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  1. rkosiorek

    Nuvinci developer kits for cheap

    wow, they took down the link from their website. not only that but, their support forum is also down. all that's left is a splash screen telling you to email support. I should have a copy of it here somewhere. i'll post back as soon as i find it. first i have to find a flash light. i know it's...
  2. rkosiorek

    Heavy Rain Malfunction

    a generous dollop of dielectric grease or even regular Vaseline on the bit of exposed leads does wonders to keep water out of the hall sensors. it is also great for sealing connectors. it may be a little messy but once it is sealed away it does not matter. rick
  3. rkosiorek

    Bottom bracket Torque sensor

    ebikes.ca sells the THUN brand BB torque sensor. rick
  4. rkosiorek

    Different purpose for motor

    mechanically it is always engaged. but electrically the power can be turned on and off. switched off, there is very little drag. but when switched on the dynamo is doing work so it needs energy put in. the higher the electrical load, the higher the mechanical load as well. with a small...
  5. rkosiorek

    Different purpose for motor

    to really impress with techie mumbo jumbo, how about proposing a dynamo that uses eddy currents at the rim an has absolutely no physical contact with the wheel. Magnic produces such a light. http://www.magniclight.com/MagnicLight/index.php/en/startseite this video may be in German but it does...
  6. rkosiorek

    Different purpose for motor

    sure you can use a motor to do that. but it is a huge energy waste using a large motor to do the work a small bicycle hub dynamo can do. Shimano and SRAM both make ones that output 6V AC @1.5W. pedaling a 300W or larger motor takes a lot more effort than a 1.5W dynamo. even without a load the...
  7. rkosiorek

    DIY Single Cell LiFePO4 Charger

    you are very correct. but i never intended these to be used completely stand alone, unattended chargers. my purpose was to be able to quickly charge up individual cells. mostly to bring up cells to a known state of charge before assembling into packs. rick
  8. rkosiorek

    If you're not into fast street cars, just skip this thread.

    I don't have the skills to drive a car at those speeds. But i did find a solution. In Germany there is is thing called a "Nurburgring Taxi" this is a copilot experience. A pro race driver will get you the ride of your life. Back in the 80's i rented a Porsche 959 for 3 amazing laps around the...
  9. rkosiorek

    Two hub motors and controllers one throttle

    Just use one of these: http://www.robotmarketplace.com/products/4QDW-DCI-111.html rick
  10. rkosiorek

    Steering multiple controllers. Help!

    4QD manufactures a multi throttle, multi controller interface board that buffers the pots. it is usually used to interface a joystick to a pair of controllers. but it can be configured to use a steer pot with a master throttle. in that configuration the steer pot will change the power to each...
  11. rkosiorek

    Build your own CD battery tab welder for about $100.00+-

    i've done a fair amount of experimenting with this and i have found that charging to a voltage is very inaccurate. what is much better is to charge the cap using a CC/CV power supply for a controlled time period. since the scr drains the cap completely when it fires the timer controls the amount...
  12. rkosiorek

    Building a triple stator axial flux motor

    Really, REALLY, KEWL!!! now just so I can be an unappreciative bastard.. How soon before you test it on a bike? The suspense is killing me. but really that is an impressive display of what can be built with skilled hands and a few simple tools. excellent craftsmanship. rick
  13. rkosiorek

    fixing a Daymak Gatto and mods

    I'm sorry. i don't have anything against you, or generally even against the scooters. as long as the scooters stay off of the bicycle/multi-use paths scaring the pedestrians. this was a rant brought on by my recent bad experiences with scooter owners. in your post you answered your first...
  14. rkosiorek

    fixing a Daymak Gatto and mods

    If you haven't guessed already i really dislike these scooters calling themselves ebikes style contraptions. mostly because it confuses people as to what an ebike is. locally there is talk about banning ebikes on the bike paths because of the buffoons ridding these scooter on bike paths...
  15. rkosiorek

    fixing a Daymak Gatto and mods

    Firstly, that is not an eBike. it is an electric scooter. period. face it those pedals are purely decorative. do you even have them attached? or do you ride without. add to the the weight of the thing and you have an underpowered scooter. a hub motor does not have any advantage over a geared...
  16. rkosiorek

    non E-bike schematic mod help required

    i skimmed right over that part about 9V dropping out. so you are probably correct that using 9V at the battery input should work with the resistor changes you calculated. with those values the cutoff should be at a battery voltage of around 5.85V. but to be on the safe side you could...
  17. rkosiorek

    Converting an SX2 Mini Mill to CNC - build thread

    weight means something but mass means much more. these are open loop stepper motors. there is no feedback mechanism or feedback loop to continuously adjust or correct any deviation from expected behavior or motion. the stepper motor is commanded to move but there is no guarantee that the table...
  18. rkosiorek

    Converting an SX2 Mini Mill to CNC - build thread

    nice job. be interesting to see if there are any issues driving the "Z" axis. gravity helps the head going down and opposes the head going up. that means that the acceleration during "Z" axis contouring will be different depending on whether you are plunging or withdrawing the tool. that could...
  19. rkosiorek

    Width for BMX rims with scooter tires?

    general rule of thumb. rim should be 2/3rds width of tire or more. rick
  20. rkosiorek

    Hidden Brake Sensor Pin Out

    big discussion on this in the technical reference section. look for something about using reed switched for brakes. explains all. rick
  21. rkosiorek

    non E-bike schematic mod help required

    the way i see it the LT1176 is used as a buck converter to guarantee 6V going into the MAX761. the Max761 is a boost type converter to step up the 6V input to the 12V required by the rest of the circuit. just plug your 9V battery into the input jack used for vehicle power. you don't need to...
  22. rkosiorek

    Hall effect sensor in throttle.

    no, you cannot use the same sensors inside of a motor. in a motor the sensor latches and is either a logic "0" or logic "1" and toggles between 0V and 5V. often the problem inside of the throttle is that the magnet comes loose and it no longer moves when the throttle is twisted. i'd pop the...
  23. rkosiorek

    Any USA expatriates here?

    wow, that site has some very scary statistics. according to them you yanks are 3X as likely to die by violence as the next closest competitor . and 9X for war. only 17 civilized countries are being compared here. no third world nations are listed. and it seems that the US leads or is close to...
  24. rkosiorek

    Cyclone controller died

    I'm tempted to scold you severely and swear up and down that no one else here has never, ever committed such an error. most especially not ME! good thing the internet is so anonymous. that means you can't actually see me trying to say that with a straight face. i usually console myself by...
  25. rkosiorek

    Nuvinci developer kits for cheap

    i would think that it would not be too difficult to adapt the regular manual shifter. an adapter could be made to attach the grip shifter to the motor. and a second one to adapt the square drive on the manual shift banjo to the spline end on the auto shift rod. this could be as simple as mixing...
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