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Tool Talk: Forstner Bits Prescott AZ

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
(928)771-8467
1941 E Highway 69
Prescott, AZ
Hours
Mon-Sat: 6:00am-9:00pm
Sun: 7:00am-8:00pm

Gateway Mall
(928) 777-7700
3400 Gateway Blvd
Prescott, AZ
Store Hours
Sears Stores
Store Type
Sears Stores
Hours
Mon:10-20
Tue:10-20
Wed:10-20
Thu:10-20
Fri:10-21
Sat:10-21
Sun:11-18
Store Features
Mon:10-20
Tue:10-20
Wed:10-20
Thu:10-20
Fri:10-21
Sat:10-21
Sun:11-18

Foxworth Galbraith- Prescott
928-445-2525
430 North 6th Street Prescott, AZ, 86301
Prescott, AZ
 
Prescott Valley Ace Hardware
(928) 772-8111
7211 E 1st St
Prescott Valley, AZ
 
Arizona General Ace Hardware
(928) 636-4401
1395 S Hwy 89-
Chino Valley, AZ
 
The Home Depot
(928)777-2400
5500 E State Route 69
Prescott Valley, AZ
Hours
Mon-Sat: 6:00am-9:00pm
Sun: 7:00am-8:00pm

Lowe's
(928) 541-8640
2300 East State Route 69
Prescott, AZ
Hours
M-SA 6 am - 9 pm
SU 8 am - 8 pm

Fastenal- Prescott Valley
928-772-6325
9551 E. Lorna Lane, Suite E/F Prescott Valley, AZ, 86314
Prescott Valley, AZ
 
Kmart 4880 / Cross Merch
(928) 772-0017
7550 E State Hwy 69
Prescott Vall, AZ
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

Hunt's Do it Best Lumber
(928) 636-2333
1204 N Hwy 89
Chino Valley, AZ
 

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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