Posts tagged: equipment

Jun 21 2011

New resin storage (at last)

I’ve been holding off buying more casting supplies, because I was in dire need of a better way of storing them. The old fridge-freezer I’d been using was simply too small, and particularly in this damp weather I want somewhere dry and warm to be able to store the supplies where they’ll last longer.

Two weeks ago I managed to grab a large commercial display fridge off ebay, and after a lot of problems with the local garage and our van we managed to collect it.

Well actually we got within 0.7miles of collecting it before the van fuel-pump failed (which we’d repeatedly asked the garage to check, but they knew best & instead changed the distributor cap & leads. Not going back there now.). Thankfully the seller brought it down to our van in their car, so we got to get towed home with it in the back.

Today I finally managed to get it moved into the workshop.

It’s a big square insulated box. The glass door is a small concern, but I suppose it’ll get me to keep the place tidier.

I got the wiring tidied up and moved around. The refrigeration still works, and I’ll be seeing if it’s possible to use it as a dehumidifier. As you can see in the quick cameraphone pic, the oil-filled radiaitor currently takes up a lot of space, so I’ll be seeing it I can improve that, possibly by changing it for a filament heater (though I’m concerned about fire risk). Will be adding a couple of fixed temperature sensors at some point to trigger the fan and try and keep the temp evenly distributed.

There’s a hole at the top that also needs plugging, where the neon lamp used to be. Silly bit of design, but easier enough to work around.

Tomorrow I start work on moving everything I shifted to the other side of the workshop back again, so I can actually use the place and get on with the current orders.

May 28 2010

Back to casting

So back to casting again, now the mini degasser’s working (and working well at that!).

Success in casting the hemispheres in water-clear styrene!
Last night I carefully trimmed the silicone moulds back to make the walls very thin, so they were drawn in with the surface tension as the styrene shrinks. This meant no streaks anymore, and there doesn’t seem to be any noticeable distortion of the shape.

The biggest problem us then actually getting the styrene out of the tin, especially in small amounts. It’s provided in a paint-tin, so unless you’re using the whole lot in one, you need a way to extract small amounts, and a plastic mixing cup is too big to fit in. So today I quickly brazed together mini ladle out of the stainless lid from a cocktail shaker and a long bolt with a couple of nuts for grip.
I’m keeping it in a glass jar, since I only have one sort of styrene to use, and apparently it’s not hygroscopic like the PU resins are. So this’ll keep it from needing repeated cleaning.

Colour mixing
Tonight I finally got a really rich chocolate colour for the only remaining casting order from before Confuzzled. “What would a melted KitKat look like?” was a good visual guide.

10pts Green, 4pts Red, 1pt Black

The resin claws and footpads are setting overnight. As tomorrow is MCM Expo and I don’t know what time I’ll get home, casting will probably resume on sunday.

I’ve been making enquiries into new variations on the standard UKFur design shirts. I’ll be getting a few “4XL” in in the unisex. Technically they’re still 3XL, but of a shirt type where it corresponds to a 54/56″ chest rather than a 50/52″.

Also been gaining interest in getting some shirts in fitted ladies sizes. Currently looking at getting some in standard black.. but also pink. And other colours too, of course!

Oddly enough, this one is a heavier weight of cotton than the one I was previously looking at, but much more affordable, and should put the ladies shirts at £12 in whatever colour.

As the next LondonFurs meet is only a week away, I’ll likely make the next order after that (as I may need the extra cash I’ll hopefully earn there, to make this increasingly large order).

[20/06/2010: Amalgamating old posts from “Dreamwidth Creative Blog” into to re-purpose DW blog account.]

May 27 2010

New MkIII benchtop degasser

So I’ve finally managed to get some bits together and assemble the new smaller degasser.

I used the fire extinguisher from the MkI degasser, which I cut shorter. Sadly it’d been out in the rain, as well as having been used for degassing previously.
Even sanding it heavily obviously didn’t remove all the traces. I used a nice zinc primer on the inside which seemed to take, but once I went over it with white enamel it refused to bond where the resins had previously splashed.
Next time I’ll fork out for some Hammerite. I’m not even sure this enamel will survive cleaning any spatter off the inside later.

Found that Poundland is doing rather large tubes of two-part epoxy! Handy stuff to have around. Especially for £6 cheaper than Araldite. It does reek of fish before it sets though.
The 99p Shop nearby provided a cheap frying pan which got cut up into the lid surround. Fitted so tightly there was no need for a retaining pipe-clip strap.

I brazed a load spreader to the UTA manifold, and glued it on. The nossle holder of the extinguishers base perfectly holds the up-to-air filter so it’s a ready-made support. Without it I’d be worried about the lever-handled ball-valve dislodged the manifold after only a few uses.

Made a proper handle from some curved extruded aluminium and some bolts. Again, glued onto 10mm polycarbonate cut to size. I’m unsure if it’ll need internal lighting yet. The white inside reflects a lot of ambient light and it’s not as deep. Will see.

So I now have a nice small degasser for using on the workbench! Both controls are nice easy to use lever-handled ball valves. I should be able to leave the pump running to the catchpot and simply switch the two valves for fast control.
It should make the degassing of the resins prior to pouring them far simpler. And if one is sealed under a static vacuum, the other chamber can be used under pumped vacuum.

One thing to note is that it looks messy because the Poundland 131 epoxy is thinner and slower-setting than Araldite. But if it works, it works, and it seems just as strong when set.

As another improvement to the system I also mounted up the MkII chamber, pump and catchpot to a plank of wood. It reduces the footprint a bit but mostly stops them from moving around in use and flexing the pipes which can result in leaks or manifolds breaking.

Will try to get a short demo video up on youtube.

[20/06/2010: Amalgamating old posts from “Dreamwidth Creative Blog” into to re-purpose DW blog account.]

Mar 11 2010

Vacuum de-gasser progress/update

Just a little something recorded with the new digital camera. The one that you get the video off via USB.

[20/06/2010: Amalgamating old posts from “Dreamwidth Creative Blog” into to re-purpose DW blog account.]

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