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Let's try to get back on track ... the question is how to determine a
to install a peep when setting up the bow in a press ... this is just a STARTING POINT, and is
not the final peep position
. All the advise about pulling back to full draw and opening the eyes applies to locating the final peep position and is of no help when setting up a new string in the press unless you already know the approximate peep location from prior experience...in fact, if the initial peep position isn't fairly close to correct, either the shooter ends up all contorted to see clearly through the peep, or a lot of unnecessary work is needed to get it right.
For those who just want to know
: For short ATA bows 32" and less, place the initial peep location 6.25" above the nock point if the head is held upright at full draw or place the initial peep height at 5-3/8" above the nock point if the head is leaned into the string to touch the nose.
For those who want to know why
: (Geek Warning ...
) Why is it important to have an approximate peep position and only temporarily tying-in the peep? When installing the peep for the first time, the bowstring will have to be balanced so that the peep comes back without rotating. If the peep has to be moved very far from the initial installation point it will twist out of alignment when locating the final position, then the bow will have to go back in the press and have the string re-twisted to get the peep to align again, then the string upper and lower tensions rebalanced so the peep comes back without rotating, and possibly the specs will have to be checked/reset. A lot of work can be saved if the peep is initially mounted near the final position. First, the string tag in a new string is only used to get the string properly installed right side up and to separate the strand bundles, usually of different colors, it is not a proposed peep height, so ignore it for peep position. How the sight is mounted has nothing to do with proper peep height, find the proper peep height then gang adjust the sight to zero for the first pin. If the sight gang adjustment runs out of range, then likely the sight is mounted incorrectly...fix the sight, not the peep height. Second, after getting the new string-cable adjusted so the bow is in spec, set the nock height 1/8" above perpendicular with the launcher in full up position and arrow supported on centerline of berger hole (TIP: set the specs 1/16" to 3/32" short on ATA shelf-side and slightly over rotate the cam timing to account for initial string settling/stretch will save a lot of work). Only after the approximate nock point is installed can the approximate peep position be located and the peep temporarily installed so that it can be slide up and down the string. (TIP: Smooth peep's string slots with fine emery to prevent cutting strands and temporarily tie-in peep with dental floss only around string and peep). Just to keep it simple, this is what I do when setting up a bow with a new string for someone: 1. Make sure the correct angled peep is being used. 35/37º angled peep for short ATA bows, 45º angled peep for long ATA bows. Using the correct angled peep places the face of the peep more square to the eye at full draw. This is important for having a clear/sharp image. 2. Have the person show me how they anchor and where the nock would be located (approximately) on the face. If the nock falls between the corner of the mouth and jaw (normal), I use 3.75" parallax height unless they have an unusually short or long face, then I measure. 3. If the person holds their head upright (normal with kisser buttons or long ATA bows) I use the peep angle. If the person bends the head into the string to touch the nose, I add 10º to the peep angle. 4. I then compute the peep location. Remember, this is to just to locate a STARTING POINT, so measuring everything to a decimal place isn't going to help.
: if the head is upright. Divide the parallax height by .6, which is the Sine of 35/37º
3.75" ÷ Sin(37º) = 3.75"/.6 = 6.25" above nock point
: If the head leans into the string to touch the nose. Divide the parallax height by .7, which is the Sine of 45/47º:
3.75" ÷ Sin (37º+10º) - 3.75/.7 = 5-3/8"
Now the bow is ready to be 'shot in' and tuned for nock height. If the specs have been set a bit short on ATA and slightly over rotated on cam timing, everything should be dead-on specs after about 25 shots with a quality string. Tune for bullet hole in paper at 5' and 10'. Now the peep is ready to have final location determined. Draw bow level with eyes closed to anchor. Hold for a bit to settle in, then open eyes. Don't move head or move bow hand to bring sight onto target, adjust peep height to align peep with eye, if the original peep position was close, moving the peep less than ±¼" should be all that is needed. If the peep rotates, have someone twist the peep to align it square while at full draw. Once satisfied, place the bow back in the press. Adjust string twists/tensions to get the peep to come back straight, no rotation. One-half twist of the lower end of the string will rotate the peep about 22.5º. While in the press, back off to tension the string and check peep alignment, then slightly relax string and observe peep motion ... it shouldn't rotate when tension is removed. Once you are satisfied, then tie-in the peep. There are many methods. I prefer the Jim Fletcher method. It provides a fairly secure peep location, while allowing the peep to be readjusted if needed (string creep/retuning), and by moving the upper and lower knots closer or farther away will correct to keep the peep square to the eye.
Now that the bow is in spec, tuned, and peep tied-in, zero the sight for the first pin/mark. ... hope this helps.
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