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Author Topic: black u dot surface  (Read 10210 times)

r534me

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black u dot surface
« on: June 03, 2012, 07:15:22 PM »
does anyone know the grit of this thing?. I hit it with 320 grit to get out the scratches and need to finish it up.

thanks

 

kotm

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Re: black u dot surface
« Reply #16 on: June 14, 2012, 05:46:28 PM »
30 micron is equivalent to P500 FEPA grade or between 320 and 360 grit US/CAMI grade.

correct Sir!
Good Luck & Good Bowling!

Ron Machniak
www.Precisionbowlingproshop.com

charlest

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Re: black u dot surface
« Reply #17 on: June 14, 2012, 08:09:56 PM »
30 micron is equivalent to P500 FEPA grade or between 320 and 360 grit US/CAMI grade.

correct Sir!

How on God's green earth, do you, sir, qualify as  "newbie" on Ballreviews?
You're older than anyone else here in terms of ball knowledge!!
"None are so blind as those who will not see."

r534me

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Re: black u dot surface
« Reply #18 on: June 14, 2012, 08:22:32 PM »
I tried it yesterday for several shots on a freshly oiled 40 foot ths pattern  and it had a some pop on the back end.  It moved faster in the dry than my label drilled blue hammer.  I guess I am not surprised since it's block weighted.  Next, I want to compare it to my freshly drilled axis weight blue hammer(x hole 9 inches from the center of my grip).

kotm

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Re: black u dot surface
« Reply #19 on: June 16, 2012, 08:42:15 PM »
30 micron is equivalent to P500 FEPA grade or between 320 and 360 grit US/CAMI grade.

correct Sir!

How on God's green earth, do you, sir, qualify as  "newbie" on Ballreviews?
You're older than anyone else here in terms of ball knowledge!!

the powers that be deleted my account.

I tried it yesterday for several shots on a freshly oiled 40 foot ths pattern  and it had a some pop on the back end.  It moved faster in the dry than my label drilled blue hammer.  I guess I am not surprised since it's block weighted.  Next, I want to compare it to my freshly drilled axis weight blue hammer(x hole 9 inches from the center of my grip).

the hammer will hook earlier and smoother.  if the udot has too much "pop", just sand it smoother until you dial it in.
Good Luck & Good Bowling!

Ron Machniak
www.Precisionbowlingproshop.com

r534me

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Re: black u dot surface
« Reply #20 on: June 24, 2012, 12:40:48 AM »
I adjusted my u dot to 1k and it seems to go longer and moves a little sharper than my hammers but it is not quite as predictable as the hammers on the 40 foot THS I bowl on.  I found that slight hand position changes keeps the axis weighted hammer in play for a long time. Maybe, when the lanes are drier I can use the u dot more.

nord

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Re: black u dot surface
« Reply #21 on: February 26, 2020, 02:57:32 PM »
I know it has been awhile since this thread was posted to, but I wanted to clarify the facts for future people that might find it in a search.

The Columbia Black U-Dot out of box surface was 320 grit.
I confirmed this both with Columbia directly and with the captain of my Nationals team who used this ball back in the day.

Here is what he said about the Black U-Dot:

"I remember the Black U-Dot fondly... I had many.  They were 320 out of box. It was common back then to wet sand the ball up to about 600 grit. It was also very common to polish on top of that using a Luster King machine to tone them down from the early hook."