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16CommentsJoined March 11th, 2015

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  • jgh59 commented on yash yash's instructable Converting a Brushed Dc Motor Into Bldc1 month ago
    Converting a Brushed Dc Motor Into Bldc

    This isn't really a BLDC motor, you are running the motor like a stepper motor. A true BLDC motor requires shaft position sensing to energize the motor phases at the appropriate time to maximize their interaction with the motor magnets. This is normally accomplished with strategically placed Hall sensors or there is a routine in the micro controller to decode the back emf to get rotor position. There are chips out there that have this function. That said, this is pretty innovative and I particularly like how you use two motor drivers to smooth out the torque.

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  • jgh59 commented on jeroenw13's instructable Vacuum Molding Machine2 months ago
    Vacuum Molding Machine

    I got one of those for Christmas when I was in kindergarten - Christmas 1965 - what were my parents thinking? Hot, molten plastic machine for a 6 year old - no safety issues there. My older sister got a ThingMaker the same year, the one that made the rubber toys from some mystery liquid you poured in the molds. I did manage to burn myself on a ThinkMaker mold before I did any physical damage with the VacuForm; I still have the scar on my wrist. Obviously it was a really cool toy though, or I wouldn't still remember it.

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  • jgh59 commented on gun437564's instructable Constructing Perpendicular Lines5 months ago
    Constructing Perpendicular Lines

    I learned this in 4th grade geometry back in the 70's, maybe in our computer graphics driven society this is no longer common knowledge. This process also determines the mid-point of your initial line. In a similar fashion, you can bisect an angle by placing your compass anywhere along one of the lines making up the angle and striking an arc and then repeating the process on the other line so the arcs intersect. Draw the bisection line from the vertex of angle to the intersection of the arcs.On a large scale, this process can be used to layout athletic fields, like baseball diamonds and football fields allowing creation of accurate right angles. The lines are replaced by a string between two stakes. The compass is replaced by a long string with stakes on either end. You drive one ...see more »I learned this in 4th grade geometry back in the 70's, maybe in our computer graphics driven society this is no longer common knowledge. This process also determines the mid-point of your initial line. In a similar fashion, you can bisect an angle by placing your compass anywhere along one of the lines making up the angle and striking an arc and then repeating the process on the other line so the arcs intersect. Draw the bisection line from the vertex of angle to the intersection of the arcs.On a large scale, this process can be used to layout athletic fields, like baseball diamonds and football fields allowing creation of accurate right angles. The lines are replaced by a string between two stakes. The compass is replaced by a long string with stakes on either end. You drive one stake into the ground and strike your arc with the other stake and the line pulled taut.

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  • Lucas Carbide Lamp Converted to Multi Colored LED

    My father had one of these carbide lamps back in the 1950's (I'm sure it was even older) that was designed to wear on your head. He used it for coon hunting. It was dim enough that it did not frighten the coons, but bright enough to make their eyes reflect so you could see them in the trees. I'm not a hunter, but I was always fascinated by this lamp as a child; it had a little flint wheel to allow you light it.

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  • jgh59 commented on awakekiwi's instructable Solar powered electric fat chopper bike!6 months ago
    Solar powered electric fat chopper bike!

    I need to move to New Zealand - you guys are so creative, it seems as if every other Instructable I find interesting comes from somebody in New Zealand.

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  •  Generate Electricity Using Footwear-Charge Your Mobile(Piezo Generator)

    This is actually quite clever, however, I don't suggest wearing these while going through security at the airport. You may even want to avoid packing them in a checked bag!

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