mold question

[Lownslow]

i noticed some of you guys add runners(vents and fillers) during the molding process can i add them after both pieces of the mold are made?

[scale auto style]

i noticed some of you guys add runners(vents and fillers) during the molding process can i add them after both pieces of the mold are made?

to depend the kind of runner you want. in my case I can say yes. but the are use to vent the mold and are VERY easy to do. brass tube with a bit of pressure and VOILA you do a hole. but if you want to do your runner... do it before in the clay.. it will be much easier... in the other way you will screwup your mold 99% of the time.

hope this help

yours

sebastien

[Lownslow]

to depend the kind of runner you want. in my case I can say yes. but the are use to vent the mold and are VERY easy to do. brass tube with a bit of pressure and VOILA you do a hole. but if you want to do your runner... do it before in the clay.. it will be much easier... in the other way you will screwup your mold 99% of the time.

hope this help

yours

sebastien

you lost me, reason im asking is because i rather cut the filler and vent after molding

[Aaronw]

Silicone is really tough and flexible so hard to cut. I agree you are better off putting any vents in when you pour the silicone, not after it has cured.

I understand you might find a need for a vent in a cured mold, but why would you want to intentionally add them afterwards?

[Lownslow]

Silicone is really tough and flexible so hard to cut. I agree you are better off putting any vents in when you pour the silicone, not after it has cured.

I understand you might find a need for a vent in a cured mold, but why would you want to intentionally add them afterwards?

ill figure something out im in no rush to mold

[shucky]

Not sure what these guys are talking about. I've added most of my vent / pour holes after the molds cured. HSII mold rubber (which I use) is VERY soft and pliable and can be sliced very finely with a new Xacto or razor blade. I've not ever screwed up a mold adding pour and vent holes. In the Alumilite DVD they outline adding pour/vent holes and its after the molds cured. However, there are no set rules to resin casting and its kind of up to you to do what works best in your application(s).

Edited November 30, 2010 by shucky

[RyanSilva]

I almost always add my vent holes after molding, Like Mike, I use a sharp blade and it cuts like butter.

I even use my dremel and a drillbit to create circular vent holes.

[jeffb]

i add the vent holes afterwards. that way i can put em where theyre most needed

[Ghost1]

They go back and will add or change vent/ sprue lines in injection molding tooling. So as long as you are careful should work on this.