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Newbie questions. Complicated part fabricating.
Newbie questions. Complicated part fabricating.
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Newbie questions. Complicated part fabricating.
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svedberg
svedberg
posted 9 Years Ago
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Hi!
I'm a racing motorcycle nut from Sweden. I have a lot of questions regarding my very first prepreg project, a tank/seat combination for a race bike I've been working on forever, it seems.
The mould is 5-piece design made from the Uni-mould system. The part to be made is a quite complicated shape, fully enclosed by the mould, featuring a LOT of curves, sharp edges/corners and also some mounting points that must be very strong.
At first I wasn't even considering using prepreg, but after having thought long and hard about this layup, I came to the conclusion that no other method is possible. A wet layup would inevitably cause a total mess because of the limited space inside the mould, and infusion would be very tricky as well.
Using prepreg will allow me the time to lay up the fabric very carefully and free of messy resin, and I can prepare and test the vacuum bag until all is perfect.
Now some questions:
The part will be painted, as I'm not a big fan of the glossy carbon look. Therefore, the surface layer weave direction doesn't matter a lot to me, appearance-wise. Since the part is very complicated, I am thinking about cutting smaller pieces of the surface layer prepreg to increase my chances of getting the fabric perfectly tight into all the sharp edges/corners of the mould, in order to avoid bridging problems. After that, I'll be cutting the bigger pieces and continue normally with the layup. Thoughts on this approach?
The mounting points will need to be very strong. I am thinking of bonding aluminium/titanium inserts in these areas. Even so, the laminate needs to be considerably heavier/thicker around these areas. I am thinking of making these areas in two steps: At first, just laminate the whole part using 1 215g surface layer, and 2 450g layers. Then, after curing the part continue to build up additional strength around the mounting points, adding maybe 5 more layers of 415g and curing again. Am I thinking straight here?
Hoping for opinions from those more experienced!
Thanks/
Lasse Svedberg
Racing motorcycles!
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morepower
morepower
posted 9 Years Ago
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Cheers Fred..
It is just time and taking care to get things done correctly. I used to rush into making parts and sort of wanted to get it made and see the results as soon as possible. But it is better to take your time and just do it right.
This is from a few years ago when I was still doing things for a bit of fun and out of the garage at home.
https://www.youtube.com/watch?v=ZHWThhjV0K4
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9 Years Ago by
morepower
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Newbie questions. Complicated part fabricating.
svedberg
-
9 Years Ago
Here's a picture of the (nt really finished) plug for the part I'm making, by the way. It's the...
svedberg
-
9 Years Ago
Regarding the layup technique, cutting small pieces is fine, but you will be reducing the strength...
Hanaldo
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9 Years Ago
Thanks for the reply! Regarding the mounting points: They are some of the most difficult areas...
svedberg
-
9 Years Ago
I have been offered a great deal from a composites supplier close to where I live to buy an OOA...
svedberg
-
9 Years Ago
Hanaldo is right.. Laying up with larger sections will be the best for strength. I have to use 2...
morepower
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9 Years Ago
Thanks Morepower! Very nice units you've got there for the RS250! And very similar to the parts I'm...
svedberg
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9 Years Ago
Ok I will try and answer what I can below directly..... [quote][b]svedberg...
morepower
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9 Years Ago
[quote][b]morepower (13/03/2016)[/b][hr]Ok I will try and answer what I can below directly........
fgayford
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9 Years Ago
Hi Lasse be great to see the bike finished, I follow your build on 400gb. @ moorespeed, do you...
VVS
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9 Years Ago
[quote][b]VVS (13/03/2016)[/b][hr]Hi Lasse be great to see the bike finished, I follow your build on...
morepower
-
9 Years Ago
Morepower: Again, thank you, and thumbs up to you for sharing your hard earned experience, I...
svedberg
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9 Years Ago
[quote][b]svedberg (14/03/2016)[/b][hr]Morepower: Again, thank you, and thumbs up to you for...
morepower
-
9 Years Ago
Thanks Morepower! This input is extremely helpful, for sure. I'll probably get back again with...
svedberg
-
9 Years Ago
Oven build going on...got myself a used double king size stainless industrial freezer cabinet for...
svedberg
-
9 Years Ago
Cheers Fred.. It is just time and taking care to get things done correctly. I used to rush into...
morepower
-
9 Years Ago
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