Author Topic: Question for Drillers (Read 3900 times)

kalannar · « **on:** February 08, 2007, 02:19:45 AM »

I was wondering. When a thumb hole and finger holes are drilled into a ball, does a 0 pitch hole travel thru the center of the ball? I am working on a 3D model and need to know this to get eh hole placement correct.

Thanks,
Mike
--------------------
That which does not kill us strengthens us.

So do not meddle in the affairs of Dragons, for you are crunchy and taste good with ketchup!

Member of the F.O.S.

***Super Carbide***
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shelley · « **Reply #1 on:** February 08, 2007, 10:23:54 AM »

Yes. I believe the pitches are quoted as a displacement from the center of the ball. 1/8" of pitch puts the center of the hole 1/8" from the center of the ball if drilled that deep.

SH

Sawuser · « **Reply #2 on:** February 08, 2007, 01:48:29 PM »

quote:
Let's see now, 1" thumb drilled to zero would have a 1/2" forward pitch on gripping edge. Correct??

Are you sure?
--------------------
Righty
Think about it!

It is impossible to govern rightly without God and the Bible. - George Washington

JohnP · « **Reply #3 on:** February 08, 2007, 01:55:20 PM »

Mike -- For any hole drilled at 0 forward/reverse and 0 lateral, the center of the hole will pass through the center of the ball. -- JohnP

JohnP · « **Reply #4 on:** February 08, 2007, 01:56:59 PM »

Yes, he's sure. We've been through this before, it's a matter of how pitch is defined. -- JohnP

kalannar · « **Reply #5 on:** February 08, 2007, 02:02:14 PM »

Thanks John. I guess I will have to change my model a little. I have the leading edge going throught the center at 0 pitch.

When you layout the ball for the finger and thumb, how do you find the center of each hole to get the span right? Say for me, span 4-5/8" middle, 4-13/16" ring. 1-1/4" thumb slug, and 1" finger inserts. Where would the centers be? Do you actually mark the center or go off of the edge of the hole distance? I know I have my model close but it is not quite right yet.

Thanks,
Mike
--------------------
That which does not kill us strengthens us.

So do not meddle in the affairs of Dragons, for you are crunchy and taste good with ketchup!

Member of the F.O.S.

***Super Carbide***
***Tsunami***
***Saturn***

Sawuser · « **Reply #6 on:** February 08, 2007, 02:24:33 PM »

quote:
Yes, he's sure. We've been through this before, it's a matter of how pitch is defined. -- JohnP

Thanks. Could be quite confusing.
--------------------
Righty
Think about it!

It is impossible to govern rightly without God and the Bible. - George Washington

JohnP · « **Reply #7 on:** February 08, 2007, 02:24:54 PM »

quote:
When you layout the ball for the finger and thumb, how do you find the center of each hole to get the span right? Say for me, span 4-5/8" middle, 4-13/16" ring. 1-1/4" thumb slug, and 1" finger inserts. Where would the centers be? Do you actually mark the center or go off of the edge of the hole distance? I know I have my model close but it is not quite right yet.

Spans are measured from edge to edge, not center to center. Most finger inserts are 31/32", although some manufacturers do make the largest sizes in 1", so I'll assume your 1" is correct.

When you start, temporarily forget about the thumb slug. Determine and draw your grip centerline and midline. From the midline up toward the fingers, draw lines parallel to and 1/8" to each side of the centerline (for a 1/4" bridge). Measure down the centerline from the midline half of the span, in your case that would be 2 23/64 (or round off to the accuracy you want to achieve)". Draw a line there perpendicular to the centerline. That is the leading edge of your thumbhole. Now measure from that line up the centerline the distance that is the middle finger span minus the thickness of the grip used for that finger and draw another perpendicular line. That is the leading edge of the middle finger hole and the right side of the bit is lined up with the bridge line. Similarly locate the ring finger hole leading edge. Now, when you get ready to drill the thumb hole, line the edge of the drill bit size of the thumb hole (not the slug hole size) up centered on the centerline and with the leading edge lined up with the thumb hole line. Now, remove that bit and replace it with the bit for the slug and drill the hole with the proper pitches. You can then either remove the ball from the jig to rout the slug down or do it in place, but ultimately you want the thumb hole drilled in the slug at the original location which will be in the middle of the slug. The finger holes are located similarly and drilled to the proper pitches using the 1" bit. Then bevel the holes and glue in the grips and if you've done everything right, your spans will be dead on. -- JohnP

Edit: I made a mistake when I figured the distance to measure down from the midline to get the line for the edge of the thumb, it's corrected now. Thanks to kotm for checking my figuring. -- JohnP

Edited on 2/9/2007 11:39 AM

kalannar · « **Reply #8 on:** February 08, 2007, 02:47:11 PM »

Thank you John. That is a very good description on how to layout the holes for for fingers and thumb. Now I just have to figure out how to duplicate that in a 3D model. It would be easier to measure from centers but I think I have an idea for it. It also helps understand how hard it is to match a span because of lining the drill bit up off of the edge insted of the center.

Thanks,
Mike
--------------------
That which does not kill us strengthens us.

So do not meddle in the affairs of Dragons, for you are crunchy and taste good with ketchup!

Member of the F.O.S.

***Super Carbide***
***Tsunami***
***Saturn***

Greg T · « **Reply #9 on:** February 08, 2007, 03:02:11 PM »

Buy the book.

--------------------
SIG CHANGED BECAUSE OF A COUPLE OF WHINERS: Two lepers were playing hockey.
They had a face off.

shelley · « **Reply #10 on:** February 08, 2007, 03:40:55 PM »

quote:
It would be easier to measure from centers but I think I have an idea for it.

You might be able to get away with that by adding in one radius of each of the thumb and finger holes to each span measurement.

SH

JohnP · « **Reply #11 on:** February 09, 2007, 09:43:09 AM »

Deadbait -- Sorry, wait another 6 months or so and repost it, and I promise I'll let the discussion go for a few days. I'll have to admit that the first time you brought that up you threw me for a loop for a while!!! -- JohnP

JohnP · « **Reply #12 on:** February 10, 2007, 10:04:02 AM »

Deadbait -- Post them, I love to learn new (to me, old to you) stuff. -- JohnP

JohnP · « **Reply #13 on:** February 10, 2007, 10:10:10 AM »

kalannar -- I made a mistake in one of the measurements in my post on how to lay a ball out. I corrected that mistake yeaterday, but wanted to alert you and others so you reread the post and have the correct information. -- JohnP

kalannar · « **Reply #14 on:** February 13, 2007, 09:08:10 AM »

Thanks John. I have reprinted it and will make hte corrections to my model. I placed the holes in my model off of the insert and slug hole so I do need to make some changes to it. Stupid me. I will get it right though and post some picks of the different layouts that I have.

Mike
--------------------
That which does not kill us strengthens us.

So do not meddle in the affairs of Dragons, for you are crunchy and taste good with ketchup!

Member of the F.O.S.

***Super Carbide***
***Tsunami***
***Saturn***

Author Topic: Question for Drillers (Read 3900 times)

kalannar

Question for Drillers

shelley

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Sawuser

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JohnP

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JohnP

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kalannar

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Greg T

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