MR7 Cam Lean

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This topic contains 5 replies, has 2 contributors, and was last updated by bow-drawn Bow Drawn 1 year, 8 months ago.

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  • April 15, 2013 at 6:26 pm #574148 Back to Top REPORT
    canuck
    canuck

    Joined: 3/10/2010
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    I posted this on another site but I thought I might get more help here. I have been shooting my MR7 for quite some time now. I was out in the backyard shooting and I could see my arrows fishtailing. I took the bow in the garage for a quick shoot through paper and I was getting a tear. I had bullet holes before. I am a lefty and was getting a >- and could not move the rest far enough right to get rid of the tear.
    I then checked for cam lean and the top cam was leaning / and the bottom cam was leaning \
    Timing is spot on.
    I am going over the bow now checking everything but it’s kinda left me stumped.
    Cannot yoke tune.
    This bow was shooting amazing up to yesterday.
    Any helpful ideas/solutions?
    April 16, 2013 at 8:57 am #574220 Back to Top REPORT
    bow-drawn
    Bow Drawn

    Joined: 11/14/2007
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    To get cam lean on a MR7 is rather difficult over night and something had to change in the limbs or cables or cams/shafts. I’m not a tech so it’s interesting to see what happened if it is cam lean. I’d be checking my limbs for any show of a crack that weakened them.

    Did you take a straight edge and lay it up on the cams to see it? Do you have a draw board to see it when you have it at full draw?

    Next things I’d be doing is taking it in to the a warranty dealer to inspect it. If it is something like weaken limbs then it should be under a warranty if you are the original owner.

    April 16, 2013 at 12:52 pm #574253 Back to Top REPORT
    canuck
    canuck

    Joined: 3/10/2010
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    To get cam lean on a MR7 is rather difficult over night and something had to change in the limbs or cables or cams/shafts. I’m not a tech so it’s interesting to see what happened if it is cam lean. I’d be checking my limbs for any show of a crack that weakened them. 

    Did you take a straight edge and lay it up on the cams to see it? Do you have a draw board to see it when you have it at full draw?

    Next things I’d be doing is taking it in to the a warranty dealer to inspect it. If it is something like weaken limbs then it should be under a warranty if you are the original owner.

    I know. That is what is throwing me off and I cannot figure out what has changed.

    I’ve gone over the limbs with cotton balls and cannot find any cracks whatsoever.

    I checked the cam by laying a straight edge along the cams. By the time I get to my dloop there is 3/4″ of space for each cam.

    Going to go over all the cables and roller guard tonight to look for anything unusual. I am going to pull the axles and cams tonight. I am wondering if something has bent or broke although and the bearing/bushings are sealed on Mathews cams I believe so I am not sure what I might see.

    Short of finding anything I am going to have to take it into the shop. My fear is that they say new limbs and limb pockets and I am the second owner…no warranty.

    I will update this thread as more information becomes available.

    April 21, 2013 at 6:05 pm #574867 Back to Top REPORT
    canuck
    canuck

    Joined: 3/10/2010
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    I pressed the bow today and did a complete tear down.
    One thing I noticed is that there was a lot more play limb to limb on the bottom cam.
    I could literally move the cam back and forth on the axle with the c-clips still on.
    Should I replace the bearings or shim them?
    April 22, 2013 at 7:10 pm #575043 Back to Top REPORT
    canuck
    canuck

    Joined: 3/10/2010
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    UPDATE
    Bearings on the cams fine. Axles straight.
    I removed the lower limbs from the pockets and swapped left and right limbs. (The cam with slop)
    After putting the cam and axle back together there was almost zero play.
    Put it back in the press and put all the cables and strings back on.
    Checked spec on everything and it was ok.
    Just put and blade launcher rest on and eye balled centreshot and nocking point.
    BULLET HOLE on the first arrow.
    {#emotions_dlg.mathews_big_smile}
    Dang!! I forgot to order a new set of threads! Gonna have to remove the cams and axles again.
    LOL!
    April 23, 2013 at 9:11 am #575128 Back to Top REPORT
    bow-drawn
    Bow Drawn

    Joined: 11/14/2007
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    {#emotions_dlg.mathews_thumbs_up}

    Thanksfor the update and it sounds like you corrected the tuning problem.
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