Broadhead tuning issue

[SDHNTR]

The Easton tuning guide contradicts itself between the paper tuning and broadhead tuning sections. For a nock left paper tear (which is equivalent to broadheads hitting right of field points), it says move the rest to the right (page 7). But for broadheads hitting right of field points, it says move the rest away from the bow (to the left) for a right-handed shooter (page 11).
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Also, the old weak/stiff arrow advice doesn’t make sense when tuning a modern compound bow shot with a mechanical release. It does make sense for a traditional bow shot with fingers (which is what the Easton guide is geared toward). But modern compound risers are cut way past center (so there’s nothing for the arrow to need to bend around), and a mechanical release eliminates the influence of fingers on the string.

That said, pragmatism is the number one rule in tuning: if moving something one direction doesn’t work, try moving it the opposite direction (regardless of what anyone else says is “correct”).

Thats not a contradiction, those are instructions for two different things. Paper tuning and broadhead tuning.

A mechanical release also removes or almost eliminates the circumstance of being over spined. You can absolutely still be underspined.

 

[bmart2622]

Well this whole post is Exhibit A...the op moved his rest away from the BH group and suprise suprise, it didnt work!!!

 

[Mighty Mouse]

Ok, if you don’t like that source…

I’ve been tuning bows for 20+ years. I’ve never not seen this work unless there is vane contact or a significant form flaw.

My personal experience aligns with what Gold Tip, Tim Gillingham, John Dudley, Aron Snyder, Corey Haas (and others) recommend vis-à-vis rest tuning: broadheads landing right of field points is fixed by moving the rest to the right (and vice versa). But again, do what works for you.

 

[Bump79]

Thats not a contradiction, those are instructions for two different things. Paper tuning and broadhead tuning.

A mechanical release also removes or almost eliminates the circumstance of being over spined. You can absolutely still be underspined.

I've never once had this method work for broadhead tuning. AND it did not work for the OP. Not one time in 10+ years of my bow tuning has the method you described and they did work for me.. I burned so much time learning 10 years ago because of the references you provided telling me to adjust my rest the wrong way. I started making adjustments in accordance with Gold Tip chart @Mighty Mouse shared and bam, every year I'm launching fixed blades well past 80 yards. If my broadheads consistently hit right, I'm moving that rest extremely small increments right at a time. Or shimming/adjusting cams/lean left.

Bareshaft tuning = paper tuning = broadhead tuning require the same adjustments. They all are straightening out the arrow so they all require the same adjustments.

Can you explain why a correcting a paper tear for point left/tail right tear can provide curing a broadhead point right? The broadhead is catching air and getting launched the other way?

Broadhead low = nock point down, rest up.
Broadhead right = rest right, cam left.

 

[Bump79]

@BringBackThe80s tune everyone out for a minute - just reset your bow to centershot. Then shoot broadheads and move like this. Report back when you do and let us know if it worked. I'd put a sizeable amount of money that this is all it is as long as your arrow is making it through without contact.

Broadhead low = nock point down, rest up.
Broadhead right = rest right, cam left.

 

[Mighty Mouse]

Thats not a contradiction, those are instructions for two different things. Paper tuning and broadhead tuning.

If you were able to broadhead tune while simultaneously shooting through paper, what kind of paper tear would you see if the broadheads were landing right of field points? Asked another way, for a broadhead-tipped arrow that is missing field points to the right, which way is the nock end of the arrow pointing as it leaves the bow (nock right or nock left)?

A mechanical release also removes or almost eliminates the circumstance of being over spined. You can absolutely still be underspined.

I agree that being underspined can still cause issues with a compound bow shot with a mechanical release. I just don’t believe that it will consistently manifest as “weak spine = broadheads hitting right of field points” (for a right-handed shooter).

 

[Bump79]

I agree that being underspined can still cause issues with a compound bow shot with a mechanical release. I just don’t believe that it will consistently manifest as “weak spine = broadheads hitting right of field points” (for a right-handed shooter).

My experience with weak spine and mechanical release on a compound was poor broadhead grouping and just erratic flight. No particular direction but I'm sure that could happen.

 

[Mighty Mouse]

My experience with weak spine and mechanical release on a compound was poor broadhead grouping and just erratic flight. No particular direction but I'm sure that could happen.

Same. Erratic grouping/flight is what I would expect. I would agree, however, that there are likely cases where other factors might predispose an underspined arrow to trend in a particular direction.

The weak/stiff tuning advice is unfortunately often given with no explanation of the underlying mechanics and no context given for the type of bow/release or handedness of the shooter.