2016-10-17 10:50 GMT-03:00 Dave Cole <linuxcncro...@gmail.com>: > Hi Leonardo, > > Unless you are going to be making thousands of these, I would buy or > have PVC extruded into the shape profile and then weld the PVC together > into that rectangular shape. > You could injection mold that part but it will require a large press. > You won't be making one of those as it is not economical. > There are presses out there that can easily mold parts that large. > Years ago I was at an industrial auction and they were selling injection > molding presses that were used to mold childrens play cars. The kind > where the kid climbs into the car. The play "cars" are about 4 feet > long. Anyway the company had several large presses and they were > being auctioned. I wasn't interested in the presses but I was > interested in how much they would sell for. The selling price started > at $1000 or so and none of them sold. The issue was the size and > weight of the presses. When the original presses were purchased they > were brought to the facility via rail car. The presses could not be > easily broken down into a size that could fit onto a semi trailer. The > mold platens were about 6 feet square. Consequently there was no > economical way to get the presses out of the building so they didn't > even sell, which was way below their scrap value. They didn't sell as > scrap since it would cost more to cut them up then they were worth. > Plus the machines were inside a building so the use of cutting torches > would be a liability problem. > > If you want to make a lot of these parts, I advise you to find a large > plastic injection molding company and show them your part and ask them > how much it would cost to make _x_ number of parts. If they have a > press that can handle the size, they will tell you. Having molds made > is routine for those companies, so they should be able to give you > prices for everything. > > I'm in the Midwest USA and this area has many injection molding > companies. Ohio, Indiana, and lower Michigan have many large > injection molding companies and plants. >
Well the idea is to make the parts on my own to reduce costs, since I have several shapes similar to that It will require a lot of molds and that's costly, at least the initial cost is to high. I'm going to make lots of parts and I came to this solution because buying the sheets is way too expensive for the final cost. At least here in my country. I can always find better prices in China I guess but if I can make the parts here it's going to be a lot easier. The problem is I really can't decide wich solution could be simpler, if the extruder or the injection. >From the top of my head the extruder looks simpler but I don't have any experience with that kind of machines so I can't say I'm sure it's the easiest way. -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
