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Author Topic: black u dot surface  (Read 14008 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
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StrapperJohnMD

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Re: black u dot surface
« Reply #1 on: June 03, 2012, 08:46:03 PM »
I remember looking this up a few years back, and I'm pretty sure it was 1000.
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tommyboy74

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Re: black u dot surface
« Reply #2 on: June 03, 2012, 09:10:37 PM »
I looked it up a few minutes ago and the majority of people that have reviewed it used 1000 as the finish. 
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charlest

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Re: black u dot surface
« Reply #3 on: June 03, 2012, 09:30:00 PM »
Darn, I was watching this thread because I don't remember. Would have thought it was that old Columbia standby 600 grit US/CAMI (the green Scotch-Brite pad).
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Urethane Game

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Re: black u dot surface
« Reply #4 on: June 03, 2012, 10:04:25 PM »
600.  Quite dull out of box.
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r534me

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Re: black u dot surface
« Reply #5 on: June 03, 2012, 11:25:24 PM »
600 is pretty dull.  I don't think I have any green pads.  I can hit it with a 500 ab pad and use a gray pad to bring it to 800 to see what it does?  Basically, I need it a step or two below my blue hammer which is around 500.  I tried the blue at 800 and it works better on the fresh 40 feet ths at 500 but not so good when there is a little burn.
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Aloarjr810

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Re: black u dot surface
« Reply #6 on: June 04, 2012, 07:16:35 AM »
Quote from: charlest on June 03, 2012, 09:30:00 PM
Darn, I was watching this thread because I don't remember. Would have thought it was that old Columbia standby 600 grit US/CAMI (the green Scotch-Brite pad).

I believe your closer to being right at 600 grit charlest for the O.O.B.

The Black U-Dot came out back in the late 80's with a Matte surface (matte or sanded was all they called it), which I think was about a 600 grit wet sand did with a cross hatch pattern at the time.
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Aloarjr810

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Re: black u dot surface
« Reply #7 on: June 04, 2012, 07:21:33 AM »
Quote from: Urethane Game on June 03, 2012, 10:04:25 PM
600.  Quite dull out of box.

Back when that ball came out 600 wasnt considered that dull, not when you had balls at coarser grits than that out.
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charlest

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Re: black u dot surface
« Reply #8 on: June 04, 2012, 07:37:37 AM »
Quote from: Urethane Game on June 03, 2012, 10:04:25 PM
600.  Quite dull out of box.

Remember that's 600 grit US/CAMI grading system (old fashioned, black, wet/dry sandpaper) which, in terms of our current sanding reference, Abralon pads, is equivalent to P1200 grit (FEPA grading system). That is not really dull, when balls like the Lane#1 Agent Orange come P500 grit.
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Urethane Game

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Re: black u dot surface
« Reply #9 on: June 04, 2012, 09:29:26 AM »
My reference to quite dull refers to using a 600 grit ball on 24 feet of short oil.  Hammers may have been a bit more sanded compared to the U-Dot but still a bunch of surface for short oil.
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charlest

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Re: black u dot surface
« Reply #10 on: June 04, 2012, 11:32:04 AM »
Quote from: Urethane Game on June 04, 2012, 09:29:26 AM
My reference to quite dull refers to using a 600 grit ball on 24 feet of short oil.  Hammers may have been a bit more sanded compared to the U-Dot but still a bunch of surface for short oil.

Sorry, I misunderstood. Yes, I agree totally. I'd think that P2000 - P4000 grit might be better, depending on your rev rate and ball speed.
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r534me

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Re: black u dot surface
« Reply #11 on: June 04, 2012, 06:22:00 PM »
I used my blue hammer on a short ths and I was standing 25 and swinging to 8 at 8-10 at the break and it was barely holding.  I can safely state that 500 grit on a blue hammer does not work well on short patterns on high friction lanes.  I tried up the 2-3 board and it hooked before the arrows!

I ended up having better luck(but not much) with my tropical storm. 

My goal is to use the black u on 40 foot THS when the blue hooks too early. 

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kotm

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Re: black u dot surface
« Reply #12 on: June 05, 2012, 05:44:23 AM »
Quote from: r534me 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

a 30 micron sanding pad was the box factory finish.

Quote from: r534me on June 03, 2012, 11:25:24 PM
600 is pretty dull.  I don't think I have any green pads.  I can hit it with a 500 ab pad and use a gray pad to bring it to 800 to see what it does?  Basically, I need it a step or two below my blue hammer which is around 500.  I tried the blue at 800 and it works better on the fresh 40 feet ths at 500 but not so good when there is a little burn.

i would try p1000 and go smoother if necessary.
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charlest

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Re: black u dot surface
« Reply #13 on: June 05, 2012, 06:39:24 AM »
30 micron is equivalent to P500 FEPA grade or between 320 and 360 grit US/CAMI grade.
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r534me

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Re: black u dot surface
« Reply #14 on: June 05, 2012, 09:28:15 AM »
Sounds like I will try a 1k pad and go from there.  Thanks everyone.
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