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  1. T

    Where to get bushings/pivot for building rear suspension?

    You could use heim joints. Or as an alternative to plastic bushing, I'd use oil impregnated bronze bushings.
  2. T

    Etek Project: Bike to Trike

    Ditch the spring and put a threaded adapter on the end with a plug. Then just tighten the plug to squeeze the cells together. Also, its better to parallel first, then series. (keeps more cells in ballance.)
  3. T

    Noob's Battery Price Comparison Summary For Noobs

    Bosch 36V packs are going for about $75 a pack on ebay. That works out to be ~$0.87/Wh (2.4Ah each). Also, dewalt packs are really only 33V nominal voltage.
  4. T

    PC interface balancing chargers for RC / EBike

    If I were you I'd reconfigure the cells to be 2p. Not only would this half your charger requirement, by nature if keeps more cells in ballance.
  5. T

    Battery Needed

    NiCad cells can typically handle higher discharge rates without suffering from reduced capacity. Yes, you can do this. Yes, if they are the same voltage and only in parallel. Same as above.
  6. T

    NiMH string cell balancing options

    C/10 is the typical charge rate used for equalizing/overcharging cells.
  7. T

    RC motors with planetary gears

    Bane-Bots have some reasonably priced planetary gear boxes good for a few hundred watts. http://banebots.com/c/P80A-nnnn-0005-Rn
  8. T

    Calling all Sanyo Ni-Cad Battery Experts

    FYI, I came across these cheap nicads today. $3.50 each for 4.5Ahrs. Their internal resistance is only 6mOhm so they should be good for reasonalby high discharges. Data Sheet
  9. T

    Electric motors are immune to altitude, so?

    One thing that does indirectly affect EV's at elevation is the colder climate. Batteries don't like it cold. Back when the EV1 car was around they only leased them in CA and AZ because of the warm climate.
  10. T

    Bosch Litheon vs duck-tape batteries (Ping)

    I'm looking at a new power plant and have been gathering information on the Bosch litheon cells. From what I've gathered, they are 36V at 2.4Ahr packs. Doc says they're good for 10C. I can grab the drill kits off ebay for $180 right now (drill, 2 batteries and a charger). Comparing costs, 4...
  11. T

    Calling all Sanyo Ni-Cad Battery Experts

    I'd thought I'd follow up by saying that I'm using the N-3000 cells. While heavier than other technologies, they stand up to abuse and have a long life.
  12. T

    Calling all Sanyo Ni-Cad Battery Experts

    Those are standard rate cells (~3C max). For high discharge I'd recomend the CP-2400 (sub C) or CP-3600 or N-3000 (C) cells. http://sanyo.wslogic.com/pdf/pdfs/CP-2400SCR.pdf http://sanyo.wslogic.com/pdf/pdfs/CP-3600CR.pdf http://sanyo.wslogic.com/pdf/pdfs/N-3000CR.pdf
  13. T

    RC guys are smart, maybe powertool guys are smarter

    I doubt any of the dewalt transmission installed in robots will ever see 100hrs of use. However they do see a lot of shock load, and rapid changes in direction. The transmission has 5 planet gears per stage and a steel ring gear (unlike cheap drills which use plastic or pot metal ring gears)...
  14. T

    RC guys are smart, maybe powertool guys are smarter

    The transmission does have "no back drive" pins, but they can easily be removed. I've used these transmissions before in hobby robot aplications.
  15. T

    RC guys are smart, maybe powertool guys are smarter

    Great article about shifting the dewalt transmissions on the fly. Note that they are adapting the transmission for other motors. http://www.okpreengineering.org/courses/2006_EDD_FIRST/03_Drive%20&%20Mechanical%20Systems/Team%20647_NothingButDewalts_Rev1_0.pdf
  16. T

    Dewalt vs Bosch Litheon

    Does anyone have experience with the Bosch cells on an eBike? Everyone seems to like the Dewalt packs, but the dewalt pack prices have been climbing with the bosch packs are falling. $150+ vs $85. Some notes from reading other threads: Bosch packs are a true 36V while dewalts are 33V Dewalt...
  17. T

    Another DIY great project of Dewalt battery for CAR!!

    Holly Cow, thats ~$11,500 worth of batteries!
  18. T

    Armature Current Limiting

    A couple notes about using the Allegro current sensors. (I've played with these a bit). The data sheet calls for a .1uf cap across the supply near the sensor. Voltage output for the ACS755 at 0A is 0.6V (not 1V). The sensitivity varries somewhat from sensor to sensor (+/- 6%), so you might...
  19. T

    Armature Current Limiting

    By using the 3.3K/10K pot/3.3K ciruit the voltage range accross the Pot is limited to 1V to 4V. Without the 3.3K resistors the voltage would swing 0V-5V.
  20. T

    new Kelly brushless regen controllers

    Delta terminated brushless motors draw 1.7X more current than wye for the same motor wind. Maybe that's why they make the disclaimer.
  21. T

    motor and battery help please

    Capacity alone might not be the issue with your batteries. Cheap SLA's simply cannot supply the high current demands of high power motors. For batteries I'd go with a Hawker/Energys Genesis type AMG battery. These can source something like 400A. The 13Ah or 16Ah would suit your needs. As for...
  22. T

    Tenergy brand batts...

    Want cheap Whr's? Try Lead acid. Here's a Hawker Genesis 12V-13h for $50, hmmm thats less than $0.40/Whr. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=330148932069 $/Whr is not my only concern, I also consider Whr/lb and Whr/ft^3.
  23. T

    Tenergy brand batts...

    Here's a link to some reasonably priced NIMH sub-c cells that do perform as advertised. http://www.maxamps.com/44K-Loose.htm Retail works out to about $1.32Whr. They typically offer unadvertised deals to RCGroups forums members so I bet you could get a deal for a bulk order of 60 or 90 cells...
  24. T

    Honey, I shrunk the Aztek.

    I think it looks more like a Honda element rather than the Aztec.
  25. T

    eBay Hub Motors

    350W and 250W respectively, they sound kind of weak.
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