Copyright: Copyright© Easton 1998
Citation: Written by G.Cornum and B.Hale


Tuning Information

Welcome to Shaft Selector Plus 2000 Tuning Information

To search for information and move through Tuning, use the buttons along the top of the Help and Technical Information window.

Information on...

Bow Tuning


Paper Tuning

The Paper Tuning arrow test is a good method for all shooting styles and particularly for the release shooter.  The primary objective of Paper Tuning is for initial bow set up- i.e. nock point/arrow rest position and to check for proper arrow spine.

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Go to Paper Tears


Broadhead Tuning Adjustments

Stiff Spine Reaction

Weak Spine Reaction


Paper Tears (tuning)

Use the mouse pointer to click on the type of tear that most closely matches your own.

1	2

3	4

5	6


Broadhead Tuning

In general terms, broadhead tuning is done by first shooting a group of arrows with field points into the target, and then by shooting a group of arrows with broadheads.  The two groups are compared and the appropriate adjustments are made.  CAUTION: Never shoot unfletched shafts with broadheads-flight is extremely erratic and dangerous!

The field points should be as close in weight as possible to the weight of the broadheads.  Because it is first necessary to establish a good group with field points, broadhead tuning can be done only after acceptable tuning has been established with field points.

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Bare Shafts Impact High
Bare Shafts Impact High - To correct, raise the nocking point.


Shoot a Group with Field Tips

Set up a suitable broadhead target at a distance of 20 to 30 yards.  Using a set of field-tipped arrows that have been tuned with your bow, shoot a group of 3 or 4 arrows into the target.  Take care to shoot as good a group as you capable.

Shoot a Group With Broadheads

Using Identical arrows tipped with broadheads, shoot a group of three or four into the target.  Use the same aiming spot that was used for the field points.

The shot group is the key.  If you are content you shot a respectable group based on your ability, then compare the position of the two groups.  Make the adjustments (listed on the next page) to your setup and shoot both groups again.  Keep adjusting and shooting until both groups (field points and broadheads) group in the same area.

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Tear #1
Tear # 1 Usually indicates a weak arrow reaction or bowhand torque.  Possible options are:

a.  Decrease the arrow's point weight.

b.  Decrease the bow 's peak weight.

c.  Check for clearance problems.

d.  Move the arrow rest to the right.

e.  Make sure bowhand is well relaxed.

Note: Reverse for left-handed archers.


Tuning

Choose any of the topics below for specifications.

Paper Tuning

Bare Shaft Tuning

Broadhead Tuning

For in-depth information on bow tuning, consult Easton's Tuning and Maintenance Guide available at your local dealer or call or write Easton, 5040 W. Harold Gatty Dr., Salt Lake City, Utah 84116 801-539-1400 ($2.50 postage and handling).


Bare Shaft Tuning

The concept of "bare shaft" tuning is based on getting arrows with no fletching to group in the same location (or nearly the same) as comparable arrows with fletching.  This is accomplished by shooting several fletch arrows at about 20 yards to establish a group on the target.  Then a group of bare shafts is shot and the locations of the centers of the two groups are compared.

Use the mouse pointer to click on the type of grouping that most closely matches your own.


Tear # 2
Tear # 2 uncommon for right-handed archers shooting a mechanical release, and may indicate a stiff arrow reaction for finger shooters.  Possible options are:

Finger Release

a.  Increase bow weight.

b.  Use heavier point and/or insert combination.

c.  Use a lighter spined arrow.

d.  Decrease cushion plunger tension.

e.  Move the arrow rest slightly toward the bow.

Mechanical Release

a.  Move the arrow rest to the left.

b.  Make sure the arrow has has adequate clearance past the cables.

c.  Make sure the bow hand is relaxed to eliminate torque.

Note: Reverse for left-handed archers.


Tear # 5
Tear # 5 indicates the possibility of multiple factors.

Always adjust the nocking point first (tears #3 & #4).  Sometimes adjusting the nocking point also affects the left/right performance of the arrow.  Continue adjusting until tear #6 is achieved or there is a definite left or right tear and then tune as needed for tears #1 or #2.


Tear # 3
Tear # 3  usually indicates the nocking point is too high or sometimes a timing problem with a compound bow.  Possible options are:

a.  Lower the nocking point until the tear is corrected.

b.  Check the wheel/cam timing of the bow.


Setting up the Paper Test

1) Firmly attach a sheet of paper to a frame type rack approximately 24"x24" (60x60 cm).

2) Position the center of the paper about shoulder height with a target mat about six feet (1.5m) behind the paper to stop the arrows.

3) Stand approximately six feet (1.5m) from the paper.

4) Shoot a fletched arrow through the center of the paper at shoulder height.

5) Observe how the paper is torn.

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Tear # 4
Tear # 4 usually indicates a low nocking point or sometimes a timing problem with a compound bow.  Possible options are:

a.  Raise the nocking point.

b.  Check wheel/cam rollover synchronization.


Stiff Spine Reaction

- Increase bow poundage

- Increase broadhead weight

- Decrease tension in cushion plunger

- Move the arrow rest or cushion plunger in toward the bow.  Make adjustments 1/32" at a time.

Note: Reverse for left-handed archers.


Tear #6
Tear # 6 Indicates acceptable initial bow set up.  Nocking point, arrow spine, and rest position/clearance are adequate for further tuning.

For in-depth information on bow tuning, consult Easton's Tuning and Maintenance Guide available at your local dealer or call or write Easton, 5040 W. Harold Gatty Dr., Salt Lake City, Utah 84116 801-539-1400 ($2.50 postage and handling).


Weak Spine Reaction

- Decrease bow poundage

- Decrease broadhead weight

- Increase tension in cushion plunger

- Move the arrow rest or cushion plunger out away from the bow.  Make adjustments 1/32" at a time.

Note: Reverse for left-handed archers.


Tuning Using the Paper Test

The Paper Test is the method of shooting arrows through a piece of paper suspended 4 to 6 feet in front of the archer.  The resulting tear patterns can be observed and interpretations can be made regarding the arrow's flight.  Improvements to the arrow's flight are made by making adjustments to the bow and/or arrow.

The Paper Tuning Arrow Test is a good basic bow tuning method for all three types of shooting styles--Recurve with finger release, compound with finger release, and compound mechanical release.

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Go to Paper Tears


Bare Shaft Impact Low
Bare Shaft Impact Low - To correct, lower the nocking point.


Bare Shafts Impact Left
Bare Shafts Impact Left (stiff arrow)- To correct, increase peak weight of the bow and/or add additional point weight. Or use a weaker (less stiff) arrow.


Bare Shafts Impact Right
Bare Shafts Impact Right (weak arrow) - To correct, decrease the peak weight of the bow and/or the point weight. Or use a stiffer arrow.