smells of bikes@smellsofbikes@mastodon.social
I've heard conservative friends openly fantasizing about a community coming together spontaneously to push back against federal tyranny.
I wonder how this feels.
smells of bikes@smellsofbikes@mastodon.social
electron rancher, bicycle medic. Colorado. Ex-G+ user. Femtoinfluencer. I build stuff and ride bikes. ε°γζ₯ζ¬θͺγθ©±γγΎγγ
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smells of bikes@smellsofbikes@mastodon.social
smells of bikes@smellsofbikes@mastodon.social
Challenge: why is the data I'm sending, blue/yellow, different than the white reference waveform, when it's the same data going through two different software packages. Also this would be so much easier with a logic analyzer than doing it all on a scope.
smells of bikes@smellsofbikes@mastodon.social
It's difficult to start cleaning up a casting because nothing is flat and you have to make something flat to start. This one is good side to side but is slightly tilted front to back with my current fixture so I guess I need to put it in a tilting vise and tram that out.
smells of bikes@smellsofbikes@mastodon.social
I remade a heddle and beater hook because the previous one broke and I lost the files I used to create it. #freecad does make this easy. Import a photo of the broken one along with a distance reference, click on the image in the object tree, and hit the calibrate button, and it'll resize based on points you choose and then tracing is easy. But I put it on printables this time. PLA, 1mm thick.
smells of bikes@smellsofbikes@mastodon.social
This came to mind after dinner tonight.
smells of bikes@smellsofbikes@mastodon.social
One mold had a blowout and lost about 300ml of aluminum out the bottom into the sand but both filled well. I have not finished cleaning them yet so the inner passages are still full of investment.
The tapered helical spiral sprue and pouring basin worked really well. It choked and remained full the whole pour, not entraining any air. That was the main point of this. There was some grubby stuff in the pour visible in one mounting boss and one lip of the intake didn't fill entirely. Still ok.
smells of bikes@smellsofbikes@mastodon.social
Here's a video of one intake cut loose from the gate system and the other as cleaned up but still gated to show how the gating worked. I'm very happy with this.
I do have to figure out how to make the gating easier to remove. Long flat contact is really frustrating to cut loose.
smells of bikes@smellsofbikes@mastodon.social
As I said once it's hot things happen quickly so I didn't take a pic of dumping in boric acid or the actual pour. I'm very busy right then. But I did get both molds filled and dumped the excess (I melt way more than needed in case I miss the pour basin and waste some) into a muffin tin. The aluminum is still very molten here so it has a mirror reflection aside from a bit of dross.
smells of bikes@smellsofbikes@mastodon.social
One mold had a blowout and lost about 300ml of aluminum out the bottom into the sand but both filled well. I have not finished cleaning them yet so the inner passages are still full of investment.
The tapered helical spiral sprue and pouring basin worked really well. It choked and remained full the whole pour, not entraining any air. That was the main point of this. There was some grubby stuff in the pour visible in one mounting boss and one lip of the intake didn't fill entirely. Still ok.
smells of bikes@smellsofbikes@mastodon.social
It takes about 15 minutes for any aluminum to melt because the heat transfer is just radiant. Once some is melted and touching the crucible side conformally, heat transfer skyrockets and everything starts happening quickly. I put the two investment molds in greensand. One mold had a crack so I put weights on it so it wouldn't float during the pour. I got to try out my diy carbon tip thermocouple thermometer for the first time.
smells of bikes@smellsofbikes@mastodon.social
As I said once it's hot things happen quickly so I didn't take a pic of dumping in boric acid or the actual pour. I'm very busy right then. But I did get both molds filled and dumped the excess (I melt way more than needed in case I miss the pour basin and waste some) into a muffin tin. The aluminum is still very molten here so it has a mirror reflection aside from a bit of dross.
smells of bikes@smellsofbikes@mastodon.social
So I trundled out the foundry furnace, set up the propane, and put the crucible in. Sometimes it's hard to get this homemade burner to fire. It needs a diverging cone at the end to hold the flame better. Plus I had low gas pressure because the propane was approximately freezing. But it did start.
smells of bikes@smellsofbikes@mastodon.social
It takes about 15 minutes for any aluminum to melt because the heat transfer is just radiant. Once some is melted and touching the crucible side conformally, heat transfer skyrockets and everything starts happening quickly. I put the two investment molds in greensand. One mold had a crack so I put weights on it so it wouldn't float during the pour. I got to try out my diy carbon tip thermocouple thermometer for the first time.
smells of bikes@smellsofbikes@mastodon.social
It snowed last night but we had a cloudless sky so it was obviously going to melt and then I'd have slightly wet ground and cold air, about the best conditions for possibly starting a brush fire.
smells of bikes@smellsofbikes@mastodon.social
So I trundled out the foundry furnace, set up the propane, and put the crucible in. Sometimes it's hard to get this homemade burner to fire. It needs a diverging cone at the end to hold the flame better. Plus I had low gas pressure because the propane was approximately freezing. But it did start.