Oval holes

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gbabione
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Oval holes

Post by gbabione »

I have a Brunswick 61-100000. How would I go about making oval thumbholes? First, where do I find 6" long end mills? Second, if I mark the oval angle before drilling pilot hole, can I then after drilling pilot hole, rotate ball and just use 1 axis to make cuts? Or will that change the pitch?
Guy Babione

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PAP 5" by 1/4" up
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375 rev rate
18 mph off hand
gbabione
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Re: Oval holes

Post by gbabione »

This is a benchtop press. I am thinking that by rotating the ball, the pitches would change. I use to have use of a Litchco Ovalmatic jig. It's been a long time but I think that's all that does.
Guy Babione

Right Handed
PAP 5" by 1/4" up
65* rotation
11* tilt
375 rev rate
18 mph off hand
MineralitePaul
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Re: Oval holes

Post by MineralitePaul »

You can find the end mills at Innovativebowling.com. I used to drill ovals on an old AMF press back in the 80’s. I had so much radial play in the spindle, that I would take an oak 2x2 (that some old bowler gave me for seating the morse tapper bits) and get it between the press’s column and spindle and push on it, adding more force with each plunge. A caliper would measure between each until the desired oval was attained. It would always be a tad less so all the grooves could be sanded out. It was primitive but it worked
gbabione
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THS Average: 211
Positive Axis Point: 5 x 1/4 up
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Re: Oval holes

Post by gbabione »

All I see there are full sets which I don't need. They are out of stock and would be $940.
Guy Babione

Right Handed
PAP 5" by 1/4" up
65* rotation
11* tilt
375 rev rate
18 mph off hand
gbabione
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Posts: 213
Joined: April 6th, 2010, 2:56 am
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Positive Axis Point: 5 x 1/4 up
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Medium Oil Ball: Phase 2
Light Oil Ball: IQ Emerald
Preferred Company: Storm

Re: Oval holes

Post by gbabione »

Any thoughts on the pitches?
Guy Babione

Right Handed
PAP 5" by 1/4" up
65* rotation
11* tilt
375 rev rate
18 mph off hand
gbabione
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Positive Axis Point: 5 x 1/4 up
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Medium Oil Ball: Phase 2
Light Oil Ball: IQ Emerald
Preferred Company: Storm

Re: Oval holes

Post by gbabione »

I just found this post viewtopic.php?f=7&t=14847. This is exactly the information I was looking for. I am surprised nobody answered my question or pointed me to that post. Since I have an old press, I will mark the centerline and thumb angle, drill the pilot hole, then measure pitches off of the thumb angle line and adjust drill press to match to cut my oval. Now I just need a 6" long milling bit or maybe I just need drill bit sharpened.
Guy Babione

Right Handed
PAP 5" by 1/4" up
65* rotation
11* tilt
375 rev rate
18 mph off hand
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bowl1820
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Re: Oval holes

Post by bowl1820 »

gbabione wrote: March 30th, 2021, 1:04 pm I just found this post viewtopic.php?f=7&t=14847. This is exactly the information I was looking for. I am surprised nobody answered my question or pointed me to that post. Since I have an old press, I will mark the centerline and thumb angle, drill the pilot hole, then measure pitches off of the thumb angle line and adjust drill press to match to cut my oval. Now I just need a 6" long milling bit or maybe I just need drill bit sharpened.
Question How does the thread you linked too:
Does the type of ball/core matter when measuring PAP?
viewtopic.php?f=7&t=14847
answer your question about making a Oval hole thumbholes?

Nothing in that thread appears to have anything to do with drilling ovals. So I can see why no one pointed you to that post.
"REMEMBER, it isn't how much the ball hooks, it's where."
gbabione
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Re: Oval holes

Post by gbabione »

Somehow it inserted the wrong post. I have never been on that post and I copied the link right from the address bar so I don't know how it did that. I'll have to search my history for correct post.
Guy Babione

Right Handed
PAP 5" by 1/4" up
65* rotation
11* tilt
375 rev rate
18 mph off hand
gbabione
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Posts: 213
Joined: April 6th, 2010, 2:56 am
THS Average: 211
Positive Axis Point: 5 x 1/4 up
Speed: 18
Rev Rate: 375
Axis Tilt: 11
Axis Rotation: 65
Heavy Oil Ball: Proton Physix
Medium Oil Ball: Phase 2
Light Oil Ball: IQ Emerald
Preferred Company: Storm

Re: Oval holes

Post by gbabione »

I think this was the correct link. viewtopic.php?f=7&t=7805&p=116046#p116046
Guy Babione

Right Handed
PAP 5" by 1/4" up
65* rotation
11* tilt
375 rev rate
18 mph off hand
Mirby1980
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Re: Oval holes

Post by Mirby1980 »

Does anyone know where to get a set of 6in end mill bits
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Dustin
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Re: Oval holes

Post by Dustin »

Mirby1980 wrote: July 9th, 2021, 7:26 pm Does anyone know where to get a set of 6in end mill bits
Check out Innovative Bowling.
https://innovativebowling.com/10-Piece- ... _p_21.html
* MPH @ aarows
* RPM
AR *
AT *
PAP 3 3/4"
(* rebuilding)

“The good thing about science is that it's true whether or not you believe in it.”
― Neil deGrasse Tyson
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Re: Oval holes

Post by bmens84 »

it amazes me how may proshop operators that have a mill/drill with a cross table cant oval holes. The best drill press jig in my almost 30 years experience has been a vacuum jig. I know so many PSO that bought the ovalmatic or the tri oval and have hated them because it takes so long to fool with. Most PSO dont need to take a bowling ball class, they need to take a machining and fabrication class. They would benefit so much more by that.
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EricHartwell
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Re: Oval holes

Post by EricHartwell »

I had a driller in the past that was a Machinist until he retired then took up as a proshop operator.
He was the greatest in matching your grip, good luck with him fitting you correctly if you didn't have a ball to match.
They need to do Both.
Eric Hartwell

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