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Author Topic: Ovals  (Read 2907 times)

dR3w

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Ovals
« on: September 22, 2013, 02:47:15 PM »
Hi,

Are there any instructional videos or articles on drilling oval thumbholes out there?

Any information is appreciated.

thanks,

Drew
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MI 2 AZ

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Re: Ovals
« Reply #1 on: September 22, 2013, 04:40:43 PM »
I am not a driller, but I found the following in some earlier topics on this site and it may be of help to you.

http://www.jayhawkbowling.com/Pro_s_Corner/Pro_Shop_Forms/ovalfittingsystem.pdf

http://www.innovativebowling.com/pro%20shop%20info/The_Math_Of_The_Oval_Angle.gif




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Gizmo823

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Re: Ovals
« Reply #2 on: September 22, 2013, 09:46:13 PM »
Yeah, you just need to google it and find a chart somewhere.  I'd try to explain it, but without a video or pictures it's confusing. 
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dR3w

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Re: Ovals
« Reply #3 on: September 22, 2013, 09:58:23 PM »
For a right hander, would you always move down and right?  As if to elongate the hole downward?  Or do you move up and left as well?  Basically with a round hole you are measuring span from the top of the hole.  Is it the same with an oval?
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itsallaboutme

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Re: Ovals
« Reply #4 on: September 23, 2013, 06:55:38 AM »
Yes, still measure cut to cut.  For a basic oval you will make 2 or 3 cuts as you say, down and to the right.  For some odd shaped thumbs or if you are using a different size end mill to make cuts you may also cut the other side of the hole, or even make notches to custom fit a thumb. 
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Gizmo823

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Re: Ovals
« Reply #5 on: September 23, 2013, 08:02:07 AM »
Yeah, this is correct.  If it's a larger thumb and the oval is wider than .090 too, you may have to go up and left for a cut or two, but be aware that does shorten the span slightly.  If at all possible though, go down and right, it keeps all your measurements correct. 

Quote from: itsallaboutme on September 23, 2013, 06:55:38 AM
Yes, still measure cut to cut.  For a basic oval you will make 2 or 3 cuts as you say, down and to the right.  For some odd shaped thumbs or if you are using a different size end mill to make cuts you may also cut the other side of the hole, or even make notches to custom fit a thumb.
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What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
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