Hi guys I just got a new Roto Grip Idol as a Christmas present, but I notice that the pin to cg is around 1 inch distance, what is the reason some balls have 3 or 4 inches distance and this came to short. Do you think it will afect being to short ??
Thanks in advance
Pin to cg distance
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- EricHartwell
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- Positive Axis Point: 4-3/4" and 1/2"up
- Speed: 16 off hand
- Rev Rate: 330
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- Medium Oil Ball: EVO pearl, True Motion, Columbia Command, DV8 Intimidator
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Re: Pin to cg distance
Pin in or short Pin to Cg balls used to be very limited in how you could drill them. With the rules today allowing more static weight imbalance allows for more drilling versatility with such balls.
What is the top weight?
What is the top weight?
Eric Hartwell
Right Handed
PAP 4.75" up 1/2"
45* rotation
12* tilt
330 rev rate
16 mph off hand
Right Handed
PAP 4.75" up 1/2"
45* rotation
12* tilt
330 rev rate
16 mph off hand
Re: Pin to cg distance
It's do to manufacturing variance, Basically all the parts used to make a ball have tiny variations in them (densities ,size etc.) and each step in making it has slight variations/errors in them. They all add up and they cause the cg (which the center of gravity is not the actual geometric center of the ball) to move some and you wind up with different pin to cg measurements.poloidrogo wrote: what is the reason some balls have 3 or 4 inches distance and this came to short.
There's a article wrote by Nick Siefers called "MANUFACTURING PROCESS VARIATION: THE SMALLEST of SHIFTS CAN ALTER PIN DISTANCE and TOP WEIGHT" that explains it in detail.
"MANUFACTURING PROCESS VARIATION: THE SMALLEST of SHIFTS CAN ALTER PIN DISTANCE and TOP WEIGHT"
http://www.itbca.bowlingknowledge.info/ ... top-weight
"REMEMBER, it isn't how much the ball hooks, it's where."
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Re: Pin to cg distance
Hi Erick the top weight is 2.55EricHartwell wrote:Pin in or short Pin to Cg balls used to be very limited in how you could drill them. With the rules today allowing more static weight imbalance allows for more drilling versatility with such balls.
What is the top weight?
Thanks
- EricHartwell
- Trusted Source
- Posts: 4082
- Joined: April 5th, 2011, 12:24 am
- Positive Axis Point: 4-3/4" and 1/2"up
- Speed: 16 off hand
- Rev Rate: 330
- Axis Tilt: 12
- Axis Rotation: 45
- Heavy Oil Ball: Radical Tremendous, EVO solid, Hammer Obsession
- Medium Oil Ball: EVO pearl, True Motion, Columbia Command, DV8 Intimidator
- Light Oil Ball: Blue Hammer
- Location: Michigan
Re: Pin to cg distance
With 3 oz of imbalance to work with this will not limit layout choices.poloidrogo wrote:
Hi Erick the top weight is 2.55
Thanks
Eric Hartwell
Right Handed
PAP 4.75" up 1/2"
45* rotation
12* tilt
330 rev rate
16 mph off hand
Right Handed
PAP 4.75" up 1/2"
45* rotation
12* tilt
330 rev rate
16 mph off hand