Need help with work-steps for bulding a cylindrical shape

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#1

I’m new in fiber jobs, I did my research on youtube and other sources.

I’m planning to build a housing for a 18" axial fan with glass & basalt fiber.
(Picture of the housing, see attachment.)

What I already purchased:
-Protect ointment for hands
-disposable Nitril gloves
-protective mask for aerosol
-protective mask for dust
-safety goggles

-2k polyester mastic
-Axel Paste-WIZ HC (Paste mold release agent)
-1Kg Epoxy Resin (Only in German, https://shop.swiss-composite.ch/shop/resources/downloads/t-Epoxydharz-Typ-L-mit-Haerter-d.pdf)
-Scissors with small teeths
-Roller
-a small room with an electric heater.

-2 layers glassfiber twill 390gr/m2 (14oz)
-1 layers (inside and outside) basaltfiber twill 220gr/m2 (8oz)

I need to build first a two-part mold with polystyrene.

Now the Steps…?
-polyester mastic and grind.
-5 layers paste mold, let it dry four a couple of hours
-mixing the epoxy resin (Is there any rule, how much I need?)
-the first coat resin with a brush on the howle mold
-put first layer fiberglass on the mold and apply resin with brusch
-starting at the cylindrical part with the roller an then to both cone parts
-apply resin with brush
-second layer glass
-apply resin with brush
-roller
-let it dry for 24h @ 25°C

-remove the mold
-grind gently both sides
-apply resin with brush
-put basaltfiber on the mold
-apply resin with brush
-roller
-let it dry for 24h @ 25°C
-remove borders

Any suggestions or advice would be much appreciated!

#2

Help from anyone?

#3

You want help on making the mould or the part? Confused. The part is cylindrical? So you will split the mould in half using parting flange? or you will CNC plugs? What process to make your part? Hand lamination, infusion, prepreg, autoclave, RTM? You can easily splash a mould using gelcoat, CSM fiberglass and VE or PE resin if your tool requirement is low, but depends on your part process.

#4

I have made a large duct similar.

This one is moulded outside and inside.

#5

I need help to make the cylindrical part (like the picture from fasta) with hand lamination.
The mold is only needed for the inside.

(I don’t work with gelcoat, the expoy and the basalt fiber is uv-stable.)

I’m not sure, if the “wet” layers with fiberglass and basalt simply falling apart because of the gravity?
(The mold could be fixed to a board, with the bell mouth looking upstairs.)

Has the fiberglass and basalt twill cloth enough drapability to stretch it over the mouth bell and and the cone?
Or should I cut parts from the cloth?

Which product should I use, to remove the wax from the fiberglass part befor sanding?

#6

Sounds like you are on the right track.

Make sure your paste wax is really cured, overnight even. Or use a PVA too.

The fabrics are going to have joins in them somewhere so just make clean and simple cuts to make the layup easy for you.

I don’t understand your end part where you removed it from the mould but then did more and removed borders??

I don’t know of any UV stable epoxy resins. I think the resin suppliers just like to hint that there is some UV stability to help sell their products.

#7

Thanks for the feedback!

I don’t understand your end part where you removed it from the mould but then did more and removed borders??

–> After the fiberglass, I remove the mold, add basalt fabric to the inside and outside.

I don’t know of any UV stable epoxy resins. I think the resin suppliers just like to hint that there is some UV stability to help sell their products.

–> I misread something, for uv stability the add a special coat.