How called this tool and it is possible to replace it?

I use a pair of sprue cutters. They are available at your local hobby store or online.

As rebelreenactor said, true sprue cutters work well. If you have an art supply store in your area look in the area for making bead necklaces. You can usually find the same cutters there for less. Also large clippers for finger nails or toe nails work pretty well.

Regardless of what you use, some things are just hard to cut from the sprue. I usually hold the part and the sprue between my fingers and let them absorb the snap when the cut is made. Then cutting the sprue piece off of the part is less easier.

Also, don't apologize for your English. You have made the effort to learn English while most of us cannot speak any other language.

Sprue cutter are good and extremely useful - but when I come across some really fine pieces, I cut them off whith a razor saw.

Carlos

From what I can see in the photo, what you have is a carton opener. Rather than replace the blade every time the point gets dull or broken, the blade is scored every 1/4 in or so, which allows you to push the entire blade forward that 1/4" and snapping the dull blade off with a pair of plyers and you now have a new sharp point on your knife. Unfortunetly, when you get a couple of the scored sections extended, the blade snaps on the scored lines very easily. But of course you have already discovered that fact already.

Although these knives are very cheap at a hardware store, would recommend you get an Exacto knife (either at your LHS or on line) or if you should happen to know a doctor see if he can help you get a scalpel and blades.

Hello Carlos. I would suggest you buy Spru-snippers too, watch for flying small parts when you snip away. Check your local hobby shop or sqaudron.com. Testors is one company that makes them. Hope this helps ya out.

This will help me?

Those would be Perfect!!!!

Hola Carlos

Saludos desde Costa Rica......

supongo que usted habla español por eso le contesto en nuestro idioma.....

Respecto a su problema he leído que para cortar piezas muy pequeñas o frágiles se puede usar un cuhillo calentado con una vela para desprenderlas del árbol, obviamente hay que cortar lejos de la pieza para liberarla y no derretirla, una vez fuera del árbol es mucho más fácil cortar el plástico sobrante sin riesgo de quebrar la pieza.

Con respecto a la herramienta de Squadron yo la tengo y sirve para piezas grandes, pero las puntas son muy gruesas y no sirve bien para piezas pequeñas, hay una marca Xuron que aparentemente es muy buena pero no la tengo en mi poder. A veces yo uso un corta uñas curvo de hecho tengo 2, uno grande y uno pequeño que hasta ahora me han funcionado bien.

Espero que esto le sirva de ayuda. Lo importante es recordar cortar lejos de la pieza y una vez liberada es mucho más facil cortarla casi con cualquier cosa.

Atentamente

Felipe Blanco G.

Another little trick it to cut the sprue away from the part so that you have about an inch of sprue connected to the small part. with your sprue cutters slowly trim away bits of the sprue untill your close enough to use a sanding stick and sand down the remaining few mm of plastic left connected to the small part. this way there is no distortion of the part from cutting stress (AKA that white color the plastic takes on when to much pressure is exerted on the plastic).