Diamond Pocket Alteration

[eyesjr]

Seeing as it is time for new rails on my table, I’d like to tighten up the 4.75’s to 4.5. So my question is about the throat angle.

Do I maintain the angle that is there, and simply cut the rails longer, or do I make the throat of the pocket a little “more parallel” by changing the angle to tighten the holes?

Or in other words, what pocket angles for 4.5 corners? 141?

 

[Lawnboy77]

141 should be good for 4.5 in corners. Use the search function, this topic has been covered really well.

 

[Island Drive]

Here's exactly what you get when done properly.
Dave Isaccs (Diamond Table Mechanic, just did International table set ups and did the US Open 9 ball set ups this year, non pool player table mechanic.) Dave replaced all top rail underwood/pockets/cushions, and pocket facing angles and shimmed.
This pic is a true 4.5'' corner pocket opening, where both touching balls.... touch both pocket noses, mid ball.

 

[fastone371]

Here's exactly what you get when done properly.
Dave Isaccs (Diamond Table Mechanic, just did International table set ups and did the US Open 9 ball set ups this year, non pool player table mechanic.) Dave replaced all top rail underwood/pockets/cushions, and pocket facing angles and shimmed.
This pic is a true 4.5'' corner pocket opening, where both touching balls.... touch both pocket noses, mid ball.

Isn't that slightly smaller than 4 1/2", maybe 4 7/16"? It doesn't look like the ball fits up the equator, usually on a Diamond 4 1/2" pocket the balls will just fit into the opening at the equator of the balls.

 

[Island Drive]

Each ball is 2 1/4'' X 2 ='s.... 4.5''
The middle of each ball is touching both pocket noses mid ball.
If you don't think is correct, then ask Dave.
If you need a lesson, ask me not Dave.

bm

 

[rexus31]

Each ball is 2 1/4'' X 2 ='s.... 4.5''
The middle of each ball is touching both pocket noses mid ball.
If you don't think is correct, then ask Dave.
If you need a lesson, ask me not Dave.

bm

No need to be like that. Does this look like the center of each ball is at the point?

 

[Renegade_56]

No need to like that. Does this look like the center of each ball is at the point?

View attachment 802168

Very misleading picture there, if you look at the angle on the face of each side of the ball ang then draw a perpendicular line out at the ball contact point then it looks to me like it is easily correct, you could also simply measure point to point.

 

[rexus31]

you could also simply measure point to point.

Always the best way.

 

[fastone371]

No need to be like that. Does this look like the center of each ball is at the point?

View attachment 802168

Glad I'm not the only one who sees that. The line you drew from cushion point to cushion point really illustrates the equator of the balls because you can so clearly see the contact point between the 2 balls.

 

[fastone371]

Each ball is 2 1/4'' X 2 ='s.... 4.5''
The middle of each ball is touching both pocket noses mid ball.
If you don't think is correct, then ask Dave.
If you need a lesson, ask me not Dave.

bm

I guess I need a lesson in what other people visualize, do you offer that service?

 

[Renegade_56]

Glad I'm not the only one who sees that. The line you drew from cushion point to cushion point really illustrates the equator of the balls because you can so clearly see the contact point between the 2 balls.

If you could move the balls where the centers are on that line the contact point of the rail facing would be well inside the points. In other words, if the points are exactly 4.500, then the centerlines of the balls would both be almost 1/8" outside the line that goes from point to point.

 

[Island Drive]

I guess I need a lesson in what other people visualize, do you offer that service?

Not really, but I've got a few bad jokes.
Like I said, since this seems to be of concern, then call David Isaccs. Ft Collins. Easy to find and have him explain what your seeing. Phew. bye

 

[Renegade_56]

Each ball is 2 1/4'' X 2 ='s.... 4.5''
The middle of each ball is touching both pocket noses mid ball.
If you don't think is correct, then ask Dave.
If you need a lesson, ask me not Dave.

bm

If Dr. Dave says that is correct then both of you are mistaken. The pocket facings are at angles so then the center point of the ball when in contact with that point would be perpendicular to that angle. You statement would be correct if the pocket facings were at 45 degrees, but they are not.

 

[eyesjr]

141 should be good for 4.5 in corners. Use the search function, this topic has been covered really well.

Thanks man- I’ll look into the history of the topic on here.

 

[Island Drive]

I guess I need a lesson in what other people visualize, do you offer that service?

Not really, but I've got a few bad jokes.

If Dr. Dave says that is correct then both of you are mistaken. The pocket facings are at angles so then the center point of the ball when in contact with that point would be perpendicular to that angle. You statement would be correct if the pocket facings were at 45 degrees, but they are not.

POST #12....
Dave Isaacs, not Dr. Dave guys....

 

[eyesjr]

141 should be good for 4.5 in corners. Use the search function, this topic has been covered really well.

Funny thing- the search function doesn’t really take me to anything on the topic, but to a bunch of barking posts and aiming system jargon.

 

[Lawnboy77]

Yeah it would be nice to have a spreadsheet that had all the angles, both down and mitre, for a given size pocket. I think you can still find what you are looking for by digging through the archives here. The good thing about doing searches, at least for me, is that you end up learning a lot more about other related areas as well, not just the answers to a couple of questions.

Funny thing- the search function doesn’t really take me to anything on the topic, but to a bunch of barking posts and aiming system jargon.