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General Category => Drilling & Layouts => Topic started by: bluerrpilot on November 17, 2007, 01:12:33 AM

Title: Creating an oval ?
Post by: bluerrpilot on November 17, 2007, 01:12:33 AM
Just wanted to hear other opinions on the subject. How do you drill ovals? With the drill press or manually by hand. With maybe a drill and sanding drum or ……whatever else you may use. If you use the drill press, do you have a formula or a specific way that you do it? Maybe something that isn’t so time consuming. I have always done mine by hand for 2 reasons. One, I don’t have a ton of material to remove for the oval. And two, when there are 5 customers in the shop waiting for balls to be drilled, using the press is very time consuming. I understand people will say they use the press because thats the only way to repeat the results. But for me its about feel. And I can do it manually and get all my thumbs to feel the same
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TEAM HammerHead
2008 USBC Nationals
ABQ, NM
Title: Re: Creating an oval ?
Post by: cmoore3wins on November 17, 2007, 09:33:19 AM
Here is a link to the math of an oval

http://www.innovativebowling.com/images/The_Math_Of_The_Oval_Angle.gif
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MoRich World Order
mWo for life - It's a "HOLE" new game....
I flip out ten pins, you flip them off....
Mos cores = Mo scores....
Title: Re: Creating an oval ?
Post by: bluerrpilot on November 17, 2007, 09:54:23 AM
I was looking more for thoughts on how other drillers create ovals for there customers.
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TEAM HammerHead
2008 USBC Nationals
ABQ, NM
Title: Re: Creating an oval ?
Post by: cmoore3wins on November 17, 2007, 10:07:17 AM
quote:
If you use the drill press, do you have a formula or a specific way that you do it?


You asked for a formula didn't you??
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MoRich World Order
mWo for life - It's a "HOLE" new game....
I flip out ten pins, you flip them off....
Mos cores = Mo scores....
Title: Re: Creating an oval ?
Post by: bluerrpilot on November 17, 2007, 10:48:21 AM
ya, I guess I did ask that too
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TEAM HammerHead
2008 USBC Nationals
ABQ, NM
Title: Re: Creating an oval ?
Post by: Greg T on November 17, 2007, 09:28:28 PM

 I use a rasp and a bevel knife.





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If yer arm don't hurt ya ain't shiftin it right!
 

www.krusinklassics.net

 
Title: Re: Creating an oval ?
Post by: BowlerKidR on November 18, 2007, 04:56:45 AM
I work with Jack Jurek and he has a old Quantum that had pre drilled holes in it, including ovals at certain cut ovals. All i have to do is find the correct oval cut, then take their thumb, mark where on the hole their knuckles are located right as the thumb enters the hole, and i use a protractor to measure the degree off the center line. thats how i do it.
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"Strike for show, spare for dough"
Im A Hammer Head 100%
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Title: Re: Creating an oval ?
Post by: johns811 on November 18, 2007, 05:31:07 AM
I've got a rasp style bit in my hand drill. I mark the angle, remove some material, rasp it smooth, check with caliper until I get with a few 1000ths of inch, Then sand smooth with bevel sander. I can get my thumb pretty much perfect every time using the caliper and taking my time.

It is not speedy though. It takes a little while but it works for me.
Title: Re: Creating an oval ?
Post by: azus on November 18, 2007, 06:29:25 AM
I let my driler drill the thumb hole a little to small, then i work out the oval with some low grit sandpaper, and then smooth the surface with some higher grit paper.
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I like my coffee black, just like my metal.
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Title: Re: Creating an oval ?
Post by: Grayson on November 18, 2007, 07:21:09 AM
quote:
I let my driler drill the thumb hole a little to small, then i work out the oval with some low grit sandpaper, and then smooth the surface with some higher grit paper.
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I like my coffee black, just like my metal.
What would Chuck Norris do?
(\ /)
( . .)
c(')(')
Cute Bunny! copy bunny into sig to help him achieve world domination


I use the other way round... I let my driller drill the hole just right as round hole and fill the space with tape... But I guess that was not asked
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"Have fun and bowl well!" - Grayson
"Some things are made so even idiots won't fail using them.... But I aks what about the genius?" - Grayson

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Title: Re: Creating an oval ?
Post by: agroves on November 19, 2007, 10:53:36 PM
Pilot hole, scrapper, elbow grease.  

Andrew
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FUFU

After 4 consecutive high shots, I told my wife "They aren't saying boo, they're saying MOOOOOOOVE".

Edited on 11/20/2007 11:00 AM
Title: Re: Creating an oval ?
Post by: qstick777 on November 20, 2007, 12:49:11 PM
I drill the hole and then work it out with a rasp.  I have a workout tool, but haven't tried using it.

I always thought that you'd really need to use a mill to get repeatable results if you are going to "drill" the oval.

Since I'm using a standard jig (Rudell?) and older drill press, I don't trust trying to do that with my drill.
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