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Tool Talk: Forstner Bits Middletown RI

The knife-edge is the most traditional Forstner design and does a great job of cutting nonstandard holes. That's because it has the fewest rim interruptions. Its rim is ground to create an inside bevel with a sharp knife-edge.

The Home Depot
(401)845-5092
878 W Main Road
Middletown, RI
Hours
Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

The Home Depot
(401)295-1184
1255 Ten Rod Road
North Kingstown, RI
Hours
Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

Woodcraft - Providence, RI
(401) 886-1175
1000 Division Street
East Greenwich, RI

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The Home Depot
(401)823-5173
700 Centre Of N E Blvd
Coventry, RI
Hours
Mon-Sat: 6:00am-9:00pm
Sun: 8:00am-7:00pm

One Stop Bldg Sply Ctr
(401) 847-8460
236 Connell Hwy
Newport, RI
 
St. Angelo Hardwoods, Inc. - Genuine Asian Teak Specialist
(401) 624-3900
490 Eagleville Road
Tiverton, RI

Data Provided by:
Good Wood
(508) 344-7888
1025 Drift Rd
Westport, MA

Data Provided by:
Liberty Cedar, Inc.
(401) 789-6626
325 Liberty Lane
West Kingston, RI

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Handren's Paint & Hardware
(401) 293-5290
3001 East Main Road
Portsmouth, RI
 
Jamestown True Value
(401) 423-2722
5 Narragansett Ave
Jamestown, RI
 
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Tool Talk: Forstner Bits

Tool Talk: Forstner Bits



Forstner-style bits can go where no other drill bits dare. The reason is simple: A Forstner bit is rim-guided while other bits are center-point guided. That means you can use all or only part of the bit's diameter to drill overlapped, angled or partial holes. Forstner bits also shine when it comes to drilling clean, precise 90-degree holes and large-diameter holes. Carbide-tipped Forstner-style bits excel at drilling the precise, flat-bottomed holes required for European-style hinges. Plus, unlike other drill bits, the rim-guided Forstner bit can drill into end grain without deflection. Forstner bits do have their drawbacks and are not a substitute for your everyday twist- or brad-point bits. For one thing, they are more expensive: A 1/4-in. Forstner bit costs between $3 and $23. They're also designed pri-marily for use in a drill press, although Forstner bits that are 1 in. or smaller can be used in a hand drill if the bit's center point is firmly engaged. Forstners also require a very slow rpm rate and thus are slow cutting. Finally, they are very difficult to sharpen.

Bit Types



Knife Edge
The knife-edge is the most traditional Forstner design and does a great job of cutting nonstandard holes. That's because it has the fewest rim interruptions. Its rim is ground to create an inside bevel with a sharp knife-edge. The rim scores the wood before the chip lifters remove the wood from the hole, creating a very smooth, flat-bottomed hole with no tear-out. The knife-edge rim's “rubbing” cut generates a lot of heat from friction. Because of this, the style is found primarily in 1-in.-dia. or smaller bits, whose rim speed is relatively slow. To avoid overheating, follow the speed recommendations that come with each bit.

Source:
Lee Valley, (800) 871-8158, www.leevalley.com, 1-in. Forstner bit, #06J71.16, $7.



Wavy Edge
A new Forstner rim design is the wavy edge. Manufacturers claim their wavy-edge bits run cooler than knife-edge Forstners. The idea is that the complex grind of the wavy edge creates ultrasharp points along the rim that help break up the wood chips for easier passage through the bit's throat openings. The wavy-edge rim performs just as well as the knife-edge does on 90-degree holes. However, holes drilled by a wavy-edge bit on a board's edge without the center point engaged have slightly rougher sidewalls than those made by the knife-edge bits. And starting a hole at an angle produces a bit of chatter until the center point engages.

Source:
Freud Diablo, (800) 334-4107, www.freudtools.com 1-in. Precision-Shear Forstner bit, #FB-007, $12.


Sawtooth/Multispur
These bits, with sawlike teeth ground into the rim, are great for drilling 90-degree holes. The rim teeth cut, rather than score, the wood, generating less heat and allowing a faster feed rate than knife-edge bits do. Because it can handle a higher rim speed, the sawtooth rim s...

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