Sitka Mountain Gear
Bowtech Invasion: Need Help Tuning
Equipment
Contributors to this thread:
Russell 06-Jun-19
badguybuster 06-Jun-19
Russell 06-Jun-19
Russell 07-Jun-19
CCOVEY 07-Jun-19
ELKMAN 07-Jun-19
Russell 07-Jun-19
Russell 07-Jun-19
Russell 07-Jun-19
Russell 07-Jun-19
Russell 07-Jun-19
Russell 07-Jun-19
Russell 07-Jun-19
WapitiBob 07-Jun-19
ELKMAN 09-Jun-19
From: Russell
06-Jun-19
Yesterday I received a new string and cables (from a reputable builder out west) for my 2012 Invasion.

First step is rough set timing. Get the cables between the timing marks.

No matter what I do, can't get them there. Cables are equally off, about .20" from being centered between the dots (toward the string).

I've recorded each step. Started by shortening each cable one complete twist. Very little movement toward dots. Added two more twists. Little better. Ended up adding seven, and the cables are sitting over the dots closest to the string. But, the yokes are all twisted-up.

Also, ATA measurement (on left side) started at spec (a tad past 31") prior to any changes. After seven twists to the cable, ATA was close to 30 7/8".

I really need someone that knows this model bow to offer some pointers.

Thanks in advance.

From: badguybuster
06-Jun-19
measure the cables and see if they match up to old ones

From: Russell
06-Jun-19
Wish I could. Old ones were tossed several months ago.

From: Russell
07-Jun-19
Removed the string and cables. Taking to the local pro-shop to be measured.

From: CCOVEY
07-Jun-19
Ive shot and tuned my own Bowtech for probably the last 10 years. Honestly i dont pay any attention to the timing dots. I get the bow in spec with the cables (or close to spec) make sure im getting poundage when i max the limbs out and tune from there. 7 twists in a cable is a lot, ive never had to put more than a couple in one so they could be long.

From: ELKMAN
07-Jun-19
Have you checked your string length? It's a 2 way deal you know.

From: Russell
07-Jun-19
Checked the string at the shop. Nearly 3/4" too short.

Going to make a pin to scale with 3/8" bolt and add 100 lbs force. Double check and record precise distance (OTO pins).

I have two sets that were made (same person). Looks like a phone call is in order soon.

From: Russell
07-Jun-19

Russell's embedded Photo
Russell's embedded Photo
Russell's embedded Photo
Russell's embedded Photo
Russell's embedded Photo
Russell's embedded Photo
Russell's embedded Photo
Russell's embedded Photo
Here's my homemade setup.

Spec: String: 58 9/32". Actual 5/32 too short. Removed three twists. Spec: Cables: 34 5/16". Actuals: 1) 6/32 too long. 2) 4/32 too long. Adjusted to specs. Had to add many twists.

Reinstalled and cables are over the outside dots.

From: Russell
07-Jun-19

Russell's embedded Photo
Upper Cam
Russell's embedded Photo
Upper Cam

From: Russell
07-Jun-19

Russell's embedded Photo
Lower Cam
Russell's embedded Photo
Lower Cam

From: Russell
07-Jun-19
ATA is spot-on. 31 1/32"

From: Russell
07-Jun-19
So, what's the guidance from here? Thanks

From: Russell
07-Jun-19
Continued to adjusting cam lean. Got both perfect using the Spot Hogg Laser.

Checked timing at full draw. Two twists to lower and one to the upper cable. Both hitting nearly perfect at same time.

Close enough until I shoot-in for 100 shots.

Lesson learned so far: Don't accept the string and cables are to spec upon opening the bag. Trust but verify.

From: WapitiBob
07-Jun-19
I would get a better string builder. They should be dead nuts.

From: ELKMAN
09-Jun-19
Bob has this right ^^^ ___ Send them back immediately and call JBK strings or Catfish customs. With a good builder this would have been an hour set up and done from start to finish.

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