It has been a long time of no progress on my homemade, DIY sheet metal brake. But now that the push on the interior walls is over, I have had some time to work on the project.
I have good news to report: It works!
After my Part 2 entry, I lightly tack welded the “hinges” in place. I made the hinges from three-quarter-inch diameter, three-inch long bolts with three nuts. You can see in the next photo that I used the angle grinder to grind away the I-beam to allow two of the nuts to rotate on the bolt:
Then I cut away part of the angle iron to receive the bolt on the part of the brake that swings up to bend sheet metal:
By the way, the angle iron pieces are stamped with the name “Sheffield Steel,” a foundry in business in Ohio since 1955. I got the steel from a building that was being demolished at the old U.S.Air Force, Howard Air Force Base just outside of Panama City. So I have a piece of history right here in my shop.
Next I temporarily clamped the angle iron in place and welded, little by little, the bolt and nuts in place. I kept testing to make sure that the angle iron would swing on the hinge. In the next photo is the completed hinge assembly. Also notice that I had to build a truss to keep the swinging angle iron in a straight line and to keep it from deflecting:
UPDATE JAN 2016 ~ Several people have asked for better photos of the hinge. Here are two recent photos showing how I welded the bolt head and the nuts to the brake body and the hinged part:
There has been some wear and tear on the machine in the past couple of years!
I slapped on a few coats of paint to keep the rust at bay, then took the brake out for a test drive. For the first bend, I cut a strip of 26-gauge sheet metal to make inside corner trim for Cynthia’s studio:
Here’s a video of one of the first bends; the material is thin, 26-gauge galvanized steel. I’m sure the brake will bend heavier gauge, but probably not in full eight-foot pieces.
Here is a close up of the action of the hinge:
I’m slap-a-knee darn happy with the ease of operation of the brake and the nice sharp line of the bend it makes. I know that all my welds aren’t professional quality, but hey, I’m easily bending eight-foot-long sheet metal in my shop for less than $150 in materials vs. $2,500 or more for a commercial brake. Makes me smile.
I still want to make a press brake in the space below the sheet metal brake, for bending heavy-gauge bar stock. So watch for that post any year now.
And then am I done? Well, no. Cynthia has asked if I can upgrade the cabinet that I made to hold her 1,500 watchmaker’s tins that store her vast collection of seed beads for making necklaces and other items. I made the cabinet out of wood and the termites have been having tailgate parties on each of the 48 plywood drawers.
“Could you make drawers out of sheet metal?”
“Well yes, dear, but I will need to make a box and pan attachment for the brake.”
As it stands now, my brake can bend angles in one direction only. A box and pan attachment allows for bends in two directions, as in bending an open-topped box or drawer. So it is off to the drawing board for the next part of this project.
In other news: We are seeing signs of the end of the rainy season. As we do every year, we got hammered with rain pretty hard in November. But now the tell-tale alternation between wet days and sunny days is becoming more common. Around the fifteenth of December the rain will stop as if a switch were thrown, and the Tourist Season will begin.
Why all the rain in November every year? There is a band of low pressure that circles the globe. This band moves up and down over the equator twice a year, delivering heavy rains as it passes over Panama. It is called the Inter-tropical Convergence Zone (ITCZ).
You can see the ITCZ passing over us in this recent screen shot from The Weather Channel (Panama is the little arch of land between Costa Rica to the west and Colombia to the east). The right-most orange cloud was just about over us at the time posted at the bottom of the picture:
That’s all for now. Thanks for stopping by.