sdsliberty
FNG
- Joined
- Oct 16, 2014
- Messages
- 51
TLDR: MBG 1st Axis adjustment is just a misnamed 2nd axis adjustment, and the 2nd axis adjustment just sets the level - not the sight.
I see a LOT of confusion on here about axis adjustments, and a lot of the information on the vendor sites make it a lot worse! Engineer here - overthinking beyond my shooting ability - something that drove me crazy when learning how to set up my new bow. Thought I'd share to dispel companies claiming 1st axis adjustments when they are just adjusting the 2nd axis and then setting the built in level and calling it a second axis adjustment, and help clarify anyone else that is confused!
According to every source I can find the 1st axis is a line left to right, the second axis is a line straight through the center of the sight, and the third axis is vertical. (http://www.lancasterarchery.com/blog/the-three-axes-of-a-bow-sight/)
So - the level must be perpendicular to the axis and horizontal in our case of setting 1st and 2nd axis. To set the first axis the level would be facing front and back, and the second axis the level would be right to left. On the MBG Ascent series (I have the assault) the step to adjust what they call the "first axis" is to hold a level against the site tape post and rotate clockwise facing the front of the site - which is around the 2nd axis! The micro adjust on the assault pushes a little pin inside right or left on the bottom. If this was an actual 1st axis adjustment the screws at the top and bottom of the football would adjust the top and bottom IN AND OUT not left to right.
Then what they consider the actual 2nd axis adjustment is just setting the sight ring to match the rest of the sight that you already setup. It's not actually rotating your housing to be level with your bow, just matching the ring level with your 2nd axis leveled sight (which you got from the "1st axis" adjustment). I have absolutely no idea why this would be adjustable and not factory leveled to the pins.
Any easy way to think about the fact that you are not adjusting two different axis with these two different adjustments (the football and the sight ring) is that:
1. The level is in the same orientation for both adjustments
2. Both adjustments rotate the sight in the same direction.
Here are two examples (as well as what MBG considers "1st axis") that make no sense.
I see a LOT of confusion on here about axis adjustments, and a lot of the information on the vendor sites make it a lot worse! Engineer here - overthinking beyond my shooting ability - something that drove me crazy when learning how to set up my new bow. Thought I'd share to dispel companies claiming 1st axis adjustments when they are just adjusting the 2nd axis and then setting the built in level and calling it a second axis adjustment, and help clarify anyone else that is confused!
According to every source I can find the 1st axis is a line left to right, the second axis is a line straight through the center of the sight, and the third axis is vertical. (http://www.lancasterarchery.com/blog/the-three-axes-of-a-bow-sight/)
So - the level must be perpendicular to the axis and horizontal in our case of setting 1st and 2nd axis. To set the first axis the level would be facing front and back, and the second axis the level would be right to left. On the MBG Ascent series (I have the assault) the step to adjust what they call the "first axis" is to hold a level against the site tape post and rotate clockwise facing the front of the site - which is around the 2nd axis! The micro adjust on the assault pushes a little pin inside right or left on the bottom. If this was an actual 1st axis adjustment the screws at the top and bottom of the football would adjust the top and bottom IN AND OUT not left to right.
Then what they consider the actual 2nd axis adjustment is just setting the sight ring to match the rest of the sight that you already setup. It's not actually rotating your housing to be level with your bow, just matching the ring level with your 2nd axis leveled sight (which you got from the "1st axis" adjustment). I have absolutely no idea why this would be adjustable and not factory leveled to the pins.
Any easy way to think about the fact that you are not adjusting two different axis with these two different adjustments (the football and the sight ring) is that:
1. The level is in the same orientation for both adjustments
2. Both adjustments rotate the sight in the same direction.
Here are two examples (as well as what MBG considers "1st axis") that make no sense.
How to Sight in a Black Gold Adjustable Sight
How to sight in a black gold sight. S&S Archery walks you step by step with tips and tricks to get the most out of sighting in a black gold adjustable sight
blog.sandsarchery.com
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