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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 Pan4 months 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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