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Author Topic: Finger pitches on grip sheet Question?  (Read 2870 times)

Aloarjr810

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Finger pitches on grip sheet Question?
« on: March 17, 2007, 10:45:24 AM »
I'm looking at a print out of my grip sheet at the finger pitches.
I know my fingers angle in toward the bridge alittle.

This is what it say's on the sheet-

 <1/4 (mid-fing hole)bridge(ring-fing hole) 1/8>

Now when I look this the < or > make me think the pitches go away
from the bridge. But I know they don't.
how do you read it? Or how do others label the pitches?

And I know that can't be a 1/4" and a 1/8" or the
bottom of the holes would meet.
Or is that a1/4 of a degree and a 1/8 of a degree?
I didnt get a chance to ask my driller about it.



Edited on 3/17/2007 6:48 PM
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proshopbowl

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Re: Finger pitches on grip sheet Question?
« Reply #1 on: March 17, 2007, 07:04:58 PM »
You have to get to 1" difference in lateral pitchs, for them to never meet. Your current pitches would come together fairly quickly, probably somewhere near 1.5" deep.
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Aloarjr810

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Re: Finger pitches on grip sheet Question?
« Reply #2 on: March 17, 2007, 07:21:33 PM »
Wow there was a post now its gone! I think it said it was from WhackBowler.

Thanks Proshopbowl yours and the other I think cleared it up for me.

I didnt think of the holes angling in to the center. i thought  0 pitch
meant the holes were parallel to begin with.
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JohnP

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Re: Finger pitches on grip sheet Question?
« Reply #3 on: March 17, 2007, 07:37:22 PM »
Pitches are measured at the center of the hole, and are the distance the center of the hole misses the center of the ball.  For simplicity, let's talk about a 1" hole with 0 pitch.  The center of the hole is toward the dead center of the ball.  But either side of the hole would pass 1/2" to that side of the center of the ball.  That's why for a MF hole (rightie) with left pitch the right side of the hole will usually be angled toward the bridge instead of away from it.  The hole would have to be drilled with 1/2 left pitch to be parallel with the bridge.  It will help you to understand this if you draw a circle, representing a ball, then draw the holes in from a side view.  Most drillers stay with at least 3/4 difference between the pitches of the two finger holes.  Thanks to Deadbait for helping me to understand this, even if he was trying to confuse me (lol).  --  JohnP

hskrntx

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Re: Finger pitches on grip sheet Question?
« Reply #4 on: March 18, 2007, 09:13:00 AM »
When determining how deep the holes will be before they meet you not only need to know the pitches, you also need to know the width of the bridge!
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JohnP

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Re: Finger pitches on grip sheet Question?
« Reply #5 on: March 18, 2007, 03:59:36 PM »
Interesting problem, I'll work on it when I have a little more time.  I assume you mean 23/32 instead of 23/22, and for ease of figuring I'll round that off and make both holes 11/16.  --  JohnP

JohnP

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Re: Finger pitches on grip sheet Question?
« Reply #6 on: March 19, 2007, 03:04:18 PM »
OK, the problem as I figured it -- 1/4" bridge, both holes 11/16", 1/8 L pitch for MF and 3/8 R pitch for RF.  These holes would not come together before the drill bit reached the center of the ball (actually, at about 5 1/4" deep).  

I use 1/4 L and 5/8 R with a 1/4" bridge.  For 31/32" holes (for grips), the holes would come together when the straight side of the holes was 3.27" deep.    

The difference is the diameter of the holes.  Larger holes require more pitch differential to avoid them coming together.  --  JohnP

JohnP

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Re: Finger pitches on grip sheet Question?
« Reply #7 on: March 20, 2007, 10:12:53 PM »
Deadbait -- Give me the hole sizes, bridge width, and lateral pitches measured from the standard common centerline and I'll compute.  --  JohnP

kmanestor22

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Re: Finger pitches on grip sheet Question?
« Reply #8 on: March 21, 2007, 02:05:14 PM »
We use 1/8"L and 1/2"R with grips (a depth of 1-3/4") and as long as the bridge is 1/4" wide or greater, they do not meet.  Jayhawk recommends 3/8"L and 3/8"R I believe.
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JohnP

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Re: Finger pitches on grip sheet Question?
« Reply #9 on: March 21, 2007, 05:52:50 PM »
kmanestor22 -- For your pitches, the holes will come together at 3.1" deep.  

I made a mistake when I figured the "come together" depth of the pitch combination I use.  For 1/4 L and 5/8 R, the holes won't come together until past the center of the ball.  --  JohnP