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  • r01walker commented on andrewwilson's instructable Emergency Stop Button 2 years ago
    Emergency Stop Button

    first great job. had not actually gone their mentally. my major modification or suggestion is use a 4in square box knock out a hole in the back. use a step drill to open the hole. but it has a 1/2 and 3/4 conduit knock out in the back. if you need extra room put a expansion box on it put a blank cover on the bottom and use 2 1/2 romex screw type connectors to hold the wire. it would be more sturdy in regards to adrenalin powered oops estop smacks. anyways good idea.

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  • r01walker commented on DIY Dave's instructable AC Arc Welder FAIL3 years ago
    AC Arc Welder FAIL

    further their is a duty rating on welders. the box has no ventilation. was the box real hot? i had a harbor freight welder with a 9% duty cycle. a couple of 9 inch 110v fans i put on the transformer to increase the duty cycle.

    um no facts. on small low power welders it sometimes takes a minute to get them to arc. lots of sticking. by the rod sticking you had power. a fuse would have saved the transformers. without a volt amp measurements the rest is conjecture. if you game rebuild and be somewhat conservative in your tests. if the turns are backwards, or the two transformers are wired backwards. could mean a world of difference in functionality.

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  • Make a 3D Scanner From a Cell Phone and Bicycle Wheel

    will do. be a while but i will post.

    cant hurt. im working on a radically morphed machine biased on your original concept. the main issue is stability. i dont disrespect. but respect. this, with more rigidity and motorized could be a high def image scanner. motorize the camera. to move on a curved track. put a hard drive on the cellphone with a power supply. drivers and cable for the cellphone. rotate the wheel lets say 360 times, and move the camera lets say 1 inch and repeat. merge the images. ardunio to control the motors and the shutter. lighting could be rgb led light strips and possibly different colors could enhance the image resolution and definition. again radical improvements. but possibly reality quality images into stl files.

    excellent. i am willing to recreate using slightly different equipment. my concern is rigidity. if a precision scan is possible it must not move except in the designed rotational plane. it must be handled during scan and that pressure is not compensated for. drop kick thought is to put skateboard roller sets around the outer wheel to support the camera mechanism. my wheel is from a salvage bicycle and is the front wheel with a 3/8-24 stud through it. the side pressure from a small weight at 12 inches out could give all kinds of torsional problems.

    cant hurt. im working on a radically morphed machine biased on your original concept. the main issue is stability. i dont disrespect. but respect. this, with more rigidity and motorized could be a high def image scanner. motorize the camera. to move on a curved track. put a hard drive on the cellphone wit a power supply. drivers and cable for the cellphone. rotate the wheel lets say 360 times, and move the camera lets say 1 inch and repeat. merge the images. ardunio to control the motors and the shutter. lighting could be 12 rgb led light strips and possibly different colors could enhance the image resolution and definition. again radical improvements. but possibly reality quality images into stl files.

    View Instructable »