Make a fender mold

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Make a fender mold

Make a fender mold

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AndrewL92	A AndrewL92 posted 5 Years Ago HOT Topic Details
A Group: Forum Members Posts: 6, Visits: 103	Ciao a tutti, avrei bisogno di qualche consiglio per realizzare uno stampo per un parabordo. Il parafango è in fibra di vetro e vorrei realizzarlo in fibra di carbonio. I miei dubbi riguardano i bordi che vanno verso l'interno e quindi creano angoli negativi che impediscono la creazione di un unico stampo. Poiché questi bordi si trovano su quasi tutti i lati del paraurti, quale pensi sia il modo giusto di procedere? Grazie mille
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Hanaldo	Hanaldo posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	+x AndrewL92 - 9/24/2020 1:43:40 PM Thanks for the reply. I know that from a photo it is not easy to understand but do you think it will be okay if I divide the mold in this way? Or do you suggest me to proceed differently, making more parts or dividing it differently? Doing it this way will result in super obvious flash lines on the finished part, right in the middle of the cosmetic areas. Much better to put your barriers on a radius where you can. For fenders, you generally do the main 'face' of the guard as one piece, and then each of the mounting flanges where it returns on itself can be split along the radius. So for these guards, you will likely end up with at least a 3, potentially a 4 piece mould.
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Make a fender mold

AndrewL92 - 5 Years Ago

You will likely need a split mould to mould those inner return lips to avoid mechanical locking. If you inspect the GRP one carefully you may still see traces of the flash lines which will tell you.....

Warren (Staff) - 5 Years Ago

Thanks for the reply. I know that from a photo it is not easy to understand but do you think it will be okay if I divide the mold in this way? Or do you suggest me to proceed differently, making more...

AndrewL92 - 5 Years Ago

Doing it this way will result in super obvious flash lines on the finished part, right in the middle of the cosmetic areas. Much better to put your barriers on a radius where you can. For fenders,.....

Hanaldo - 5 Years Ago

As Hanaldo said. It also makes demoulding easier as you can demould each flange/edge then the part should pop out quite easily as its just a large flat surface.

Warren (Staff) - 5 Years Ago

I tried to create the mold following your advice. I made a first mold for the main fender area and then a mold for each of the mounting flanges. This is the result. There are small flaws, but...

AndrewL92 - 5 Years Ago

No reason why you can't use it, some of those flange shapes are going to make things challenging for you but it's certainly usable. You either need to seal the flanges with something before bolting....

Hanaldo - 5 Years Ago

Regarding the sealing mould parts. Would you say that gum tape in 2mm recess integrated in the flange works better than gelcoat method? I used RVT silicon befor but as mentioned its a pain to clean...

beliblisk - 5 Years Ago

Tried it, but didn't find it very reliable. The tape tends to compress quite easily, and it often ends up that in some areas it doesn't contact the opposite flange properly and doesn't seal. It also....

Hanaldo - 5 Years Ago

So we actually have to choose lesser evil in this case and dummy vacuum befor actually laying any of the materials. I used gasket type rvt on custumers tools (quality wasnt the best) and i actually....

beliblisk - 5 Years Ago

Thanks for the reply. I understand what you said. The only doubt I have is how to arrange the taky tape all around the perimeter, without any leakage, especially where the vertical and horizontal...

AndrewL92 - 5 Years Ago

Yes that's definitely the tricky bit now, I can foresee you struggling with leaks. I'm not sure i follow what you mean about cutting the flanges. I certainly wouldn't make them any shorter if that's...

Hanaldo - 5 Years Ago

I'm probably saying nonsense but yes, the idea was to include the top flanges in the bag. I made an image to make you see well. The black lines are where I would like to cut, and the red one where I....

AndrewL92 - 5 Years Ago

Oh I see, no dont do that. Resin will go everywhere and make a big mess, and you will likely still struggle to get a seal due the bolt holes. Just run your sealant tape around the perimeter of the.....

Hanaldo - 5 Years Ago

Perfect, then proceed as you advised me. In this regard, I had some questions: 1. if I use gelcoat, to make a bead between the flanges, as you advised, how long do I have to wait to close the flange...

AndrewL92 - 5 Years Ago

1. Yes, bolt the flanges together as soon as you have applied the gelcoat. In all likelihood you will find the gelcoat will be starting to thicken up as you are ready to bolt the flanges on, which is...

Hanaldo - 5 Years Ago

Put mixed gelcoat in plastic food bag, squeeze it in one corner, twist bag around so you end up with all gelocoat trapped in one corner and then just nipp off tge corner (much like if you are baking....

beliblisk - 5 Years Ago

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