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  1. M

    Mounted bearing units - sources, care and feeding

    This is a more generic mechanical topic, but my recently completed EV project used a dozen 4-bolt mounted bearings, all the same generic < $7 model. They're supposed to be self-adjusting with the bearing able to swivel within the housing, but they've been inconsistent - some swivel easily out...
  2. M

    Is my project salvageable?

    i watched the burn (this video was taken just as we were heading out there) but didn't hear about the guy who ran in until hours later. I'm on the car driving in this video, but I can't say for sure where I was sitting. Maybe on the front left. No booming music on my car - just a cheap car...
  3. M

    Is my project salvageable?

    Thanks to everyone who answered my questions! The project worked out great. Steering was indeed challenging with a heavy load, but the car performed well at Burning Man and carried up to 12 people at a time. Most cruises were 6-8 people. I never found out the maximum range, but it had no...
  4. M

    Is my project salvageable?

    I'll run through what I've got in my spreadsheet. The motors have a 6:1 reduction planetary gearbox built in, so I'm starting with 500 RPM at the motor shaft and 9.2 lbf*ft of torque for each motor. 11t motor sprockets to 18t jackshaft sprockets, to 12t to 24t on the axles. That's a 3.27:1...
  5. M

    Is my project salvageable?

    Sure - I actually tried to attach a photo with my first post, but it didn't take. Here's my build log: https://imgur.com/a/1WJ0G
  6. M

    Is my project salvageable?

    Thought I'd post a quick update. Got a replacement motor, wound up swapping out the gear head with the dead motor because the old one seemed to run smoother and quieter, and I put squirrel cage blowers on both motors. I used 4" PVC vent caps as mounts and epoxied the fans on, then added some...
  7. M

    Is my project salvageable?

    Apparently (undocumented features again) read-only commands don't need a checksum, just the ones that write settings. Still seems unwise to me since the host won't know if a command was misheard and misinterpreted. I checked and it was actually 36 feet I got, so I think that's a decent price...
  8. M

    Is my project salvageable?

    I figured out the RS-232 problem this morning. I'm blaming this one on the documentation. The transmit data pin on the controller is marked RX0. I've seen plenty of swapped TX/RX pins and the reason I set up a script on the controller was to check for that and see if I got anything out on...
  9. M

    Is my project salvageable?

    Well, I built the upper frame / deck portion today, so now there's much more space for temporarily throwing things on! This part was built with 3/4" square tubing instead of 1" like the lower frame and in retrospect I think 3/4" would have been fine for the whole thing. I always underestimate...
  10. M

    Is my project salvageable?

    I think I'll skip trying to get to the brushes for now. I may see if I can get a replacement motor and salvage the gear head, or see if the gear head will work on the non-geared MY1020 motors I have. That will be AFTER my current deadline crunch is over, though. I don't know how many more...
  11. M

    Is my project salvageable?

    Thanks so much. I went through a lot of that on my own today and it's good to know I'm not totally off track. That's great information about the various types of damage. I put the car up on jack stands today and did some more testing. I wasn't sure if I trusted the current readouts on the...
  12. M

    Is my project salvageable?

    Posting in this forum despite my project not being a scooter, but it's also not really a car and the motors are basically scooter-class so I figure folks here might have the answers I need. I'm building a small vehicle that's going to be the base for a Burning Man art car. The speed limit out...
  13. M

    Need some gearing advice for a slow offroad EV

    That's reassuring about the power requirements. I've got a tiny Razor electric ATV with a 350 watt motor and it can carry me over rough ground in the vacant lot across from my shop, so 1600 watts seems like it ought to be plausible for 4 people. My budget has pretty much evaporated - I'm a...
  14. M

    Need some gearing advice for a slow offroad EV

    First off, let me say that I'm a total noob when it comes to designing and building an EV and may be totally wrong about any number of things. I welcome feedback on all aspects of this project. I'm building an EV to carry 2-4 adults at 5 MPH on level but dusty ground. I've built some pieces...
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