who makes a parabolic cue

[JoeyInCali]

Hi,

A parabolic function is only one half or one side of a plotted parabola. This is referred to by many as a parabolic curve. A cue maker can use a portion of this curve to his liking to establish a segmented parabolic profile as part of a total compound taper of a butt or a shaft.



Rick

It then becomes a COMPOUND taper with a curve portion .
Of course ( it's not coarse by the way like 80-grit paper ) it's just my opinion.
It's also my opinion that some really don't get what DPK was trying to achieve with his taper.

If you look at that curve, you should get the idea ( not as dramatic as that one of course. Imagine a much larger dish ).

 

[scdiveteam]

It then becomes a COMPOUND taper with a curve portion .
Of course ( it's not coarse by the way like 80-grit paper ) it's just my opinion.
It's also my opinion that some really don't get what DPK was trying to achieve with his taper.

Now you got it!! That is what I have been saying all along. It must be compound because you could not get lets say .850 and 13mm or whatever with a parabolic curve in 29 inches.

My friend Todd has all the taper bars from the Omega Dpk shop and there is no magic just pain geometry transferred to a aluminum piece of flat bar.

David set up that equipment from what I was informed by John Wright.

 

[JoeyInCali]

Now you got it!!

My friend Todd has all the taper bars from the Omega Dpk shop and there is no magic just pain geometry transferred to a aluminum piece of flat bar.

David set up that equipment from what I was informed by John Wright.

The magic is in it's simplicity if you really look at it.
Straight lineS ( minus the transition of course which has to have some curve ) can achieve the same thing imo.
Besides, people roll cues so they freak out on some curved cues. lol
Heaven forbid the wrap is totally even like wood.

 

[scdiveteam]

The magic is in it's simplicity if you really look at it.
Straight lineS ( minus the transition of course which has to have some curve ) can achieve the same thing imo.
Besides, people roll cues so they freak out on some curved cues. lol
Heaven forbid the wrap is totally even like wood.

If you roll it on the table the gap should be constant. If you roll it with the butt on the rail there should be no elevation change at the joint when it is rolling.

 

[aphelps1]

Rick,
I have to disagree on one point with you. I have aligned my share of parabolic dishes, they truly are a 3D parabolic shape. The reflected RF energy is a conical shape reflected back to the focal point. I think that is what you meant.

Alan

 

[scdiveteam]

Rick,
I have to disagree on one point with you. I have aligned my share of parabolic dishes, they truly are a 3D parabolic shape. The reflected RF energy is a conical shape reflected back to the focal point. I think that is what you meant.

Alan

Alan,

I bend to your experience. My only experience was from many years ago working with Sony Parabolic Mic Dishes on location work as an amateur audio engineer. Those dishes seemed to be conical from what I recall.

I got this present info from this page concerning radar dishes.

http://www.radartutorial.eu/06.antennas/an10.en.html

It states in paragraph 4 that:

The real parabolic antennas pattern has a conical form because of irregularities in the production. I am sure this it not the case all the time after reading your post.

It seems to follow what the other guys were saying about it being difficult getting the CNC to make G code in this fashion.

Thanks,

Rick

 

[DaveK]

Alan,

I bend to your experience. My only experience was from many years ago working with Sony Parabolic Mic Dishes on location work as an amateur audio engineer. Those dishes seemed to be conical from what I recall.

I got this present info from this page concerning radar dishes.

http://www.radartutorial.eu/06.antennas/an10.en.html

It states in paragraph 4 that:

The real parabolic antennas pattern has a conical form because of irregularities in the production. I am sure this it not the case all the time after reading your post.

It seems to follow what the other guys were saying about it being difficult getting the CNC to make G code in this fashion.

Thanks,

Rick

:thud:

Dude, they are refering to the PATTERN having a conical shape, not the ANTENNA.

:thud:

Dave

 

[scdiveteam]

I knew I should have stayed away from that antenna comparison. It really was not germane to the topic anyway.


Thanks Dave,

Rick

 

[aphelps1]

Rick,
You know I'm just messin' with ya. Talking antennas and cues is like talking apples and groundhogs. I do like to banter on occasion though.

Smiles,
Alan

 

[ZiggyLee]

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[vasilios]

If i take my direct TV dish and put a triangle on it i will have a parabolic shaft.
Thanks for the info. Got to get a different case!


bill