tuning issues

drhoyt · 08-07-2007, 07:42 PM

i have a 2005 hoyt ultramag. about three months ago i put gibblet strings on it and had it shooting bullet holes. today i put some prong covers on and planned and having to adjust the hieght but had a 1" to 2" tear sideways. i got to looking at it and the string comes of the cams to the left, at full draw and when it is sitting. i also checked the ata and it is a 1/4" to long, but was fine when i put it on.

thanks for any help.

drhoyt

nodog · 08-08-2007, 09:23 AM

Quote:

ORIGINAL: drhoyt

i have a 2005 hoyt ultramag. about three months ago i put gibblet strings on it and had it shooting bullet holes. today i put some prong covers on and planned and having to adjust the hieght but had a 1" to 2" tear sideways. i got to looking at it and the string comes of the cams to the left, at full draw and when it is sitting. i also checked the ata and it is a 1/4" to long, but was fine when i put it on.

thanks for any help.

drhoyt

Changing things effects thing. Those covers aren't perfectly shaped and the way they fit the prongs isn't perfect either.

As far as the strings, things settle. I don't know what you mean about coming off left? Hoyts are not centered, cams that is. One cam is farther to the left than the other. It's supposed to be that way. Gibblets strings are very good at staying put, but some adjustments need to be made. A good tech has said that inorder to set strings right you should use the cables to set the ata to a 1/4 long and then adjust the string. I'd use the cables to bring it into line if you need to. Mine shoots best a little long. The way the bow draws and settles is different in relation to where they cross the timing holes (cam 1/2 cams) I like mine past center. Before center the roll over is to abrubt for me. (they say anywhere is fine).

What are you looking to achieve? Having equipment that measures results is great to have. If you have a crono and it reads the same at a 1/4 long, the bow shoots well and all you have to do is work on form, there's really no benifit to shortening it a 1/4.

Really doesn't change much, maybe 2-3 fps if that.

I look for the way it pulls and settles, sound, accuracy and as much speed as it can muster.Targets is how I judge accuracy, not paper. Tears don't tell why it's doing what it's doing. Unless you know the reason (often the shooter) you'll tear your hair out tyring to figure it out.

Based on your post I'd say you are not that experienced (no insult intended)Shooting form has a great deal to do with bullet holes. Good form takes a long time to achieve and understand.

drhoyt · 08-08-2007, 10:51 AM

thanks for the replie

i am not really concerned about the ata, but on the bottom cam it looks like the string is coming off of it to the left, and the top cam is tilted to the left. is there an easy way to adjust this?

thanks for any help

drhoyt

KodiakArcher · 08-08-2007, 02:03 PM

Not all that experienced with cam 1/2 but isn't the yoke on the top limb? If so you can twist one side of the yoke up to correct the lean. The trick is you want it to be corrected to the 1/2 way point between the lean at rest (static) and the lean at full draw. I'm sure someone will 'fix' my thinking if I'm wrong.

TradTech · 08-09-2007, 11:30 PM

Follow the instructions on this link for proper sync and time of a hybrid c&1/2.
http://www.archerytalk.com/vb/showthread.php?t=207391

As far as cam lean, you can adjust the yoke on the upper limb by twisting one side of the yoke. If it leans left, twist the right side of the yoke on a RH bow and conversely twist the left side on a LH bow as it will lean to the right.

If you have a floating yoke, serve above the "V" on both sides about 1-1/2" from the bottom of the "V".