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Router Bits for the D4 and the D4R Through Dovetail Bit Selection To match the angle cast into every guide finger, all through dovetails are cut on the D4R using 8º dovetail bits for tails and one of three straight bits for pins. The dovetail bit's working depth (carbide height) must be at least equal to or slightly greater than the thickness of your pin board (column B in the chart below). Choose the smallest dovetail bit you can (column A) to cut sockets for pins as narrow as possible for a look of hand-cut elegance. Use the template guidebush and straight bit indicated in the chart. A 1/2", 8 dovetail bit (No.80) and a 5/16" straight bit (No.140) are the workhorses used for work up to 13/16" thick. Both bits are standard equipment with the Leigh D4R jig. They are used with a 7/16" o.d. template guidebush, the choice for all bits with 1/4" or 8mm shanks. High Quality Bits Leigh Carbide tipped router bits are among the best you can buy. Our carbide comes from Sandvik of Sweden, the world leading carbide manufacturer. Each bit is honed with 600 grit diamond wheels for superbly smooth, efficient cutting. Shanks are all 1-3/4" long to handle the thickness of the finger assembly. All Leigh bits are manufactured to ISO 9002 standards. Shank Selection Leigh highly recommends the use of bits with 8mm shanks (designated by -8 appended to Leigh bit numbers) in place of ordinary 1/4" shanks. The 8mm shanks, which have become the norm outside North America, fit easily within the inside diameter of 7/16" o.d. template guidebushes. They are considerably stronger and stiffer than 1/4" shanks, allowing smoother cuts and faster feed rates with a better margin of safety. Some router manufacturers offer inexpensive 8mm collets to fit their routers. Other routers with 1/2" collets, will accept Leigh's No.172-8 1/2" to 8mm collet reducer. 
*Please note that dimension B is not the cutting depth of the carbide. All Leigh cutters have slightly more carbide cutting
depth than is required.
**Cutters No. 80-8, 120-8 and 140-8 are standard equipment with the Leigh D4R Dovetail Jig. Half-Blind Dovetail Bit Selection In half-blind joints, both pins and tails are cut with the same dovetail bit. The bit angle determines the nominal depth of cut, therefore, a bit of a given angle must cut at or very near a specific depth in order to make pins and tails fit together properly. For instance, the 1/2" 8 dovetail bit that comes with the D4R jig must cut to a depth of 3/4". You cannot use this bit to cut half-blind dovetails in pin board (drawer front) stock less than 7/8" thick. To work with 3/4" or thinner drawer fronts, choose a bit with a cutting depth at least 1/8" less than the thickness of the drawer front. For rabbeted or lipped drawers, choose a bit with a cutting depth slightly less than the rabbet's shoulder depth. Each of the dovetail bits below is available in a 1/4" or stronger 8mm shank.
*Please note that dimension B is not the cutting depth of the carbide. All Leigh cutters have slightly more carbide cutting depth than is required. **Cutters No. 80-8, 120-8 and 140-8 are standard equipment with the Leigh D4R Dovetail Jig. Boxed Leigh Bit Sets for the D4 and D4R Dovetail Jig Complete sets in your choice of 1/4" or 8mm shank bits 
Leigh's 14-piece No. 5116 bit set includes every 1/4" and 1/2" shank bit used with today's D4R jig and all earlier models. That's every bit shown on these two pages! The boxed set includes Leigh bit No.s 50, 60, 70, 75, 80, 90, 100, 101, 112, 120, 128, 140, 150 and 160
Item 5116 SAVE US $45/ CDN $66 over individual bit prices* ......$169.00 USD  No. 5116-8 16-piece bit set includes two 1/2" to 8mm collet adaptors in addition to every 8mm and 1/2" shank bit used with the D4R. The extra strength and stiffness of 8mm shanks makes this bit collection ideal for high-volume professional work and for those who work in hard wood. It's our most popular set. The boxed set includes Leigh bit No.s 50-8, 60-8, 70-8, 75-8, 80-8, 90, 100, 101-8, 112-8, 120-8, 128-8, 140-8, 150 and 160. Item 5116-8 SAVE US $47 / CDN $70 over individual bit prices* ......$179.00 USD Item 2411 11 pc. Bit Set ...... $139.00 USD 11 pc. 1/4" shank bit set for all D Series dovetail jigs. Set includes bit numbers: 50,60,70,75,90,100,150,160,101, 112 and 128 Item 2411-8 12 pc. Bit Set ...... $139.00 USD 12 pc. 8mm shank bit set for all D Series dovetail jigs. Set includes bit numbers: 50-8, 60-8, 70-8, 75-8, 90, 100, 150, 160, 101-8, 112-8 and 128-8 PLUS a 172-8 1/2" to 8mm collet reducer. Item 1607 7 pc. Bit Set ...... $89.00 USD 7 pc. 1/4" shank bit set for all D Series dovetail jigs. Set includes cutter #s 50, 60, 70, 75, 101, 112 and 128 Item 1607-8 7 pc. Bit Set ...... $89.00 USD 7 pc. 8mm shank bit set with box (Includes cutter #s 50-8, 60-8, 70-8, 75-8, 101-8, 112-8, 128-8) *and you get the box as well!
All 1/4 and 8mm shank cutters require 7/16" TGB All 1/2 shank cutters require 5/8" TGB
Click here to view our shipping rates. |
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Item 172-8 One 1/2" to 8mm collet reducer 1 1/4" long....$6.00 USD 