Building an Interior Door: Part One – The Frame
Full size home doors are a project we can all find a place for, but they can be intimidating.
There’s a lot of lumber, and a lot of weight, plus they’re a little bigger scale than what we typically work on. But they’re really nothing more than oversized cabinet doors. I show you step by step how I make interior home doors. (Photo left: The completed project – Ready to by fitted with a lock and hung by the trim carpenter. Click to enlarge image.)
This is a contemporary door, which was built based on a sketch provided by the client. The door is hard maple, finished with a wipe on varnish. The client took an integral part in choosing lumber and it’s location in the door.
Clamps, Clamps, and More Clamps
Interior doors are usually 1 3/8″ thick. I build mine by laminating two pieces of 3/4″ thick stock. This yeilds a stronger, more stable door frame, which has less tendencey to warp or distort over time. I usually do these lamination clamp ups in a vacuum press. But they can be done with regular clamps too (Provided you have enough!)
Old School Jointing
I own a 6″ jointer, but the rails on this door are 8″. The solution: Pull out the hand planes and flatten one side, then run the piece through the planer to bring it to final thickness. Pencil scribbles on the workpiece help show the low spots. The plane is a standard #5 Bailey, with a corrogated sole.
A Groove holds the panel
After putting my stack dado in the table saw, I cut a groove for the door’s panel to float in. The groove is a hair wider than 3/4″, and 1/2″ deep. It will hold the panel, but still allow it to expand and contract across its width. Ensure the groove is centered in the pieces by flipping them around and running a second pass over the dado blade.
The start of a curve
The rails and stiles have a mild curved profile detail. I begin making that curve by cutting a low angle chamfer on the tablesaw. I’ll finish it with hand planes and sand paper
Trim away the profile
When ever you veer away from cope and stick bit sets (either router or shaper mounted), you have to revert to joinery based on old world techniques. The profile on the door’s rails and stiles needs to be mitered, and the remainder removed where the stile and rail meets. A trim router with a flush trim bit makes quick work of the process
Big work piece, little miter
The profile on the rail is mitered on the table saw. It’s an 8″ high rail, so I added an auxilliary fence to my miter guage for additional support. This photo was taken on from the outfeed side of the saw.
Matching miter is cut by hand
The miter on the stile could be cut on the tablesaw, but the stile is over 80″ long. For me, it’s easier, quicker, and safer to cut the matching miter with hand tools. The process has one basic rule to remember: You can always remove more, but you can’t put wood back. The chisel is a basic, off the shelf, Sears Craftsman. There are nicer chisels out there, but this one gets the job done.
Fit’s like a glove
I occasional match the rail to the stile, to see how my hand tool work is progressing. The goal is a nice tight mitered joint, like this one. Now just 3 more to go!
I love loose tennons!
I set my router up with a couple of fences, and a 3/4″ diameter bit to cut the mortises for the loose tennons. I’ll cut two mortises, 1 1/2″ deep by 2 1/2″ long. This door is solid rock maple, and we don’t want to skimp on joinery to support that weight. Just a note, the ouside fence is the scrap cut off from when I sized the rails to length.
Matching Mortises in the stiles
a couple of matching mortises are cut in to the stiles. The profile intereferes with the router base on the inner mortise. I cut as much of it as I can with the router, and finish it up by hand.
A note about the well worn workbench – It’s 4 layers of 3/4″ MDF laminated togeather, and covered with plastic laminate. It’s tough, stable, and VERY heavy. This one’s about 10 years old, and I’m thinking of replacing it sometime this year. I’m thinking about making an European style joiner’s bench, like Frank Klausz uses – Of course, mine will have to be made from Quartersawn white oak!
With the joinery cut, I do a test fit to check for any gaps or touch ups that need to be made. A couple of 3/4″ thick spacers placed in the panel groove help to keep things oriented properly. I use chalk to mark my pieces, and keep track of things. Chalk doesn’t marr the surface, and comes off easy
Successful Dry Fit!
The door frame is complete, and the dryfit a sucess! I’m using a couple of Bessey Tradesman clamps to hold things durring the dryfit – Notice how much they’ve bowed? I’ll switch to heavier clamps for the real glue up! I leave the stiles long until the door has been glued up – They make nice “feet” to keep the good parts of the door off the floor.
In the second part of this blog, I’ll cover building the panel and completing the door.