Join Date: Feb 2010
Location: Whittier, CA. USA
For Half-Blind Dovetails the total depth of your bit will be 5/8" from the base plate of your router (3/8" for the joint & 1/4" for the template = 5/8" total) this will get you very close to the sweet spot for the depth you need for the bit. The bit depth stop on the side of the jig might not be accurately set. The bit will protrude 3/8" past the bottom side of the template into your material. Once you have your sweet spot this setup will work on all thickness of material from 1/2" to 1-1/8" as the joint is referenced from the inside of the joint. I have a router that I never adjust unless changing a dull bit for a sharp one.
Your side pieces will be mounted on the front of the jig vertically & the front & rear pieces on the top of the jig. Insides facing out, outsides facing against the jig. Line them up with the line in the template.
For Half-Blind Dovetails you will machine both sides of a joint at the same time. You will do two opposite corners on one side of the jig (left side) & the other opposite two corners on the other side of the jig (right side). If you number your corners 1 thru 4 you will do 1 & 3 on one side & 2 & 4 on the other side (or ABCD = A&C - B&D).
For the narrower parts you can use a spacer of same thickness on opposite side of jig to even out clamping pressure. I cut 2 short pieces of scrap with a half-blind joint so it would not fall out when clamp was loosened. Not needed for wider parts.
For the Half-Blind dovetails the bit you should be using from your jig is a 17/32", 7° Dovetail Bit #43776PC with a 3/4" O.D. Template Guide, #42040
For centered joints (traditional half pins top & bottom) on this jig your drawer parts need to be certain sizes. This jig uses 1" increments + 1/4". Your height sizes will be for example: 2-1/4", 3-1/4", 4-1/4", 5-1/4", 6-1/4" etc. Use these guidelines for making boxes or drawers. Example: If you are making drawers & the drawer opening is 5" then you need to go down to the 4-1/4" drawer sides to fit a 5" opening with half pins top & bottom of your joint.
This drawer is 4-1/4" high in a 5" opening. It has a 1/4" bottom mounted in a dado that is 1/2" up from the bottom & is installed using under mount soft close slides. Mounting the bottom with a 1/2" recess under the drawer will hide your dado in the joint behind the bottom tail & not be seen when assembled as shown in the picture. This hides under mount slides also.
Just because you can, doesn't always mean you should!
Last edited by jlord; 08-10-2011 at 08:19 PM.