Don't you hate it when it does that?
Hehehe… I was flycutting a thin plastic wedge for a spacer on Saturday(the day before Sunday this time) Plastic stock was superglued to a piece of aluminium which is a handy way to hold thin plastic stock. I was rushing things along and being hot day already it didn’t take much for the plastic to warm up just enough for the glue to let go… guess why they call it fly cutting??
I do know why it is called fly cutting! I also know a surface grinder makes a great launch pad.
Not quite the destructive type of melting but I thought you'd get a kick out of it!
Another +1 Lyndon!
I’ll try take some pictures on Saturday(the day before Sunday) and post them up. Just basic 3/4” pipe burners with a 1.5” adapter fitting on the inlet with a bracket welded on the side to hold the injector in the mouth. The airflow control was planned to be a sliding gate across the inlet. Since the injector is essentially 10mm all-thread drill out with a MIG tip in the end, I’m making a large washer out of 1/4“ plate threaded to match the all-thread to give you very fine adjustment. My brackets are too short though so they will be ground off and new ones made to suit the purpose re-using the all-thread injector part.
Yep… drifting. Was hoping to employ the aid my hydraulic press a little bit. Both getting the drift in and then trying to get it back out.
Years ago we used a drift to wedge an 8" OD Inconel 800 tube out to match 8-5/8" OD pipe. With a 100 ton jack. Took four guys with rosebuds to get it hot enough to move. It's easier to get it out, just tap around and around and it will come out.
Much easier to get it red and tap around on it over a mandrel. You can't keep it from flaring. By the way, you know "don't force it, get a bigger hammer"? Lots of guys think that's a joke. But if you visualize a 4" diameter steel bar 4 ft long on a bench, you can peen the end over with a two pound hammer and never move it. But a 16 pound sledge will bump it right along and never damage the end.
One question though… does that area where you have the pressure gauge fitted not get very hot over time? I have some very nice needle valves but they have plastic stem glands and plastic knobs so have to be a little carful of transmitted heat. Hard finding them as they don’t sell gas fittings like that to public here.
I'm not worried, it has a cooling stream of both air and cold propane cooling it. I only run mine about 45 minutes but the tube never got above 80F AFTER the air holes. The thermal connection across the ligaments at the air holes is nicely cooled by the air stream. Just not a problem. A longer mixing tube also does not hurt. The only issue would be thermal radiation from the furnace and if you design the furnace to get hot you should be keeping the radiation down.
Composites… carbon, kevlar, fibreglass, dyneema etc. construction along with all the different resins. I would include FRP/GRP and other plastics like elastomer and rubber into the mix too. You can throw in core materials like all the foams, plastics, honeycomb and of course a lot of woodwork. Then there is all the mould making and the coatings…
Duh! I knew that. At least at one time.
CNC router… Oh YES you do!!! Not so much a language as some software that will work along with whatever controller it uses. Mach3 and LinuxCNC is quite popular. I’ve been playing with Autodesk Fusion360 for the very reason as it is free for personal use, great 3D modelling and very useful post processing features. Idea is to start small using GRBL with Ardiuno microcontroller and step up to a proper LinuxCNC with a breakout board as funds permit.
I was using Mach3 on a dedicated computer bought for the purpose. The controller plugs directly into a parallel port. I need some consulting when I get my CNC router back. I'll just drop in on your thread.
I actually have some fine bentonite that I use to make a refractory coating along with silica but not enough to make a good batch of green sand. Just found a new local supplier that sells industrial green sand by the 30kg bag and it is cheaper than the little bag of bentonite I sourced from a pottery supplier.