Tiller and Bow Mechanics
 

I'm hoping to get some information on the effects of tiller settings on cable movement and speed.

Background: I have a Bowtech Extreme VFT w/ a Shakey Hunter rest. The bow was set to ~ 60lbs. Unsure of the tiller, but the bottom limb bolt was about out further than the top. I had a limb bolt replaced and the bow ste to 65lbs. The shop set the bow to even tiller. Prior to the change out I had no problems, however afterwards I have been getting fletching contact. I've tried rotating the vanes, but the vanes just make contact in a different place. My rest is tied to the down cable. I am shooting the same arrows as before.

Any help in trying to understand or fix this problem would be appreciated. I am new to the forum. This will be my first year Bow hunting. I have been shooting since Feb. and have seen lots of progress, but this has put a damper on things.

RE: Tiller and Bow Mechanics
 

Sounds like your string nock isn't set right--too high or too low.

RE: Tiller and Bow Mechanics
 

To start with, your measurement to your bottom limb should never be more than the top limb. It should be even, or maybe slightly more on the top limb. So the tech was right to set the tiller to zero for you. However...

If the tech simply adjusted the tiller to even, then it's likely the nockset moved downward in relation to your rest. You'll need to adjust your nockset and peep sight. Be sure to measure the distance between your nock and peep before moving either one. It'll make resetting the peep a little easier when you know the distance it needs to be from the nock.

Setting your tiller to zero might have even screwed up the timing on your rest, so be sure and check that.

IMO, these are things the tech should have checked and gone over with you before sending you out the door.

RE: Tiller and Bow Mechanics
 

If I looked right then the Extreme is a single cam, right? Single cams usually don't have even tiller measurements as normally taken because the cam and idler are of different sizes and/or orientation. There are two recommended ways to tiller a single cam and both are correct. One is to bottom out the limbs and back them off evenly till reaching desired weight. The other is to stretch a string from one axle to the other and measure to the string from the limb pockets.

And you also may have just found out why a lot of us on these boards do almost all our own work. Because we get it right and can blame noone if it is WR------G. What's that word Arthur?

RE: Tiller and Bow Mechanics
 

I do hope the tech that adjusted the tiller did measure to a string stretched over the axles and not to the bowstring. I've seen some awfully ignorant 'techs' in my time[:-], but most have enough snap to do the job fairly well.;)

RE: Tiller and Bow Mechanics
 

With the big launcher on the SH rest, you shouldn't be contacting it, and you can run the hen vane awful close to the cables and still not make contact. Check the nock point and center shot. If you sight down the string from the rear of the bow, and line it up with the center of the riser, the tip of the arrow should appear to be in line or slightly left of the string. This is a good starting point, but shooting paper will tell you more.

If you still can't figure it out send me a PM, I'm in Monroe and will help you.