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Strong, Perfect Lock Miter Joints Sebring FL

When correctly cut, the parts go together at a perfect 90-degree angle and the interlocking tongues and grooves make for lots of mechanical strength and glue surface area. Lock miters are also great at keeping parts aligned during assembly.

The Home Depot
(863)471-6119
2303 US Hwy 27 N
Sebring, FL
Hours
Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

W & W Lumber of Lake Placid
(863) 471-6055
2512 Desoto Rd
Sebring, FL
 
Lakeshore Mall
(863) 386-5700
901 Us 27 N Ste 130
Sebring, FL
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:10-21
Sun:12-18
Store Features
Mon:10-21
Tue:10-21
Wed:10-21
Thu:10-21
Fri:10-21
Sat:10-21
Sun:12-18

Kmart 4715 / Cross Merch
(863) 471-2266
901 Us-27 N Suite 100
Sebring, FL
Store Hours
Miscellaneous
Store Type
Miscellaneous
Hours
Monday To Friday Working Hours is :0-0 and for Sat:0-0
Sun:0-0
Store Features
Monday To Friday Working Hours is :0-0 and for Sat:0-0
Sun:0-0

W & W Lbr/Lake Placid Inc
(863) 465-3331
1001 U S 27 South
Lake Placid, FL
 
Fastenal- Sebring
863-385-8656
4437 US Hwy 27 S Sebring, FL, 33870
Sebring, FL
 
Lowe's of Sebring, FL
863-451-4000
2050 US 27 North Sebring, FL, 33870
Sebring, FL
 
Lowe's
(863) 451-4000
2050 Us 27 North
Sebring, FL
Hours
M-FRI 6 am - 9 pm
SA 7 am - 9 pm
SU 8 am - 8 pm

Palmer Ace Hardware
(863) 453-6688
415 W Main St
Avon Park, FL
 
Lake Placid Do it Best Hdwe
(863) 465-1999
190 Plaza Ave
Lake Placid, FL
 

Strong, Perfect Lock Miter Joints

Strong, Perfect Lock Miter Joints

 

Lock miters are strong, attractive joints that make assembly easy. So why the heck don't we use lock miters more? I think it's because they can be a pain to set up. Well, no more excuses. Here's a clever technique, sent to us by Jim Rodgers of Martinez, California. Give it a try and you may become a lock miter enthusiast.

What's Lock Miter?
A lock miter router bit cuts a 45-degree miter with a tongue and groove. When correctly cut, the parts go together at a perfect 90-degree angle and the interlocking tongues and grooves make for lots of mechanical strength and glue surface area. Lock miters are also great at keeping parts aligned during assembly. Use this joint on drawers, boxes or even hollow columns like newel posts.You can cut a lock miter on end grain, as shown in our photos, or on the long grain. Almost anyplace you'd use a miter, you can successfully use a lock miter.

The Tooling Up
Lock miter bits come in a range of sizes. The size you use depends on the thicknesses of your wood. Even the smallest lock miter bit makes a substantial cut, so I prefer bits with a 1/2-in. shank. They're more stable and result in smoother cuts. Expect to pay $50 to $100 for a bit, depending on the size. Note: The maximum size lock miter bit you can run in a 1-1/2-hp router is the 2-in. diameter. Larger bits must be run in a 2-hp or higher machine. It is essential that you run these massive cutters at the right speed—about 10,000 rpm. Your router must have variable speeds so you can slow down for these big cutters.

The Perfect Set-Up
Follow the sequence shown in Photos 1 through 7 to produce perfect lock miters on your router table. Remember to have on hand the material required for your project plus six test pieces. It's critical that the test pieces be the same thickness as the project pieces because the bit set up is specific to the thickness of your material. As you get more familiar with the set up procedure you'll need fewer test pieces.

Fig. A layout
First, center the bit on the material

PHOTO 1:
Center the bit on your workpiece by eye. Be sure your router is unplugged.

 PHOTO 2:
Adjust the router table fence by eye to its approximate position. Three points must be aligned. The top of the workpiece, the face of the fence and the 45-degree angle of the cutter ( Fig. B ). This is just a preliminary set up. You'll perfect the fence position later.

PHOTO 3:
Test the height of the router bit by cutting two test pieces. Hold each piece flat on the router table.

 PHOTO 4:
Assemble the test pieces. When the cutter is perfectly centered, the faces of the two pieces will be aligned. Adjust the bit as needed. You must have the bit centered on the material before you start working on the fence position.

Now, set the fence position.

PHOTO 5:

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