Where Did I Go Wrong

[bjaegers]

I have a 2010 Hoyt Maxxis 31- 29.5 draw length with 70lb limb cranked down. I started to notice a drop off in my consistency this last season my groups were really not that good starting around 60 yards. Unfortunately my personal schedule didn't allow me to get to my closest bow shop in Reno about a 3 hour drive. About a month ago I found this forum and joined after researching my new pack- I started at the very first thread in "Archery" and read everyone that interested me. I put an order in for some Archery Tackle- bow press, squares, levels, etc.

So last weekend I got around to tuning. Measured My ATA 31 5/8 supposed to be 31 1/4. I pressed my bow took off the cables and string and hung them with 50lbs to stretch them. They all measured long about 1/2 inch each, these are winners choice strings with 2 seasons on them. I didn't keep an accurate count of how many twists I added but about 5-10 each until everything measured to Hoyt Tune chart- String 54, Control Cable 35.5, Buss Cable 33.25. I measured from the very top of each loop- they were strung with a very small carabiner. I restrung the bow and measured ATA at 31.5 not what I was looking for- it get's worse. I draw the bow back and you can see in the top picture that my upper cam stop is about an inch from my control cable- how's that for synchronization.




I'm planning on ordering a new set of strings but would like to get these tuned for a backup and could obviously gain some experience by going through the process. I very much appreciate your help in getting me back in the game.

 

[ChanceH]

Check peak draw weight. Make sure it is right at or just a little over. Being that far off on ATA it probably isn't right. Cables need to be twisted. give the bottom cable several more twist than the top to advance that cam a little more. I have never tuned a Hoyt, and only have alot of time working on bowtech overdrive binaries, but that should start you in the right direction.

 

[SHTF]

Is that your string stop hitting the string in the second Picture?

 

[bjaegers]

The second pic down is my bottom cam string stop- it's hitting the Buss Cable.

 

[OR Archer]

Did you measure from the center of each axle when you first took measurements?

 

[Tilzbow]

Looks to me like you need to add about 8 full twists to your control cable. This should get the timing closer and shorten up ATA. If ATA is too short at that point but timing is on take 2 twist out of the control cable and 2 out of the buss.

 

[OR Archer]

Adding twists to the control would make the timing worse. If anything taking 3 turns out of the control and adding 3 to the buss would get it closer.

 

[bjaegers]

Did you measure from the center of each axle when you first took measurements?

Yes measured middle of axle pins. I have some time in the morning to press, will let you know how it goes. Thanks for getting me going.
BJ

 

[RosinBag]

A 1/4" off on ATA's with A Hoyt is not far off at all. You just need to twist and untwist the appropriate cables and check peak weight. ATA's vary slightly from bow to bow anyway. You could take 10 of the same bows off the rack and get several different ATA's. If cams get times and peak weight is a pound or two above max you are right on the mark.

 

[jmez]

Also need to check you brace height and draw weight. Your ATA measurements wouldn't bother me. Factory specs are approximate not exact. If your brace and draw are close then I would just put about 3 twists in the bus cable and see where that puts you.

 

[bjaegers]

A 1/4" off on ATA's with A Hoyt is not far off at all. You just need to twist and untwist the appropriate cables and check peak weight. ATA's vary slightly from bow to bow anyway. You could take 10 of the same bows off the rack and get several different ATA's. If cams get times and peak weight is a pound or two above max you are right on the mark.

So after chasing my ATA I got closer at 31 7/16 and my synchronization seems close. However the V in my yoke seems to small, likely added to many twists to my buss cable. I'm missing an important tool- bow scale. Will get one ordered today so I can stop chasing ATA. Hopefully find that sweet spot of synchronized cams and peak weight 70-72lbs.

Also after thinking about it these strings have three seasons on them. Is it possible that they stretched to far to get them ever tuned properly. I was hoping too get this bow shooting good then try and decide if I want to get a new bow.

 

[RosinBag]

Factory strings probably not going to enough to be untuneable. On your yoke make sure the leggs of each one are not twisted around the other. If they are just keep the amount of twist but move them around each other to separate.

 

[jmez]

You can remove some twists in the buss cable and put an equal number into control cable. I wouldn't worry about the v much either. My element came from the factory with a twist in the bottom of the v.

 

[Brandon Pattison]

Yeah but...

He unstrung them and got the lengths correct. Maybe he had a bunk tune chart info or he has mismatched cam or modules or something going on with his limb pockets. Bad riser? Wrong hole for bottom draw stop? You pros should know. I'm just a bystander.

 

[OR Archer]

Yeah but...

He unstrung them and got the lengths correct. Maybe he had a bunk tune chart info or he has mismatched cam or modules or something going on with his limb pockets. Bad riser? Wrong hole for bottom draw stop? You pros should know. I'm just a bystander.

The mods are all correct and his tune specs are correct as well. Sometimes it just takes a few twists here and there to get things correct is all.

 

[bjaegers]

The mods are all correct and his tune specs are correct as well. Sometimes it just takes a few twists here and there to get things correct is all.

So in the end I could get the synchronization adjusted. But I had to twist the Buss Cable to much and didn't like what was happening to the yoke. I will be ordering new set of strings and a bow scale to complete my tune. Thanks everyone for getting me pointed in the right direction.