#4111  
Old 11-13-2013, 09:48 AM
Timkid Timkid is offline
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Quote:
Originally Posted by MarkDSM View Post
Yo.. Picked up a Opto Pure, bright yellow 176.. I want 4 more now ... where do I find NOW ? ..difficulty, my try out baby has a lot of excess flash which gives me confidence beach tossing stable
http://www.discgolfcenter.com/main_d...=492&PPQT1=247
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  #4112  
Old 11-13-2013, 09:50 AM
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whitefedora whitefedora is offline
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Maybe he picked it up from the ground? And wants to know other grassy knolls that contain opto pures
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  #4113  
Old 11-13-2013, 11:31 AM
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MrFixIt MrFixIt is offline
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Quote:
Originally Posted by whitefedora View Post
Maybe he picked it up from the ground? And wants to know other grassy knolls that contain opto pures
There we go with the whole "grassy knoll" theory again...
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  #4114  
Old 11-13-2013, 11:41 PM
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knettles knettles is offline
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I have to leave this thread before my grammar nazi brain explodes.
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  #4115  
Old 11-17-2013, 04:15 PM
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bobmcnelly bobmcnelly is offline
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I hear a lot of talk about flashing on the forums. What is flashing and how does it effect the disc?
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  #4116  
Old 11-17-2013, 04:28 PM
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Curtis_Valk Curtis_Valk is offline
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Flashing is a thin line of plastic left over from the molding process (where the mold halves meet I believe). Do you remember having to trim the flashing off plastic model pieces when you were young?

From my experience and what I've read here, the flashing will make the disc more overstable. It doesn't take long to wear off being thin, so discs can change rapidly when fairly new then settle down.

Curtis
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  #4117  
Old 11-17-2013, 04:30 PM
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Aim For The Chains Aim For The Chains is offline
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flashing is how excess plastic which forms on a mold during the injection molding process is described/measured. If you feel the bottom of the rim on a new disc you will feel a sharp additional raised part of the disc which is not uniform to the mold but happens due to the molding process and is sometimes trimmed or executed better than others. Discs also generally have small witness marks. A lot of additional flashing will be uncomfortable and make a disc act more overstable than it should.

Flash, also known as flashing, is excess material attached to a molded, forged, or cast product, which must usually be removed. This is typically caused by leakage of the material between the two surfaces of a mold (beginning along the parting line[1]) or between the base material and the mold (in the case of overmolding). Molding flash is seen when the optimized parameter on cull height is not calibrated[citation needed]. Proper design of mold parting surfaces can reduce or eliminate flash.
Molding flash can be caused from old or worn mold cavities that no longer fit tightly together. Other times, the complexity of the part requires so many mating pieces with such precise geometries that it is almost impossible to create a perfect fit on every impression. Most often, the type of material being molded, and its attendant viscosity in its liquid form, is the primary factor that leads to the creation of the unwanted mold flashThe process of removing flash, known as deflashing, is commonly performed via cutting, breaking, grinding, or tumbling. Some foundries use robot autogrinders to remove this unwanted material.

Witness mark--
In plastic injection, a faint mark called witness mark (or witness line) will occur along the parting line.[1] This is unavoidable and is usually accepted despite minor aesthetics issue. However, some part surfaces (e.g. when used for sealing[4]) cannot tolerate witness mark, and thus either the mark must be removed post-molding or the mold redesigned.
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  #4118  
Old 11-17-2013, 04:44 PM
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bobmcnelly bobmcnelly is offline
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Thanks for the knowledge!
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  #4119  
Old 11-18-2013, 08:15 AM
Hector Chain Hector Chain is offline
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What are closed hips vs open hips? Are there drills or other ways to help open the hips?
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  #4120  
Old 11-18-2013, 09:17 AM
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Aim For The Chains Aim For The Chains is offline
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that's kind of deep in regards to over all technique but basically getting your hips/core into the throw. Think of it for now like you are staying faced away from the target as long as possible in the reachback and not opening up your body too early trying to generate power-- letting your arm be a lever controlled by the core and hips/shoulders are the main focus points. You can see an closed stance nearly in any pro who is throwing or form video and its part of keeping your overall mechanics in-line. If you rotate open early you often are off balanced, aiming all over, high to low/downward pull-thoughs, no acceleration often strong arm.
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