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Tool Talk: Forstner Bits Conway SC

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
(843)916-2229
951 Oak Forest Lane
Myrtle Beach, SC
Hours
Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

Kmart 7555 / Cross Merch
(843) 248-2411
1610 Church St
Conway, SC
Store Hours
Miscellaneous
Store Type
Miscellaneous
Hours
Monday To Friday Working Hours is :8-22 and for Sat:8-22
Sun:8-21
Store Features
Monday To Friday Working Hours is :8-22 and for Sat:8-22
Sun:8-21

Terry's Do it Best Hardware
(843) 365-9300
5275 Hwy 501 West
Conway, SC
 
Lowe's
(843) 650-1400
8672 Highway 17 Bypass
Myrtle Beach, SC
Hours
M-SA 6 am - 10 pm
SU 8 am - 8 pm

Fastenal- Myrtle Beach
843-626-9009
1580 Stockholder Ave Unit C Myrtle Beach, SC, 29577
Myrtle Beach, SC
 
The Home Depot
(843)357-3777
12262 Hwy 17 Bypass
Murrells Inlet, SC
Hours
Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

LOWE'S OF CONWAY, SC
843 234-6033
2301 HIGHWAY 501 EAST CONWAY, SC, 29526
Conway, SC
 
Lowe's
(843) 234-6033
2301 Highway 501 East
Conway, SC
Hours
M-SA 6 am - 10 pm
SU 8 am - 8 pm

Mall Of South Carolina
(843) 443-6500
1200 Coastal Grand Circle
Myrtle Beach, SC
Store Hours
Sears Stores
Store Type
Sears Stores
Hours
Mon:10-21
Tue:10-21
Wed:10-21
Thu:10-21
Fri:10-21
Sat:9-21
Sun:12-18
Store Features
Mon:10-21
Tue:10-21
Wed:10-21
Thu:10-21
Fri:10-21
Sat:9-21
Sun:12-18

ABC Supply Co.,Inc/Myrtle Beach
843-626-4663
441 ABC Drive Myrtle Beach, SC, 29577
Myrtle Beach, SC
 

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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