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  • DavidD477 commented on Lftndbt's instructable Stitch Yourself Shut- Surgery at Home.4 months ago
    Stitch Yourself Shut- Surgery at Home.

    The needle should go through all three layers of skin and sit just above the fat layer. Stitching 'too deep' is only an issue if you jam the needle in somewhere you shouldn't, in which case you'll know about it. The only real problem with stitching through the fat layer and into muscle is that the stitches may be less effective at pulling the skin together. This is one of the reason professional suture needles are curved; you want to 'hook' the dermal layer on one side and then on the other then pull it together with your suture (thread), fishing line and dental floss are two good DIY alternatives to medical suture.If you can't see the fat layer on a cut (unless it's to a hand or somewhere where there is extremely little body fat) you're most likely best off using glue.

    A rat can't give consent so you run the risk of being prosecuted for animal cruelty and as well wishing as you may be, if it makes it to the papers the public will not see you in a good light.However ketamine would be the best anaesthetic agent. About 50mg intramuscular (injected into the thigh using a high gauge needle (27g or higher considering the size of an average rat) should keep a rat out for about twenty minutes. As for stitches, they're likely going to be more trouble than they're worth, try and keep the cut as straight as possible and glue it (use cyanoacrylate glue AKA super glue, do not let cyanoacrylate come into contact with cotton).

    The needle should go through all three layers of skin and sit just above the fat layer. Stitching 'too deep' is only an issue if you jam the needle in somewhere you shouldn't, in which case you'll know about it. The only real problem with stitching through the fat layer and into muscle is that the stitches may be less effective at pulling the skin together. If you can't see the fat layer on a cut (unless it's to a hand or somewhere where there is extremely little body fat) you're most likely best off using glue.

    You should have used glue. Much less invasive for a small cut like that.

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  • How to Make a Flash Bang (Flash Grenade)

    This is not a flashbang it's just a piece of burning ferrocerium. You can buy six inch rods of the stuff online instead of having to pull apart lighters, I have a few ferro rods for lighting campfires. Lighting magnesium ribbon (again, cheap and easy to get online) would have the same effect.Flash powder (you might be able to get this online, check suppliers for antique photography equipment) will have a much better effect, for the bang all you need is black powder in a tightly sealed card tube.For an actual flashbang you will need:One coke or beer can, a food can is fine tooFlash powderBlack powderCardDuct tapeClear tapeA few boxes of matchesSafety fuseCordageAssorted tools, a leatherman or swiss aemy knife will do.Using an awl punch holes in the can until it looks like it's been hit w...

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    This is not a flashbang it's just a piece of burning ferrocerium. You can buy six inch rods of the stuff online instead of having to pull apart lighters, I have a few ferro rods for lighting campfires. Lighting magnesium ribbon (again, cheap and easy to get online) would have the same effect.Flash powder (you might be able to get this online, check suppliers for antique photography equipment) will have a much better effect, for the bang all you need is black powder in a tightly sealed card tube.For an actual flashbang you will need:One coke or beer can, a food can is fine tooFlash powderBlack powderCardDuct tapeClear tapeA few boxes of matchesSafety fuseCordageAssorted tools, a leatherman or swiss aemy knife will do.Using an awl punch holes in the can until it looks like it's been hit with birdshot.Cut the top off the canMake a tube out of the card, big enough to hold about 10-20g of black powder, leave the top openCut about 5 seconds of safety fuse, cut six strands of 5 seconds of fuseCut the match boxes apart so you have the strikers availableSandwich two matches in between two striker pads along with two strands of 5s safety fuse. Do this three times.Attach the cordage to the striker pads using duct tapeFill the tube with black powder and separate the fuse from each match striker into the black powder, secure toghtly with duct tape. The tighter it's sealed, the louder the bang.Reverse duct tape around the card tube so it becomes sticky and generously apply flash powder to it, secure the other three fuses and flash powder in place with clear tape.Insert into can so it is in the middle of the can, not at the edgesTape the top onto the can with the cordage coming out the hole that the ring pull makesPulling sharply on the cordage strikes the matches (you use three in case one or two fail to ignite), which lights the fuses. You have about five seconds before it goes off. Flashbangs can cause severe burns and/or shrapnel injuries if handled/made incorrectly. Check local law before making this. Don't attempt to make your own fuse.

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  • DavidD477 commented on backbeats's instructable Make a Contact Microphone1 year ago
    Make a Contact Microphone

    Probably not since the sound is made by the tap dancer's shoes clicking off the surface, standard microphones (directional microphones with a cat's tail over it) should work better think of the surface of the floor as a percussion instrument and the shoes as drumsticks attaching one to a drum-skin wouldn't work well, but attaching it to the wooden body would. If you attached contact mics to the wall just above the floor they might work but if you want the sound re-created perfectly you're better off with conventional mics, probably two front and two rear for even sound distribution.

    Hot glue is an electrical insulator, it wouldn't work well in place of solder. A soldering iron and solder cost under £10 or approx $10, not a big expense and you'll probably find yourself mending good earphones that broke at the jack from metal fatigue, a soldering iron saved an expensive computer headset multiple times as the wire kept getting pulled when I stood up if it was caught on something; you'll find that you end up mending items that you'd usually throw out and re-purchase, usually at a much higher price than the soldering iron and solder. Some flux; even though most soldering wire is coated in a bit of flux using soldering flux means you get better connections on some metals which seem to repel solder otherwise.

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