First video I've made with my new video camera, wanted to do a short one just to try it out.  Took several hours to upload and render, and I'm rather disappointed at the quality of the upload.  Just playing it through the camera's hdmi cable to a tv, it's crystal clear, but youtube's compression must really suck.  The videos I was taking on my iphone look almost as good and take just a couple minutes to upload.  Anyway, it's about how to verify the location of the CG on a bowling ball, and how to find it if it's mismarked.  Just a short simple video, let me know what you think, thanks. 

http://www.youtube.com/watch?v=fObpICb_R8g

Double check on youtube the settings when playing a video. Often times it does something and adjust the video playback to the lowest quality. Ive had it happen mid video before.

When you do it before drilling, the grip center will be where you want to weigh it from, not on the CG.  Doing it before drilling is a good idea because it will give you a good estimate what your post-drilling static weights will be.  This is important for keeping the ball within legal limits if you aren't using a weighthole, and if you are, it will let you know how much weight you will have and where it will be at so if you have to, you can manipulate where the weight ends up with hole depth.  It's also useful because if you use a layout that won't utilize a weighthole, you could find out that you could need a weighthole before you drill it so you can adjust your layout before the fact, rather than having to add one that you don't want or hadn't factored in after drilling.  You will always want to weigh it again after drilling to find out exactly what your weights are before you take any further action also. 

Giz, nice job!

Question for you. Doing before drilling allows you to properly layout the ball correct?Can this also be done "after" the ball has been drilled and if so, what does one learn from it?

Thanks

Appears to me somebody needs to learn the way you find the cg not using the trial and error method.

Yes, the procedure on the Lane 1 site is valid, and no guess work is required.  --  JohnP

Either redo or rename yours "verifying the cg of a bowling ball".

When you do it the proper way you don't need any manufacturer markings to start.

Video has been edited.  I'll make a new video on location. 

Yeah I can check/find a cg pretty quickly, but as far as teaching it or explaining how to find it in a video, the Lane 1 method is the best way to show somebody.  I've just always chased the line in the direction of the weight, just flipping it a few times until I got it right, then I chased the other direction.  I'm sure people have several different ways to do it, but the Lane 1 way is probably the way to teach it if you're going to. 

When I want to verify if a cg mark is correct I put the cg mark at top dead center of the scale using my ProSect, balance it, then spin it to different positions, resetting it to top dead center each time.  If the mark is correct the scale will stay balanced each time.  The problem with this is that it takes almost as much time as using the Lane 1 method.  --  JohnP