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Electric motor mounts

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I see three designs for motor mounts.

I'm thinking of printing a negative in openSCAD and then pouring them in aluminium.
Caliber Trucks seem favoured because of their stability and Squarish aspect to the cross section.

Thoughts on these designs ?

Electric Skateboard Caliber Truck Motor Mount
Motor Mount for Electric Longboard

Hey folks,
since i got asked, im posting my WIP stuff here as well

My Motor Mount
http://www.thingiverse.com/thing:2282194
right now im lacking the VESC to actualy test it. its made to be used with a "Turnigy Aerodrive SK3 - 6374-192kv" motor

Battery indicator
http://www.thingiverse.com/thing:2282185
Works well for me, need to make it slighty longer so it covers the complete whole in the longboard

Battery Covers
http://www.thingiverse.com/thing:2252464
The angled edges have been way to brittle in my prvious version. this should be better but i ran out of filament XD

Electric Skateboard Motor Mount
Electric skateboard - Battery indicator cover
Electric Skateboard Battery Cover

Here's my version:
http://www.thingiverse.com/thing:1528916
the Youtube videos show a good overview of the parts I used.

Electric longboard motor mount
by Jonni

Hey everyone, new here. I just designed a 3D printable motor mount. They are specifically for ebay longboard trucks (link is below), and is inspired by a design I saw by this guy on instructables (link is below). Mine has been working extremely well (http://www.thingiverse.com/thing:1753981), I initially printed it in PLA at 40% infill and got 20 miles in until one of the pieces cracked. I reprinted it at 75% PLA and this thing is really solid, don't see it breaking anytime soon. I put pictures of the setup, 3D models links, and a video about my board on the thingiverse page, thought you all might be interested. It uses 4X 1/4"-20 rods to hold everything together and add rigitity, and also allows for the belt to be tensioned. It was designed to be used with a torque boards motor, because all the sk3's were out of stock :/

Ebay Trucks: http://www.ebay.com/itm/Blank-Pro-180mm-Reverse-Kingpin-Longboard-Trucks-10-Axle-Black-/140892408040?hash=item20cdd788e8:g:vIUAAOSwnDZT9ikx

Inspiration Instructable: http://www.instructables.com/id/3D-Printed-Electric-Vehicle-Zero-Compromises/

My Motor: http://diyelectricskateboard.com/diy-electric-skateboard-kits-parts/electric-skateboard-motor-6355/

Electric Longboard

those trucks are made to be clones of these trucks, afaik ; http://randal.com/180mm-42-or-50-black/

nice design - very robust looking mount. I like the use of spacers to get the belt tension stable.
I see you're using HTD belts. notionally teh GT variant has better torque transfer. Probably doesn;t matter too much as the 3d printed pulley won;t be as accurate as a metal CNC one.
Any thoughts on htd vs GT. I see you're using a 9mm belt.

Thank you! The spacers to tension the belt really help with torque transfer, before the belts kept slipping while going up hills or braking hard but after proper tensioning I haven't had any slipping. The decision to use HTD belts vs. GT belts were simply because I found someone already designed a wheel hub pulley for HTD, so I decided to just use theirs (http://www.thingiverse.com/thing:545345). If I were to redo it, I'd probably use the fatter 15mm belts, I hear they last longer than their 9mm counterparts.

40t HTD5 Electric Longboard Pulleys for ABEC 11 Flywheels & Clones - 9mm & 15mm
by brentyi

when i hear GT belts , all i hear is timing belts ;) but TIL about GT2/GT3 belts

my motivation was also just by going of the others from the fora :
https://endless-sphere.com/forums/viewforum.php?f=35 mostly , but also http://www.electric-skateboard.builders/

some belt profile info stuff i found while researching this;

http://gatesbeltsandapplications.blogspot.nl/2010_07_01_archive.html
http://www.sdp-si.com/D265/PDF/D265T003.pdf

I've been building an extension for inkscape to characterise these and it now has al the GT2,3,5 and HTD3,5 belt info in it. The GT2,3,5 series has very good torque transfer. I guess its the specific shape of the D-shaped teeth transfers torque better than the pre-existing shapes.
Output looks like this - still WIP.

http://i65.tinypic.com/vvsl2.jpg
I'll start a new thread soon I hope. Maybe you guys can help me test it and get it working properly. Then I'll post it up on sk8 and endless-sphere

this is amazing and you should post a bitcoin address on final pic ;)

Found it. By Toragee

Some have adjustable motor mounts.
Some have clearance issues with bolts.
Any ideas on adjustments for the best design ?
I'd like to make one that could be printed:

  • with ridges for strength, or similar gaps for adding an strengthening rod into the plastic
  • with adjustment but plenty of clearance
  • that fitted the SK3 and the 5065 style (and others) motor mounts
  • where the bolts don;t foul the belt, truck, wheel spacing.
    I also think that front wheel drive is gaining traction(lol) as 'better' than a rear wheel pusher.

I've already posted my opinion on the first one by Michael ID33 on ectric-skateboard.builders. It could be a lot better. I have a design for my Calibers II that I printed for a test fit and then had machined and they work beautifully. I"ll see about posting them later since the orional files are not in solidworks and I'd have to start over. Interested to see if your casting method works but I was going to redesign them for ease of manufacturing. Also they fit a 32mm bolt pattern of the Turnigy SK3 260kv Theres another motor mount thats meant for Caliber Trucks. This one http://www.thingiverse.com/thing:1480677 dont know what motor it fits

The Turnigy SK3 does seem like the best choice in motor. Good to know its a 32mm bolt pattern.
Do they work as well in front wheel drive configurations?

yes totally, i love my SK3 frontwheel setup

sadly the SK3's suffer from massive out-of-stockness ;( ordered a aliexpress 5065 270kv sensored now