Threading should take place using a single point tool with a carbide insert. A hot nail or drill bit cuts through plastic easily. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. push it forward a little bit, to form a small plastic mass along the joint. The lid of the bucket provides an access door to the underside of the saw, for reaching in to change the belt. To avoid breathing them in, put on a respirator that is designed to filter fumes out. The plastic welding tool or a soldering iron can be used to melt a groove in the side of the foam to seat into the lip of the hatch. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. for D=0.250", a coolant should be used for H>0.250"). The back side of plastic parts should be supported to prevent chipping during drilling. The plastic becomes brittle after it is baked and it was easy to break while punching the holes. As a general rule, coolants should be used when the depth of the hole (H) exceeds bit diameter (D) (e.g. Also consider wearing a respirator to avoid inhaling any fumes. But if you just need a 6" holes in a bucket lid to drop a net pot into or a few small holes it's no big deal. For instance, you may want to smooth out a sharp, broken edge to repair a plastic part or you may want to repurpose a piece of plastic to make it into something else, such as when plastic is melted and then turned on a lathe. The holes can be normal to the workpiece surface or drilled at angles up to 25 degrees. Heat guns typically have low and high settings. This image may not be used by other entities without the express written consent of wikiHow, Inc.