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polaris754
03-09-2010, 04:23 PM
i read very often about checking the a2a measurement, at what point in a bows life should you expect it to change? i have kind of noticed that my bow seems to be getting a little erattic on accuracy and a little noisier, also during this weekends shoot i had to adjust the pins for the very first time ,now as mentioned there is reference to twisting the cables and the string ,dose one or the other have more preference to change a specific thing? meaning cable twist changes a2a, and string to change draw weight.also can these adjustments be done without useing a press>?

polaris754
03-12-2010, 07:27 PM
dang that guy has too many questions lmao!!!!

DeepRiverBowman
03-12-2010, 08:25 PM
He sure does have a lot of questions, but they boil down to a simple answer - A good ole fashioned tune up. The first thing you should have done when your bow was set up and shooting well is to record all your vital measurements: a2a, BH, tiller, nock point location, peep location, and center-shot adj.

I use one of my arrows as a quick reference. I nock it and draw a line in my sight window along the arrow. I can instantly check my nock point by looking at the arrow when nocked. I mark the arrow with a line for where the peep is relative to the nock point; a line for brace height, and a line for tiller. I also write the arrow length, weight, and FOC on it. I keep this arrow as my #12 arrow and can use it to check all my adjustments instantly w/o a ruler or square. (try not bend this one - it really screws up the measurements :-))

Compare the measurements now to the way it was then and go from there. I don't see where the a2a measurement should ever change unless the string/cables stretch (not likely with FF materials). This may signal broken strands. Or unless you've changed weight.

The string and cables have an inverse relationship. Making the string shorter or the cables longer does the same thing - draw length gets shorter and weight decreases. Making the string longer and/or the cables shorter increases draw length and increases draw weight.

Knowing which way you had to adjust your sights may give you a clue as to what's going on.

mike

copterdoc
03-12-2010, 08:27 PM
Your bow's ATA should never change. If it does, you need a new string and cables.

The cable and string together maintain the ATA. If both increase 1/2", the ATA increases 1/2".

Think of the string and cable length as a ratio. As long as the ratio stays the same, cam timing will stay the same as well. If the ratio changes, the cam timing changes.

Cam timing effects; draw length and draw weight.

More string = more DL and DW.

More cable = less DL and DW.

Spiker
03-13-2010, 07:09 AM
Twisting Cables:
Retards Cam, Increases DL, Increases DW, Decreases ATA, Increases BH.

Untwisting Cables:
Advances Cam, Decreases DL, Decreases DW, Increases ATA, Decreases BH.

Twisting String:
Advances Cam, Decreases DL, Decreases DW, Decreases ATA, Increases BH.

Untwisting String:
Retards Cam, Increases DL, Increases DW, Increases ATA, Decreases BH.

Tightening Limb Bolt:
Advances Cam, Decreases DL, Increases DW, Increases ATA, Decreases BH.

Loosening Limb Bolt:
Retards Cam, Increases DL, Decreases DW, Decreases ATA, Increases BH.

Spiker
03-13-2010, 07:11 AM
Twisting Cables:
Retards Cam, Increases DL, Increases DW, Decreases ATA, Increases BH.

Untwisting Cables:
Advances Cam, Decreases DL, Decreases DW, Increases ATA, Decreases BH.

Twisting String:
Advances Cam, Decreases DL, Decreases DW, Decreases ATA, Increases BH.

Untwisting String:
Retards Cam, Increases DL, Increases DW, Increases ATA, Decreases BH.

Tightening Limb Bolt:
Advances Cam, Decreases DL, Increases DW, Increases ATA, Decreases BH.

Loosening Limb Bolt:
Retards Cam, Increases DL, Decreases DW, Decreases ATA, Increases BH.

Above is for a bow with hybrid/hybrix/binary etc. cams...

polaris754
03-13-2010, 10:06 AM
well that answered that ! great kinna new to martin bows and i am trying to get all i can from my set up thanks again fer the info ps if u ever need ur tranny fixed gimmie a yell

Coop
03-13-2010, 10:42 AM
Twisting Cables:
Retards Cam, Increases DL, Increases DW, Decreases ATA, Increases BH.

Untwisting Cables:
Advances Cam, Decreases DL, Decreases DW, Increases ATA, Decreases BH.

Twisting String:
Advances Cam, Decreases DL, Decreases DW, Decreases ATA, Increases BH.

Untwisting String:
Retards Cam, Increases DL, Increases DW, Increases ATA, Decreases BH.

Tightening Limb Bolt:
Advances Cam, Decreases DL, Increases DW, Increases ATA, Decreases BH.

Loosening Limb Bolt:
Retards Cam, Increases DL, Decreases DW, Decreases ATA, Increases BH.

Does this info. also work for dual cams?

Thanks,
Coop

copterdoc
03-13-2010, 10:59 AM
Does this info. also work for dual cams?

Thanks,
Coop
Advancing or retarding cams affects ALL cam systems the same way.

Loosening or tightening limb bolts does not affect cam timing!

Coop
03-29-2010, 12:00 PM
Twisting Cables:
Retards Cam, Increases DL, Increases DW, Decreases ATA, Increases BH.

Untwisting Cables:
Advances Cam, Decreases DL, Decreases DW, Increases ATA, Decreases BH.

Twisting String:
Advances Cam, Decreases DL, Decreases DW, Decreases ATA, Increases BH.

Untwisting String:
Retards Cam, Increases DL, Increases DW, Increases ATA, Decreases BH.

Tightening Limb Bolt:
Advances Cam, Decreases DL, Increases DW, Increases ATA, Decreases BH.

Loosening Limb Bolt:
Retards Cam, Increases DL, Decreases DW, Decreases ATA, Increases BH.

when you say "retards cams", which way is the cam going, counter clockwise or clockwise?

Coop

Montalaar
03-29-2010, 12:05 PM
It should go CCW.

Coop
03-29-2010, 12:12 PM
I'm a visual kinda guy... an this helps alot.

Thanks Again,
Coop