I've never seen a table with lift-out slate...? All the recovers I've seen, the rails are put on after the cloth.
pj
chgo
I am most familiar with bar tables, which you have to lift up the slate to put the felt on.
I've never seen a table with lift-out slate...? All the recovers I've seen, the rails are put on after the cloth.
pj
chgo
HUH???? You don't move slate to put on cloth. You obviously have never re-covered a table.
And you're worried about WPA specs???? Please. Every top mechanic i've ever seen uses 12" machinists levels. Mark Gregory sometimes uses six at a time.I am most familiar with bar tables, which you have to lift up the slate to put the felt on.
A 12" Starrett Machinists Level has precision of 0.005 inches per foot.
How did you come up with this?For a regulation table that equates to 0.0225 inches across the width of the table.
You are confusing the specification for flatness of the slate with level of the playing surface.The WPA equipment specifications call for an overall flatness within .010 inches across the width of the table. Therefore the 12" Starrett Machinists Level is not accurate enough to do the job right.
Yep. Flat and level are NOT the same thing. Slates are machined so each piece is FLAT. When assembled they are LEVELED.How did you come up with this?
You are confusing the specification for flatness of the slate with level of the playing surface.
Thanks for your reply. I think this is the first one that articulates a specification for level for the table, which you state, if I interpret it correctly, is 0,01º. If my trig serves me well, that's 0.002"/ft., which I think is too strict; it's less than the sensitivity of the machinist's level the pros use, which is 0.005"/ft. So, maybe you are off my a decimal point? A spec of 0.1º would be 0.021"/ft., which seems more reasonable to me, and corresponds to what I read in the Brunswick Gold Crown I 1961 service manual. )The Starrett model 98, 8", 0.005"/ft. level goes for about $150, new.)
How did you come up with this?
You are confusing the specification for flatness of the slate with level of the playing surface.
And you're worried about WPA specs???? Please. Every top mechanic i've ever seen uses 12" machinists levels. Mark Gregory sometimes uses six at a time.
You are right, I was off by a decimal point.
The WPA specs say "overall flatness within + .020 inches [.508 mm] lengthwise and + .010 inches [.254 mm] across the width"
Width of a regulation table is 54".
That makes the tolerance angle = arctan(0.1" / 54") = arctan(0.001852) = 0.106 degrees.
Still, the engineering levels are good enough but the regular store-bought levels are not.
This is a surprisingly good thread. Very informative, vigorous discussion.
I'm almost surprised no one has tried to dump on the thread yet...
Great topic!!!
That makes no sense whatsoever. So you cherried out the level on the naked table...then what? You have to lift the slate out, install the felt, then put the slate back, then re-level the table because you moved the slate.
Why would you have to lift the slate out? What type of table are you referring to that you would have to lift the slate out?
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Isn't there a mismatch there (in red) - making the angle 0.0106 degrees?You are right, I was off by a decimal point.
The WPA specs say "overall flatness within + .020 inches [.508 mm] lengthwise and + .010 inches [.254 mm] across the width"
Width of a regulation table is 54".
That makes the tolerance angle = arctan(0.1" / 54") = arctan(0.001852) = 0.106 degrees.
Still, the engineering levels are good enough but the regular store-bought levels are not.
On a 7' table you do.
use something like this, get close, be happy, learn to play the roll :wink:
https://www.amazon.com/exec/obidos/ASIN/B00FNNV1T8/ezvid02-20