.