Dec 17, 2020 · Last Updated on Thu, 17 Dec 2020 | Decorative Joints. For a moderate price, you can convert your right-angle grinder into a random-orbit sander by installing one of these conversion kits. If you're looking for a less expensive way to get into random-orbit sanding and you already own a 41/? or 5-in. right-angle grinder, you can buy an aftermarket random-orbit sander head, thread it on the grinder's