C Clamp

Just a small Sunday project.

Here at the Uni lab we have a nice articulated lamp that lacks a base. It’s been sitting on a corner for ages so I set to make a new clamp for it.

The frame is just a bit of T beam with a nut and some square tubes welded.

For the handle I used a bit of 3/8 threaded rod and a big washer I had lying around. In order to fix it I decided to make a hole along the axis and tap it to M3. After center punching the rod I screwed it to the drill press, using a center drill to align it. The plan was foiled when I tried to drill, as I left the base loose and it moved. But it’s good enough.

My initial idea was to use another nut and a locking pin behind the front washer but that used up a loot of the available space inside the clamp. After a bit of head scratching I ground a small taper and added a small washer to push the bigger one instead of a nut. I’m quite proud of how it turned out.

Homemade C clamp
Homemade C clamp

Park bench

A while ago we were given a bunch of weathered wood from a deck. Some of us have been thinking of installing seats on the sidewalk and this looked like a good opportunity.

I looked around Core77 and there’s an entry just about seating that produced this helpful guide:

I built a simple frame with square tubing and used one of the wood packs to try it out. I need to select the best planks but it’s comfy and with a bit of paint will look good.

Assorted clamps

The last two days I finished the welds on those clamps,  built some to hold the other end of the ropes and four sturdier to screw to the roof trusses. All the screws are paired with either a nylock or two nuts locked to each other.

I painted the pieces for the bottom frame with black enamel and the ones for the roof with white to match the rest of the room. I know they’ll rust in some weeks but I left the blued surface exposed. I never tire of looking at them.

Side table iron legs

We had a nice wood slab from the kitchen remodelation and wanted to make a small table with it.

I did a quick sketch and started to build the base. I goofed a bit when cutting the intersections but it ended up fine and level on the first time anyways.

Sometimes I flunk on the easiest of the welds and others, I make a perfect one in a very hard spot. I did this one on a single pass with a bent rod and even had slag peel:

Ceiling lamp fixture: now on steel

For the last couple of weeks I worked on building a steel version of that fixture in order to hang some cable trays and a couple of other things.

After a bit of measuring I prepared all the cuts. For the sides that aren’t at a square angle I left a bit of extra material to fold over the corner. The clamps for the trays will be made with cutouts from square tubing to have a consistent size and some flat stock. I spent quite a bit of time on this phase but I’m pleased with the outcome.

For this welds I tried as much as possible to either manipulate the rod with my left hand only and sometimes with the right, but I still need a lot of practice with that. Some were awful, but others like this one are quite passable:

Lamp fixture: corner bracket, weld detail

A quick test fit and everything fell into the right place. I love it when a plan comes together.

Lamp fixture: trial fitting

Dumpster heaven

If there’s a heaven I think I visited it today.

After running a couple of errands early in the morning I headed to Lisandro Olmos on the outside of the City to buy some scrap metal for my welding classes.

A couple of members of the group said good things about Grúas Mársico so I went there, it was also a good opportunity to travel a bit on this part, as I don’t know almost anything about it.

As I entered the warehouse I became speechless. There are shelves that extend up to the roof with parts from all kind of machines neatly organized on one side. On the other pieces of metal plate and tubing. Some big planers, milling machines and spot welders among them. And on the background, the tallest pile of industrial waste I ever seen in person. All of this on sale by weight save for a couple of weird stuff.

The shop was run by a very nice lady and her brother. This morning I only bought some iron but the next time I come around I’ll bring a small truck to pick some very , very interesting stuff.

Fixing a metal chair

A while ago we bought a very nice set of chairs with a chromed base and the bog standard pneumatic height adjustment.

After a lot of use a couple of them had the welds on the base break apart. I took one home and after thinking a bit I chose to make a stiffening plate instead of just redoing the missing parts as that area looked very flimsy.

Fixing a metal chair

I traced the outline on some cardboard and then cut a bit of plate with the plasma torch.

Fixing a metal chair: stiffening plate

Some light prep and careful welding made it usable again. I tried first with a small 6013 rod but the arc wandered and blew a hole through the thin base. I had more success with 7018. The welds look horrible but are strong enough, I jumped a couple of times and it didn’t even notice.

Wrench

Sometimes I use wire cups and wheels on the grinder. Screwing them is easy but the clearance between the guard and the tool makes it very cumbersome to use an ordinary wrench to loosen them. And also they come in different sizes.

So instead of having to carry around two tools that aren’t fit I fashioned one with some flatbar. The welds are pretty enough for a beginner and this application.

After that I gently heated it over the stove to reach a lovely shade of iridescent blue:


Home made grinder wrench, heat treated

Intercom mount

We are installing an intercom system and the front door unit is meant to be mounted in a recess in the wall. But the problem is that that wall is not really suitable for making such a hole.

I cut some strips of flat stock and fashioned a box. It has a couple of tabs to bolt into the wall and another ones threaded to hold the device. This is going to be painted later but I love that blue shading.

Sliding patchbay mount

I’ve been working on and off on this for the last couple of weeks. The space we’ll have on the comms rack to handle the wiring isn’t that great and I saw on a couple of places patchbays that are articulated.

I thought on adding a twist to that and mounting everything on rails. This way I can slide it from behind the rack and then unfold it, gaining access to both sides.

We bought some pre-drilled (but not taped, ugh.) angle with the holes spaced in standard units, that was welded into a fixed frame with a couple of hinges.

This will hang from a small cart with iron wheels that rides on a couple of rails fixed to the walls.

Steel doors for rack closet

With the outer frame already built I continued with the doors. During the last couple of days I made the frames, aligned the hinges and had them welded. I also started to cut the expanded metal for the body and made a couple of simple handles.