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Get the injection molding machine working #928

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user8274 opened this issue Sep 25, 2018 · 8 comments

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@user8274
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commented Sep 25, 2018

  • The LED needs to removed and a new one soldered in.
  • We need to find out why plastic squashes out of the top when the piston is pushed in.
  • A new dial is needed to be made and attached. This could be 3d printed for example.
  • The housing for the LED and dial needs to be attached to the case
  • We need to find out why plastic doesn't come out of the nozzle when attempting to use. Is it blocked? If enough pressure is put on the piston some molten plastic leaks from around the top of the nozzle.
@MatthewCroughan

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commented Sep 25, 2018

@Sean-anotherone What is it that you said you were going to mill out at home? We should log these details here from now on.

@user8274

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commented Sep 25, 2018

I have partially disassembled the machine to make it easier to work on. If anyone needs information on how it is assembled please feel free to contact me.

@user8274

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commented Sep 25, 2018

As the nozzle is seemingly blocked, I have been trying to clean it. We took a sample of the residue and tested it with acetone. We also tested with fresh ABS. The fresh ABS dissolves as expected but the original residue and also new residue from heating fresh ABS would not dissolve. Based on this I think we cannot expects the usual solvents for feedstock plastics to work in cleaning the residue. We tried heating and running a shot but this did not work. I have also tried burning out the residue. This has removed residue but the nozzle still does not appear to be clear.

@Sean-anotherone

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commented Sep 25, 2018

@Sean-anotherone

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commented Sep 25, 2018

@Sean-anotherone

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commented Sep 27, 2018

I dropped off the loading chute this evening, it is repaired but a small spring or piece of elastic is required to hold the door closed.
Good to see all the crud removed from inside the cylinder, has anyone tried to unscrew the end yet ? One possibility to unblock might be to remove the nozzle and give it a good blast with a blowlamp - that'll melt anything plasticy that's left inside !

The cylinder might not need reaming. Now it is mostly cleaned out I wonder if dressing it with some emery on a split-stick with an electric drill might be enough to restore some kind of finish?

@johnmckerrell

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commented Dec 4, 2018

Any chance someone can update this ticket if there's more up to date information?

@Sean-anotherone

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commented Dec 4, 2018

I have not done anything further than already stated above - The fit between the piston and cylinder is the main fault right now and I can make a new piston, but with the state of the cylinder bore the effort may be wasted. I don't have a reamer big enough to clean the bore so it's a bit of a chicken & egg situation right now.

Also, is there a mould with which to test the machine?

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