lyleoross
* Ace Member *
Why do different polymers have different flight stability? Is it that they have different warpage?
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I love getting the real-deal info on how things work. This is really interesting.
One question about metal flake: It's not really metal, right? I think I saw someone get an answer directly from a manufacturer confirming that.
Why do different polymers have different flight stability? Is it that they have different warpage?
They have different shrink rates which results in different warpage.
My question relates to mold size and item weight. When companies make a mold (i.e. disc) a certain weight, I assume they control density of the injected material (cuz aren't the Star, Champ, Blizzard, Pro, and DX often from the same dye or cast?). So if I want a max weight Firebird, or Nuke, or Aviar, I'm designing that before I inject the plastic, right?
Now my question. If that disc was designed to be 175 grams but weighs 172g or 177g on a scale, then what happened? Was some of the mold underfilled? Or was the density just off?
OP here. You're right that most of the cooling occurs in the mold. Climate does have an effect on the final shape of the disc since it will continue to shrink for a few hours after it leaves the tool, but it's not as major of an effect as some of the other things I listed. I'd reckon that how they store the discs immediately after they cut the sprues off has a larger effect. If they stack them, the ones on the bottom are going to have a different shape than the ones on top.
Its not in the mold, its stamped on the disc. It's actually a relief, not an emboss
Newer discs from Discraft have the names embossed on the inside of the rim.
I really dont think they have a mold piece that says 167g, 168g, 169g for each weigth, and swap it as needed. I think it is some kind of post process. Now the mold name I could see since that ought not change. Didnt they say that the guys weigh a stack of 10 and then divide by 10 and pen them all the same. Thats how you end up with "penned 172 scaled 173.4" posts
Each disc is individually weighed and marked as it is produced. Discs are not weighed in groups of ten and then averaged.
Since pictures are worth a thousand words, please watch the Gateway video posted above. Note that Dave Mac takes the disc from the machine, clips the sprue and places the disc on a triple beam balance scale. Dave then adjusts the scale and writes the weight on the back of the disc and places the disc on the table to finish cooling. Dave doesn't stack 10 discs on the scale and weigh them together - he weighs each disc individually as it is produced.
Over 10 years ago some poster theorized on the PDGA message board that 10 discs are weighed at a time to explain why weights could be different than marked. Posters continue to spread the "10 discs are weighed together" myth/theory even though the weighing process is clearly visible in the Gateway video.
Gateways operation above is probably different than say innovas though.
It's not Dave who's weighing the discs in the video. (Unless by some freak coincidence that dude is also named Dave Mac)
The video features David McCormack, the owner of Gateway discs.... aka DaveMac.
Each disc is individually weighed and marked as it is produced. Discs are not weighed in groups of ten and then averaged.
*SNIP*
Since pictures are worth a thousand words, please watch the Gateway video posted above.
*SNIP*
even though the weighing process is clearly visible in the Gateway video.