Electric Flexboard Project

[AussieJester]

which mtnboard ?
this guy flips the trucks mounting for lower deck height..
http://www.bgsurf.blogspot.com/

What a duuuude!!! skaters never quit just grow old and
keep skating it seems, good on him!

KiM

[flathill]

http://www.flexboardz.com/riders-area/n ... -powerflex

[addicted2climbing]

Hey Flathill,

I had wanted to go the hub motor route as well, but in the end decided to design it around using as much of the orriginal parts as possible. I had found some smaller hub motors then the ones shown, but they did not seem suitable and I already had a background in R/C electric systems on airplanes so thats the route I chose. The Hub motor is a much cleaner design since it avoids chain hassles and some of the R/C pitfalls and hopefully by the time I get mine figured out I can then work on a design for smaller hub motors...

On another note, I got a few parts machined today so finaly chips are being cut...

Marc

[addicted2climbing]

Hello All,

Its been over a month since I updated my progress but works been so busy not too much has happened. I have a few parts machined and most of my time lately has been being schooled in the fine art of Hobby PCB making. First results only OK, but have learned a lot and think my next go will be better. Below is a pic of the shafts I machined for the tension rods and one assembled with the spherical rod end. The black piece on the motor is for an optical board for motor timing. I currently have the front of the motor removed as I need to drill some #2-56 tapped holes in the face. Once I get the motor and optical board working I then will machine the swingarms...

Take care,

Marc

[AAAkings]

Thanks for the update Marc, Look forward to seeing this thing progress!

[addicted2climbing]

Hello All,

So I made a bit of progress on the circuit board for motor timing. I had struggled with the toner transfer from printer paper method of PCB making and due to that switched to a material called "Press N Peel" which worked much better. With the Press N Peel I got a good transfer first try and etched the board Friday after work. I test fit the hole pattern on the modified motor plate and it fits perfectly. I have 2 boards on this plate and plan to cut them out today, drill the holes needed and hopefully populate it sometime this week. This flexboard project has taught me so much and this was my first attempt at PCB making and I now know its not as scary as I thought it would be. Now I just need to get more background in PCB layout. This one was done in Solidworks since it was a simple schematic.

While this is my own schematic, I cant take credit for this idea since Burtie did this first. Had his fit my application I would have bought his. Unfortunately I had space constraints which prompted me to make my own. Also I wanted to learn something new and give PCB making a try.

[addicted2climbing]

Hello All,

A bit more progress. Boards cut out and installed to test fit and now ready to populate. Also drilled the bolt pattern in my sprocket and sprockets installed. Once I verify the circuit works on the timing board I then can finaly get my swingarms machined...

Have a great Turkey Day everyone...

Marc

[bzhwindtalker]

nice sensor pcb! i like it, cant wait to see this board rocking! cheers

[addicted2climbing]

I stayed late after work and soldered some of the components to the board. It's populated but I am missing 3 Surface mount Resistors. I had a mistake in my previous schematic and it caused me to order the wrong resistors. I need to get some 1K resistors on order. I may get desperate and use some standard through hole style soldered to wires just to test to make sure it all works. I have found soldering the resistors and the sensors easy, but I had a hell of a time soldering the capacitor. I am sure the second board will look much better.

[addicted2climbing]

Been a while since I updated this. Unfortunately I have not had much time to work on this project since the company I work for was going through a move and everything had to be packed up. Anyhow, I test ran the motor with the board and found that the R/C speed control is not recognizing the board as a sensored motor and in doing so switches over to sensorless. I am using a the Turnigy 150 amp 1/8 scale speed control for sensored/ sensorless motors. If anyone has any experience in using this controller in sensored mode that would be great. I think one of my problems is possibly with my schematic. The optical sensors are switching but the drop in voltage is not enough. It goes from 4.5 volts to 2.9 volts. I think it need to sink more closer to Zero. My coworker suggests I run the imputs through a Schmitt Triggered Buffer (eg 74HCT04). I plan to go back through some of the forums on adding halls to see if others had this problem with Turnigy controllers.

If anyone has any suggestions I am all ears...

Marc

[AAAkings]

Just wondering where you got your sprockets from Marc? It looks like it is comming along nice!

P.S. Wondering if you are going to run an inline fuse (Possibly slow-blow) to protect your esc/motor. Don't know if it is even feasable without causing too much issues...

[tuurb]

Hi marc,

Nice things going on there!

I read your last post about your problems with the ESC.

I cant help you but 'HumboldtR'c who is active on this forum could probably help, he has a mountainboard with 4 of these ESC's wich he uses in sensored mode with hal sensors if I'm correct.

I plan on using this ESC to with hall sensors on my stand up e-scooter so keep us updated

[addicted2climbing]

Hello Tuurb,

I have contancted HumboldtRC before but the last message I sent him did not get a reply. Maybe he never got it and I can try again. I have read the thread on adding halls and if worse comes to worse I cna still do that as I added provisions for both just in case this board did not work. I have an idea as to why its not working, but have been too busy with my job relocating and the holidays that I have not had a chance to look into it. I plan to get back to it next week. If you get the halls to work with the speed control definately let me know...

Marc

[sk8norcal]

Marc, this yours?
Cintrich inspired ?
how about the yellow scooter, and the sit ski/board?

http://www.flexboardz.com/index.php?opt ... &Itemid=62

[sk8norcal]

the other powered one with rc motors,
by Peter N

http://www.flexboardz.com/riders-area/n ... exboardz-3

[addicted2climbing]

Marc, this yours?
Cintrich inspired ?
how about the yellow scooter, and the sit ski/board?

http://www.flexboardz.com/index.php?opt ... &Itemid=62

Hey SK8norcal,

The board with the black metal deck is not mine. It's Andrew's.. He was planning to build a mountainboard like Humboldts, but after seeing the flexboard he decided to electrify a flexboard instead. It's for a school engineering project and it looks really good. We keep in touch, but lately I have had to shelve my project due to my work moving but plan to get back to working on it soon. I ran into an issue with my sensor board and i have an idea of how to fix it but have not had the time or resources to try lately. Andrew if your monitoring this give us an update on your progress.

as for the yellow scooter its nto mine either.

The one made by Peter N is really a work of art. I chose to try and reuse as much as I could from the stock design to keep costs down whereas Peter's board is done without compromises. He pretty much designed all new parts. I like that he has his axels on concentrics so he can tension his chain that way and his motor remains fixed. He also has idlers which is nice since his motor does not need to move... His sprocket interfaces key into the bearing holes on the hubs which aid in keeping the sprocket concentric with the axels...

[sk8norcal]

The board with the black metal deck is not mine. It's Andrew's.

is he on here?
build thread?

[addicted2climbing]

His user name is AAAKings. I dont think he started a formal build thread yet.
However he does have many posts on ES from gathering info.