A rotary (or spiral) saw is a small device that uses high-speed motor power to spin a bit that cuts sideways.
It is used primarily to carve out irregular shapes from thin materials, such as drywall and plywood.
A variety of accessories and attachments greatly increase the versatility of this tool.
At first glance, a rotary saw and a rotary tool appear to be quite similar, but their purposes are rather different.
The rotary saw, also known as a spiral saw, is especially designed to cut wood, plastic, ceramic, drywall and other thin materials with precision. Unlike a jigsaw blade, which cuts in a single direction only, the rotary saw bit allows for multidirectional cuts, such as the 90-degree cuts needed for electrical outlets, one of its primary uses. A cutting guide ensures that the bit remains perpendicular to the surface being cut.
A rotary tool is incredibly versatile. It is particularly useful for detail work in handicrafts, carving and do-it-yourself projects, as well as for heavier applications, like cutting nails with the addition of a small grinder. It can even cut out drywall, but since it's not specifically designed for this application and the motor is not as powerful as that of a rotary saw, such a job would take longer.
If you need a tool to help you with small household jobs, handicrafts and simple do-it-yourself projects, choose the rotary tool.
For more heavy-duty and frequent cut-out work on materials such as plywood or drywall, the rotary saw, described in this guide, is the ideal tool.
1- On/Off Switch
Switch to start or stop the motor.
Rotary saw motors vary in power from 4 A to 7 A. This is powerful enough to cut through surfaces made of wood, plastic, ceramic, fibreglass or drywall up to 1" thick. The saw is usually equipped with either a single or a dual-speed motor, although variable-speed models are also available. A 6-A motor running at 30,000 RPM is perfect for most jobs.
Opt for a motor with a soft-start feature and, ideally, replaceable brushes to extend the life of the motor and the saw.
3- Hand Strap
Some rotary saws come with a strap or handle for easier handling.
4- Spindle Lock Button
The spindle lock button prevents the shaft from rotating during bit or collet changes.
5- Cutting Guide Locking Lever
This lever ensures that the cutting guide is held securely in place.
The chuck contains a collet (or jaw) that closes when the chuck is tightened, holding the bit in place. Collets come in different diameters to hold various bit shank sizes.
7- Depth Guide
The depth guide improves control and ensures accurate cutting depth.
8- Depth Adjustment Screw
Use this screw to set the depth guide to your desired cutting depth.
Weight and Portability
For intensive or regular use on solid materials such as wood, masonry or ceramic, a corded model is recommended. A cordless model is handy for lighter jobs, such as cutting drywall. Rotary saws are targeted primarily to professional tool users.
A rotary saw is a specialized and powerful tool that allows you to execute a range of related tasks efficiently and effectively. Note that some jobs listed below will require an attachment or accessory that is sold separately, such as grinder adapters.
Rotary saws come with different attachments and accessories that increase the tool’s versatility.
Nice to have