My First E-Dune Runner

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If I had to do it over again I'd probably get something over 20A but still 24v for sure. I only got the second one b/c I already had the first and I knew I wanted to connect them together. W/ batteries able to charge at > 6c, 30A would be ideal.
 
Missed out on couple days of your thread....Sounds like it moving along great!....can't wait until you try the belt setup.

RCDAD belt setup has 40 teeth on each pulley...how many teeth are you using on the A shaft and how many on the D?
 
One of my main objectives is to lower the gearing so I have 12 and 14t for the A shaft and 20 and 24T for the D shaft.
 
mulepic said:
One of my main objectives is to lower the gearing so I have 12 and 14t for the A shaft and 20 and 24T for the D shaft.
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Are you using an HTD3 or HTD5 belt / pulleys? Or something else?

Thanks!
 
I finally drained my batteries to the lvc and was able to charge them in series w/ the psu's in series. It worked out just fine, nothing caught fire or over heated. I took just over 30mins to charge these bricks!

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Belt drive begins

With this picture I'm trying to show the first hurdle. The A pulley sits outside of the D pulley. But it's not nearly as bad as I thought it would be. I might actually give this a go w/o modifying the gear plate. The belt simply sits on the inside of the A pulley and the outside of the D pulley and it's at the slightest angle. I don't know a thing about belts and pulleys so I don't know if there is any leeway in pulley alignment or they HAVE to be dead on.

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Aside from this I don't really like how short the D shaft is for the pulley. The center of the pulley would be just over if not outside the nut on the shaft. I'd much rather have a longer D shaft. But I don't have any way of machining hardened material.
 
Kaz the Minotaur said:
Maybe I missed this part but where are the chargers? All I see is power supplies. At what amperage are you charging them?
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I'm connecting the batteries directly to the PSU's, no chargers are involved. It's referred to as bulk charging. The PSU's voltage matches that of the batteries (more or less). The batteries do not come out balanced but for each pack the total voltage difference among the cells was .03v, close enough for me. The packs will get balanced charged when I put them at storage voltage.

The batteries are being charged at just about 20 amps constantly up until the last few minutes. I monitor the current throughout the charge cycle and adjust the PSU voltage to keep the current maximized. To make this a less manual process I'm thinking about programming a micro controller to do it for me. I just purchased my first arduino so that'll be a ways away.
 
RCDAD said:
If its not straight the belt will wander until its straight.
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I was curious about that. I was hoping it's more like a chain where some misalignment is ok. Since these pulleys have flanges on both ends I was hoping it would hold the belt on.

I did measure the amount of misalignment and it's .035" over a 4" run. To do minimal permanent damage I might give it a go (on the bench) and see how it turns out. I'm going to focus next on how to mount the pulleys to the shafts.
 
This morning I bored out the inner hole of the D pulley so I could fit the nut/wrench in it. I need to put a flange on the pulley so it pushes up against the inner race of the bearing when the nut tightens down. Then I'll tackle the pin that''l go through the pulley and shaft.
 
mulepic said:
This morning I bored out the inner hole of the D pulley so I could fit the nut/wrench in it. I need to put a flange on the pulley so it pushes up against the inner race of the bearing when the nut tightens down. Then I'll tackle the pin that''l go through the pulley and shaft.
Click to expand...
You could also take just a bit of material to line up the pulleys.
 
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