Re: [Emc-users] Wat OT: Question about injection molding of PVC

On 10/20/2016 06:15 PM, Dave Cole wrote: ... snip > If it was wavy then they were probably having quality issues. The OD is > the critical thing with PVC pipe that uses glued socket fittings. ... snip I have noticed the same ID thing with PVC pipe here. The OD is very accurate, straight and

Re: [Emc-users] Wat OT: Question about injection molding of PVC

inal Message - > From: "Dave Cole" <linuxcncro...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Wednesday, October 19, 2016 11:49:08 PM > Subject: Re: [Emc-users] Wat OT: Question about injection

Re: [Emc-users] Wat OT: Question about injection molding of PVC

t; To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Wednesday, October 19, 2016 11:49:08 PM Subject: Re: [Emc-users] Wat OT: Question about injection molding of PVC Ive never seen it poured.However think of all of the things that are extruded out of PVC

Re: [Emc-users] Wat OT: Question about injection molding of PVC

Ive never seen it poured.However think of all of the things that are extruded out of PVC in high volume. PVC pipe, gutter, fence posts, window frames, vinyl siding and trim. The trick will probably be finding a place that extrudes PVC in small quantities. Most of the plastic pipe

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-17 10:50 GMT-03:00 Dave Cole : > 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

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-17 9:50 GMT-03:00 craig : > I don;t know what resources you have there. > > Minimum equipment approach > > 1 Heat the plastic and pour the rectangular shape oversize, Possibly > flattening down and spread it out as > you do. (How much it spreads naturally will be

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-16 21:42 GMT-03:00 andy pugh : > Sorry, no. I have absolutely no experience at either approach. I am > interested in the technologies, but purely as an observer. The only > thing I have ever looked at injection moulding was way outside normal > parameters. We were

Re: [Emc-users] Wat OT: Question about injection molding of PVC

Shear the pieces off a sheet then have a shop that does custom vinyl windows miter and weld the corners. -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org!

Re: [Emc-users] Wat OT: Question about injection molding of PVC

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

Re: [Emc-users] Wat OT: Question about injection molding of PVC

I don;t know what resources you have there. Minimum equipment approach 1 Heat the plastic and pour the rectangular shape oversize, Possibly flattening down and spread it out as you do. (How much it spreads naturally will be dependent on both material and surface temperature. If you

Re: [Emc-users] Wat OT: Question about injection molding of PVC

On 17 October 2016 at 00:37, Leonardo Marsaglia wrote: > That would be a good way of doing it too. Do you think that making the > extruder could be less complicated than making the injection mold and > piston? Sorry, no. I have absolutely no experience at either

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-16 19:12 GMT-03:00 andy pugh : > > Why not extrude the full width, cut out the centre, and put the > cut-out part back in the extruder? > > It might even be possible to extrude with a hole on the middle if the > extrusion nozzle had a gate in it. I don't even know if

Re: [Emc-users] Wat OT: Question about injection molding of PVC

On 16 October 2016 at 16:01, Leonardo Marsaglia wrote: > Another idea that comes to my mind but I don't know how doable it could be, > is to have like an extruder than can make the turn and make the bend Why not extrude the full width, cut out the centre, and put

Re: [Emc-users] Wat OT: Question about injection molding of PVC

Thanks to all for your answers! I'll try to answer in one reply so I don't make a mess with the conversation. I've thought about pouring it as Marcus suggested but as you've said and from what I was reading on forums and so, it's quite difficult in my case because of the shape and lenght of my

Re: [Emc-users] Wat OT: Question about injection molding of PVC

On 10/15/2016 5:12 PM, Leonardo Marsaglia wrote: > Hello to all. > > I'm sure here I'm going to find good answers so I decided to start from > here. > > I'm planning to do some thermoforming production work but the sheet plastic > I need to use is rectangular with a rectangular hole in the middle

Re: [Emc-users] Wat OT: Question about injection molding of PVC

PVC flooring is roilled out in long strips and then joint welded by little automatic machines, running along, following the joint by a sensor stick and equipped with a hot air fan and a roll of 4 mm PVC wire. Every floor working shop has been using them for a long time. PVC welding is easy. No

Re: [Emc-users] Wat OT: Question about injection molding of PVC

if the picture is the final product... why not air weld 4 strips together? chamfer the mating edges and fill with 'rod' of same material google 'weld pvc' for more this is used on plastic window sets as example parts of Linuxcnc Hal and tricks from machinekit/reprap extruders can be used to

Re: [Emc-users] Wat OT: Question about injection molding of PVC

I machine moulds for a local company which pours PVC into the mould (think a deep groove, open at the top). The finish on the top surface (open to the air) is very good, but maybe not quite as consistent over such a long length as you need, compared to injection moulding. The company do

Re: [Emc-users] Wat OT: Question about injection molding of PVC

When I worked for a semi conductor tool manufacture we used to plastic weld the drip trays out of PVC and Chemistry tanks out of other plastics for HF, H2SO4 and other nastiness. The process is very similar to Tig welding metal. We used a hot air gun and a filler rod to fuse and fill the

Re: [Emc-users] Wat OT: Question about injection molding of PVC

-users@lists.sourceforge.net Sent: Saturday, October 15, 2016 7:33 PM Subject: Re: [Emc-users] Wat OT: Question about injection molding of PVC Injection pressure will be trying to force the two sides of your mold apart. That's why injection molds are made of tool steel, and injection machines have

Re: [Emc-users] Wat OT: Question about injection molding of PVC

On 15.10.16 22:44, Leonardo Marsaglia wrote: > Yes the idea is to machine the four strips and then joing them strongly. To > clamp the mold I was thinking about mechanical ways like eccentrics or may > be screw clamps. That way I can hold the mold together when the injection > takes place. I

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-15 22:33 GMT-03:00 John Kasunich : > Injection pressure will be trying to force the two sides of your mold > apart. > That's why injection molds are made of tool steel, and injection machines > have VERY sturdy construction to hold the mold closed. I saw a machine

Re: [Emc-users] Wat OT: Question about injection molding of PVC

Injection pressure will be trying to force the two sides of your mold apart. That's why injection molds are made of tool steel, and injection machines have VERY sturdy construction to hold the mold closed. I saw a machine that might be big enough to make your parts - the mold closing cylinder