Brace vs A2A on MR8

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This topic contains 8 replies, has 2 contributors, and was last updated by  cdk 1 year, 3 months ago.

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  • December 18, 2012 at 3:29 pm #497264 Back to Top REPORT

    cdk

    Joined: 1/6/2012
    Need some help here, have an MR8 who’s A2A measures 33 1/4″ and brace height is 8 1/4″. (supposed to be 33″ and 8″)

    Limbs are tight. I know on older styles bows if you shorten the A2A you increase brace. Is this different now with past parallel limb bows, guessing yes?

    Which measurement is more important because I don’t know if I can get both into spec. Any help would be appreciated.

    December 18, 2012 at 3:52 pm #544404 Back to Top REPORT
    l-o-s-t-arrow
    L.O.S.T.Arrow

    Joined: 5/16/2006
    Location: Alberta
    :D :welcome to the :solocam forum…

    Brace height will still increase with ATA being shortened…

    Guide..
    http://forums.mathewsinc.com/archery-4/ … ed-178335/

    However the strings on that bow have stretched considerably…

    I would start over with a spec tune….

    Start with ATA and poundage [Im guessing poundage is way down also]

    Get ATA, poundage and Cam timing as close as possible…use guide above..

    Most times BH will be close and close counts with BH..how did you measure BH?
    :D
    Neil

    December 19, 2012 at 9:55 pm #544405 Back to Top REPORT

    cdk

    Joined: 1/6/2012
    Hey Neil thanks for the help need a little more if you don’t mind.
    Went through and set strings and calbles to spec. A2A is now 33 1/8 and brace is 8″ measuring to inside of string.
    Problem is now my cables are barely in the timing holes. Bow mounted sting up cables are in the very bottom of timing holes. It’s going to take a fair amount of twisting to get them centered and at that point my string cable lengths won’t be in spec or am I missing something. I’ve always felt cam timing / rotation trumps string cable measurements is that right?
    December 19, 2012 at 10:36 pm #544406 Back to Top REPORT
    l-o-s-t-arrow
    L.O.S.T.Arrow

    Joined: 5/16/2006
    Location: Alberta
    :D Are you checking timing on a draw board?
    Arecables high in window when bow is relaxed…you can still twist more to bring ATA in which will also move timing considerably..

    Neil

    December 20, 2012 at 2:52 pm #544407 Back to Top REPORT

    cdk

    Joined: 1/6/2012
    Well I’m close, I think LOL! I’ve got the A2A, brace and cam rotation at rest all dead on. The kicker is I had to twist my string up almost a 1/2″ shorter then spec. Is that normal or ok?

    I have not put it on my draw board yet didn’t feel I was close enough to bother.

    Thanks again for all the help.

    December 20, 2012 at 5:26 pm #544408 Back to Top REPORT
    l-o-s-t-arrow
    L.O.S.T.Arrow

    Joined: 5/16/2006
    Location: Alberta

    Well I’m close, I think LOL! I’ve got the A2A, brace and cam rotation at rest all dead on. The kicker is I had to twist my string up almost a 1/2″ shorter then spec. Is that normal or ok?

    I have not put it on my draw board yet didn’t feel I was close enough to bother.

    Thanks again for all the help.[/quote:1yqnpcmk]

    :D when you say shorter than spec did you actually measure string than twist?

    but it is normal for some strings to stretch that much …seen worse on other brands..

    Neil

    December 21, 2012 at 5:40 pm #544409 Back to Top REPORT

    cdk

    Joined: 1/6/2012
    String is now 62 1/4″ spec is 62 3/4.

    limbs tight the bow is at 75 pounds. It has always maxed out high which I’m fine with.

    I brought it to the local pro shop to check the poundage (my scale took a crap) they said to leave the string short but I typically feel I know more about tuning then they do, so I take there opinion with a a grain of salt. ( I managed 2 different pro shops in the late 90′s early 2000′s.)

    My main concern is that there is something not right 1/2” is allot in my book. Hate to do damage to the bow.

    Oh yeah, and my forearms are sore from cranking limb bolts, I need a new press ](*,)

    December 21, 2012 at 5:52 pm #544410 Back to Top REPORT
    l-o-s-t-arrow
    L.O.S.T.Arrow

    Joined: 5/16/2006
    Location: Alberta
    :D One can over twist cables/strings up to an inch before it knots up on itself…

    from the poundage I will say yours is over twisted, not a bad thing as long as strings dont try to knot up when relaxed…you can take out twists to cable and string until poundage comes down then reset specs…to where your slightly over… EX- 71 lbs but specs on…

    Neil

    December 21, 2012 at 8:15 pm #544411 Back to Top REPORT

    cdk

    Joined: 1/6/2012
    Strings are far from knoting up so I’m good there. I know if I start untwisting cables or the string I will loose my A2A measurement and or cam rotation. Just seems odd to have to have the string so short to pull everything into spec. Is that unusual, is there something else going on?

    I think unless you tell me different I’m going to put it on the draw board tonight and get everything sync’ed up and see how she shoots. What’s your opinion on timeing the MR’s, do you sync them perfectly or top cam a hair advanced?

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