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  • Making a Titanium Marking Knife for Woodworking

    The blue color is called alpha case. It's brittle and can induce cracks into the base metal. OK for cosmetics but keep the edges bright. It may be ecjanically removed by sanding or similar.

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  • towellm commented on fotovidx's instructable Unicorn Electro4 weeks ago
    Unicorn Electro

    Agree with ericCycles completely. Those motors have a lot of torque and the blades are intentionally sharp. Not just soft tissue injury, these could break your fingers or, worst case, catch your shirt/shorts and hold you down under the water (called an entanglement hazard). The marginal stability of the platform and the likelihood of swimmers hanging on to it multiplies the risk of an incident to near 100%.Possible ideas for safe shrouds..??...Take a look at electric assist devices for scuba divers. An improperly designed cage can present entanglement risk as well, this is not a simple design challenge. The conceptual starting point is a long tube, then modified as required.Most floating toys are anything but robust and puncture quite easily. This is quite heavy (literally, has a le...

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    Agree with ericCycles completely. Those motors have a lot of torque and the blades are intentionally sharp. Not just soft tissue injury, these could break your fingers or, worst case, catch your shirt/shorts and hold you down under the water (called an entanglement hazard). The marginal stability of the platform and the likelihood of swimmers hanging on to it multiplies the risk of an incident to near 100%.Possible ideas for safe shrouds..??...Take a look at electric assist devices for scuba divers. An improperly designed cage can present entanglement risk as well, this is not a simple design challenge. The conceptual starting point is a long tube, then modified as required.Most floating toys are anything but robust and puncture quite easily. This is quite heavy (literally, has a lead weight added). This presents another entanglement risk of an entirely different nature.On the technical, a small amount of pitch adjustment of the motor head may improve speed and controllability.

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  • Convert a Full-suspension MTB in to a Go-anywhere Ebike

    Nice rig... Although, the battery will stay hot for hours. Strategic use of copper strips could provide a significant degree of reduction. Improved margins for thermal runaway as well.

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  • D4E1 - Artmakers : Marble Painter 1.3

    A full chain guard would be a good idea. Small children will be drawn to the chain and they will wait for a moment when peoples attention is drawn away and get wrapped up on it.

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  • towellm commented on Techgenie's instructable How to Fix Any Remote at Home3 months ago
    How to Fix Any Remote at Home

    What I've seen over and over again is a small round of conductive rubber that makes contact with the PCB traces. The good thing is a red pencil eraser works on both and it's a few minute job, but that's the easy part. The challenge is getting some of these remotes open without causing considerable damage and subsequent, time consuming, filing/dressing....Many of these are "one way" assemblies, i.e. never meant to be taken apart. An instructable on the various case styles and how to get them open would be valuable.

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  • towellm commented on TizzDoggo's instructable SKY CAM an Aerial Camera Solution 3 months ago
    SKY CAM an Aerial Camera Solution

    This is a really great design, I love it..!! Consider this from an experienced engineer; Most shortcomings in a design start at the beginning, usually long before the first line is drawn.My first thought when I saw this was stability. A trolley is a very difficult platform to stabilize. Take a quick look at passenger trolleys. One possible solution is two, parallel lines. A second improvement (to reduce bounce) is avoid high tensile steel lines because they are great spings. I would suggest a rope that has a lot of internal friction, climbing rope for example. Thirdly, consider moving the main trolley motor off the trolley and onto one of the fixed points on the end. In general, the smaller the mass you have, the easier it is to dampen. Also, less mass = less tension.

    One other stabilization method, gyro's....(is that what you mean by "electronic gimbal"?)....cost unknown but you may extract some really good ones from expired aircraft instr.Also, if you can find three (you may only need one or two) small, high quality, balanced motors w/ball bearings.....you can safely run them 50-100% overspeed...possibly from old tape recorders (disable the governors)...Again, love the design....excellent job....I would be interested to know how it performs on a gusty day with a long line...

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  • Make Straight Cable Into Coiled / Pigtail Cable

    You twist it backwards and it pops inside-out...hard to explain..Best to see it done and then you'll see it's actually simple..go to: YouTube and look up "how to coil a cord"

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  • towellm commented on ariellehein's instructable Mycelial Forms6 months ago
    Mycelial Forms

    Google "mycelium growth patterns"....Nature is a great teacher.These have an interesting look but up close you begin to realize here's a lot more going on. The methods of propagation found in various bio structures has much to reveal. EX: A bee honeycomb has an interesting appearance that's crucial to it's function. How it is generated wasn't understood until fairly recently and is a wonder in itself.

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  • towellm commented on JON-A-TRON's instructable Off Grid Power Supply7 months ago
    Off Grid Power Supply

    I like the "X" handles a lot. Retailers love features like that because it captures the customers interest.I think you have an opportunity for a follow-up project: the "all weather" version...(It's a lot more than just swapping hardware and water-proofing the case, very challenging)...You may also want to do an additional upgrade project concerning cartage. That would involve choice of wheels and consideration of weights. For some applications (Ex: Beach, Camping or festival), it may involve breaking the unit into two modules (batt + elec) for further ease of cartage.One thing to note about "SLA" Sealed Lead Acid batteries. They are pressurized and do outgas to a small degree. When used with a 24/7 charger as many are, the exact voltage is very critica...

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    I like the "X" handles a lot. Retailers love features like that because it captures the customers interest.I think you have an opportunity for a follow-up project: the "all weather" version...(It's a lot more than just swapping hardware and water-proofing the case, very challenging)...You may also want to do an additional upgrade project concerning cartage. That would involve choice of wheels and consideration of weights. For some applications (Ex: Beach, Camping or festival), it may involve breaking the unit into two modules (batt + elec) for further ease of cartage.One thing to note about "SLA" Sealed Lead Acid batteries. They are pressurized and do outgas to a small degree. When used with a 24/7 charger as many are, the exact voltage is very critical to the life of the cell (and also the amount of outgassing).

    The AH capacity of a lead acid batt is actually much lower than the data plate. The reason is the greater the depth of discharge, the less life (cycles) you will get from the battery. Anything over 50% is considered a very deep and damaging discharge and this is used as the default "do not cross" line...All of this plus much more can be found at (google-"Battery University")...an excellent site that deals with all common types of batts I great detai atan engineering level...The authors are from the industry and extremely knowledgeable...

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  • towellm commented on lukeg22woo's instructable Design and Build a Tiny House7 months ago
    Design and Build a Tiny House

    Copper is at a premium and is only going to get more expensive. Running your PV system at 12 volts is quite pricey and there will be a lot of losses. 36 volts is well supported by suppliers and will reduce your costs and IR losses considerably. You want to go as high as possible, I've also seen 48 volt systems as well although I'm not sure how well supported it is for low wattage systems.

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  •  DIY CNC Router Build (large Format 5x10ft, Rack and Pinion)

    Really great work. I would only suggest one possibly important thing.For initial set-up and future wear, mechanical backlash comp for the gearsets. Software comp is not suitable for rolling slides.You should choose a pinion with as high a number of teeth as possible for wear and choose a relatively stiff spring for the comp mechanism. Large frames are quite elastic, you may also wish to add a software lash comp for high dv/dt stops and starts....the head slide plus motor is fairly heavy, frame and belt flex could be considerable...Regards,Mike - Senior AE

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  • Make Straight Cable Into Coiled / Pigtail Cable

    Last step and very important for a polished job.Turn the coil inside-out. This will put a pre-tension in the coil that will hold the coils tight against each other in the retracted position. I didn't come up with this trick myself, this is how they are actually produced.You can also heat the wire prior to wrapping it on the mandrel (you will need gloves), in some circumstances higher softening temps require an oven. For higher temps use hot sand. You need a lot of sand...i.e. a large thermal reservoir. A cooks quick read thermometer will work well. Heat the sand in an oven and let it stabilize (this may take a fairly long time), remove from the oven and immerse the wire in the sand, install your thermometer in contact with the wire/sand, cover and wait. If it's a large cross secti...

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    Last step and very important for a polished job.Turn the coil inside-out. This will put a pre-tension in the coil that will hold the coils tight against each other in the retracted position. I didn't come up with this trick myself, this is how they are actually produced.You can also heat the wire prior to wrapping it on the mandrel (you will need gloves), in some circumstances higher softening temps require an oven. For higher temps use hot sand. You need a lot of sand...i.e. a large thermal reservoir. A cooks quick read thermometer will work well. Heat the sand in an oven and let it stabilize (this may take a fairly long time), remove from the oven and immerse the wire in the sand, install your thermometer in contact with the wire/sand, cover and wait. If it's a large cross section, turn the oven down or off and put the wire/sand back in. Do not put the wire in cold sand and try to heat it, you will make a "mess".

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  • towellm commented on a-morpheus's instructable Undead Pan1 year ago
    Undead Pan

    Make sure you get 100% pure "raw linseed oil" which is in fact "flaxseed oil". The version sold for painting (typical at Lowes, Home Depot....etc) has additives and is toxic....

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  • Ultimate Night Vision Headlamp - 500+ Lumens With Only 8 Watts

    The moon looks as it does for many reasons but primarily Rayleigh Scattering. The lamp is great because of his research into the human eye and will make this post timeless. If you look a little deeper, you'll see why most white LED's (without corrections) are a very poor source of visible light because of refractive image splitting on the retina and also the biology of the rods/cones taken together plotted against the frequensies of these devices.

    You bring about an interesting point wrt to this headlamp. Low light vision is further broken down into Scotopic and Mesopic (basically: low and lower). If you look these up and esp the wavelengths associated with each, certain colors will be more pronounced than others depending on light level (LUX). I believe a three color headlamp (LED's come in 5nm steps), each dimmable, would allow adjustment to the specific environment (colors) and LUX levels you are witnessing. The ideal ranges might be 495-500nm, 500-505nm and 505-510nm.

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