Tuesday, September 6, 2011

Half Round Bed Crown

Hi, I'm back! This time I'm going to step you through a half round bed crown. This crown was a custom order, so I had to make a jig to cut the top and bottom. Since it will be covered with fabric, I will not have to paint it...wahoo!

Let's get started...

First off, I need to make a jig to get the perfect half round for the top and bottom. Cutting large circles is best performed on the band saw. Below you can see the miter gauge bar and a piece of 1/2 plywood I'm going to use for the base of the jig. I cut the dado so that the bar will fit snug, no play. Then I glue it to the base. The slot was cut using a hand saw.

The base is now set in place on the band saw. Now you can see why the slot needed to be so long. The base acts as a support for the turn table (you'll see in a minute). The band saw blade is just touching the jig base.

The view of the base as it sits in the miter gauge slot. Its a very snug fit, you don't want the jig to move.

I need to find the spot where the tooth will contact the wood. So I am using a square and a ruler to get my center line on the jig.

Here I am using the blank for the top to find the pivot hole for the turntable. I place slight pressure on the blade, since the mark on the top is offset about 1/16" from the edge. Notice there is a center line on the blank.

I align all of the center lines and mark the intersection. This should be the location for the pivot point. (I say "should" because some times thing don't go as planned.)

Its very important to use a brad point drill bit on a drill press to make the hole for the pivot point. You want to make sure you get the hole as close as humanly possible. The brad point will prevent the wood or bit to travel away from the mark.

Hmm, what was I just saying?? Well, I'll try it out, it's a little off. Maybe its time for a new pair of glasses?

For the pivot stud I used 1/8" plastic bars I had laying around. Then cut it to length after inserting it into the pivot hole. Leave a good 3/16".

I just used a sharp chisel to cut the excess off.

Here you can see the base and the turn table. The theory is if everything is centered than everything should line up. X marks the spot, basically where the two diagonals intercept marks center. I drilled the same size hole to accept the pivot point. 

And she spins!

I pin nailed the blank onto to turn table and checked the alignment. Hmm, not looking too good, what was I saying before?? The blank is set too far away from the blade.

A slight problem, but easily fixed. I drill a 3/4 hole half way into the plywood turn table and patch it with a 3/4 dowel. Why 3/4? Well, that's what I had handy. You can use any size, just as long as its bigger than the original hole.

Once the glue sets up, I plane it flush. Ready for a new hole!

I extended the setup lines and drilled another hole.

Its looking good! One side lines up!

Ahh, now that's nice, the other side lines up too! Ready to make the cut.

And here is one cut to size. Looks really good, clean edge too, no sanding required. Those are always good words to hear, no sanding!

Instead of setting up the matching part, I'll just use this one as a template. So, I mark another blank.

 I use a router with a flush trim bit and before you know it I have the top and bottom done with an extra for next time.

 I cut a groove along the back of the top and bottom with a dado blade to hold the back in place. I also test fit a nailer.

The rod supports will extend the length of the frame, so I notched out three holes for the rod supports.

The rod supports have to follow the curve of the face, so I planed a slight curve in each.

All three dry fit nicely!

To cut the blank for the face, I used a couple of 2x4's stretched  between my benches.

I use a fence that was made  for this circular saw. I just line up the fence with the line and cut.

As you can see both pieces are supported which makes for a safe and clean cut!

 I screw the top and the bottom to the back.

And I start to glue and screw the nailers.

 The nailers are 5 inches apart, I use my bendable ruler to mark the locations.

With the nailers in place, I make sure the center nailer is square.

The frame is complete...

The face is cut to size and clamped in place. I mark the screw holes, 5 inches apart!

The rod support setup...

 The center support...

Front view...

Side view...

Not a bad looking crown, needs batting and fabric and its good to go!

No comments:

Post a Comment

eXTReMe Tracker