A Compact Metric Drill Index

[RJSakowski]

Did you end up with a solid chunk without porosity in your slug RJ ? I'm curious . The wedges ended up being porous due the extruders just dumping into the mold and not under any pressure . It would be cool to make up a few cheap arse molds and be able to dump the heated plastic right into them , or put the mold onto a hotplate and melt it . Hm ..................you have me thinking .

I had air inclusions in my slug but I attributed that to my method of heating. Even though I made an "oven" out of fire brick, the bottom was cooling below the melt point. I expect that the temperature has to be a fair degree hotter than the melt point to get good flow or to allow air inclusions to work their way to the surface. As i recall, the temperature for injection molding was fairly close to the melt point so minimize shrinkage and warping. We also used a fairly high pressure to pack the mold.

 

[RJSakowski]

I have an old Fry Daddy deep fat fryer that will melt PP. I tried it today and the temperature will reach 450ºF. The PP that I used solidifies at 300ºF. At 450ºF, it is definitely molten although it appears to be too viscous to easily pour.

 

[woodchucker]

I have an old Fry Daddy deep fat fryer that will melt PP. I tried it today and the temperature will reach 450ºF. The PP that I used solidifies at 300ºF. At 450ºF, it is definitely molten although it appears to be too viscous to easily pour.

Put some mold release on the fryer, and when it solidifies put a wood screw or a few in and pull out the chunk.
Or put some Aluminum foil inside, line the inside.

 

[RJSakowski]

Put some mold release on the fryer, and when it solidifies put a wood screw or a few in and pull out the chunk.
Or put some Aluminum foil inside, line the inside.

No need. The PP shrinks as it cools and lifts right off the Teflon coating.