Arrow Preparation Systems


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The Professional Arrow Preparation System


Firenock PAPS is proudly designed in Illinois (US Patent# 9046452). A unique take on the ordinary arrow preparation tool, the PAPS acts as both your arrow’s spine index locator as well as your arrow deflection value tool. With PAPS (and some practice), you can easily do all complicated, but important arrow preparation procedures within seconds. 


Why Is Locating An Arrow’s Spine Index Important?

After locating the spine index or what we call the first dynamic bend of your arrow, you can use it as a reference point for your cock feather. By doing so, you can then predict how every one of your arrows will flex during launch because they will all flex in the same direction. With this new knowledge, your shooting accuracy will be enhanced. 

Why Do YOU Need PAPS?

After the release of our ultra high performance arrow series AeroBolt, we at Firenock noticed a need for a unique, quality tool for arrow preparation. This prompted the creation of the APS. While an excellent tool, we found that there was still a need for an even better tool. Specifically, a tool to simplify the tedious tasks of spine indexing, spine measuring, spine matching, etc. For without these arrow preparation procedures, shafts are not reliable foundations to install inserts, nocks, or vanes onto. Nor are they dependable enough to build high precision, high performance arrows from. Via the PAPS however, those essential steps can become effortless and straightforward. It is our belief that using the PAPS will become a significant part of your arrow preparation routine. 

See the installation manual here.

And see the PAPS Operation Procedure Video here.

3 Main Components

The Track

Proudly US made, the PAPS track is a 36 inch long double track system machined in a tripe box system. Made of 7000 series aluminum and finished with type two level three hard-anodizing, it’s safe to say that it is extremely durable. To even further ensure its durability and stability, especially at its long length, the bottom of the track has six 3M stoppers installed. Along both sides there are easy-to-read measuring tapes in both inches and centimeters. Specifically, on one side of the track, full length measurement (0-36” / 0-914mm) is provided while on the other side, it is center to each end measurements (18”-0-18” / 457mm-0-457mm). These two different measuring tapes are purposefully designed to simplify the process of measuring shaft length as well as of locating the middle point of the shaft. To doubly ensure your PAPS and bench is indeed level, at least one 7mm cylinder water level can be installed along the middle of the track. 

The Tower

The PAPS tower the core of the dynamic first bend locator. To provide the perfect perpendicular contact points between this tower and your shaft, there are two custom crowned ball bearings at the base of the tower. Three linear ball bearings make up the top portion. With these bearing, PAPS can apply perfectly vertical pressure to the exact center of the shaft during testing while still minimizing the horizontal pressure that may form during spine readings. 

The Supports

In the present market, most spine locater tools use off-the-shelf ball bearings to support and to rotate the shaft.  However, there are two fundamental problems with their design.

  1. Due to the straight edge of off-the-shelf ball bearings, when a shaft is bent during testing, it is forced to rest on on that straight edge.  This causes agular pressure to form between the two.  This issue worsens as the shaft is pressed harder, soon deeming the ball bearings useless.

  2. The typical hole in the middle of a ball bearing requires a screw to fasten it to a mount and/or jig.  Because screws are not typically designed and built for any particular system, the available tolerance of those screws will not and do not provide a perfect fit for your ball bearings.

Due to above problems, Firenock has custom-made new ball bearings. 

To solve the uneven pressure problem, our new ball bearings have a unique angle variable crown outer edge.  This also decreases overall pinch pressure on the shaft, or, in other words, the shaft can ride smoothly and freely all of the time.  Further, this forces the shaft to stay perpendicular to the center of the custom ball bearings.  To solve the second problem, the one about lack of screw tolerance, our bearings have a pre-built, ready to mount stud center.

    All in all, PAPS comes with two supports which each have two of those custom crowned ball bearings installed. Additionally, there is a machined index line on both sides of our supports to ensure the correct position via the measuring tape. 

PAPS Optional Accessories

With the Vibration Module, your PAPS should be able to find the first dynamic bend of the shaft automatically. 

For some shafts, it is necessary to have some assistance finding the first dynamic bend.  With the help of the Vibration Module, by lowering the initial friction as well as adding energy to the system, we can better locate the most defined “valley.”  To expand, while some shafts may have more than one “valley,” some may have one that you can’t even find.  With the Vibration Module, by amplifying only the “valleys” themselves and minimizing everything else, you can more easily pinpoint the first dynamic bend.

    The Vibration Module’s casing is CNC machined brass.  Inside the metal casing, it has a digital component to control the operation timer and the vibrating frequency of the micro-motor.   To operate the vibration module, you need only to press the red button located on the side the case.  With that one push, a short wave of vibration is added to the system for a timed period. Requires AAA batteries, not included.

For even more precision, we have created the PAPS Aerovane Jig Laser Mounting Module. 

This module is a machined piece of aluminum built to work with the PAPS track perfectly.  With this module and the Aerovane laser (sold separately), you can locate and mark the position of the dynamic first bend without standing up.

The Digital Gauge Module gives you an accurate and reliable spine deflection reading of your shaft. 

  1. Mounting Arm : Made of CNC machined aluminum, it is securely mounted on the tower with two mounting screws equipped with O-ring retainers, while the digital gauge is mounted on the arm itself by a stainless tightening nut.

  2. Digital Gauge : Inserted by the gauge tip through the top of the tower, it can measure the deflection of your arrow easily and reliably. It is equipped with a large, easy-to-read LCD display and the reading can be set/sent to “hold / memory / zero”. Modes include inch (e.g. 0.0005”) / metric (e.g. 0.1mm) / fraction (e.g. 1/64”). The 40mm plunger is made of GR5 titanium for accurate measurement. The meter is powered by long-lasting common 3V CR2032 batteries and it will auto shut off after five minutes of inactive operation.

  3. Zero Reference Support : To provide a reliable zero reference point before measurement, this support is available. Made of CNC machined aluminum, as its name suggests, this support is to be placed beneath a shaft at the tower so it becomes parallel upon its the support rollers, allowing for a true zero referencing.

  4. Brass Weight : The brass weight is machined to provide constant weight to act on your shaft, thus allowing you to measure the deflection (stiffness) of different shafts easily and reliably. With the brass weight installed, the system resembles 1.94lb (880g) of pressure when suspended from the center of a 28 in. (0.71 m) arrow shaft, as is the standard method for such measurements via the American Society for Testing and Materials [ASTM] F203105.