Featherweight Drive Motors

I am working on my new featherweight and am at the point where I should be looking at drive motors. Weight is going to be an issue because of the pneumatics.

Basically I am after any suggestions for drive motors for a feather so I can decide what to go for. The only real limitation is the motor should be as close to inline to the drive shaft as possible due to the space available.

I want to avoid drill motors, but the list so far:

speed 900s
speed 720s
dewalt powerdrive kit
astroflights
banebots 775 motors and planetary gearbox

What other options are available for featherweight drive?

Thanks
Andy

drill motor
bosch 35w

Drill motors
And like ^
Bosch

These are ok and quite like the old technobots gold motors. Got one gear box made so far and you can make up the gear boxes with two bits of nylon 6 and a few spur gears. Just rebuilding BOOM! to work with these and they seem ok so far.

http://www.ebay.co.uk/itm/300511267976

bought a couple myself. They are a copy of a speed 900. Similar specs and dimensionally the same. They drew the same no load currents when I tested them as well.

What would people recommend for a 90 degree gearbox for a speed 900 or are there any motors which come with a 90 degree gearbox already fitted?

Windscreen Wiper motors and Bosch 35's come with 90degree gearboxes I believe.

I am not using wiper motors again!!!

Haha, given their weight and size you'd think they'd be super powerful!

So why avoid drill motors? They're powerful, small, light and some with fitted gearboxes that are equally small and light. There's also a chance the BG is all metal and they are cheap!

for 90 degree gearboxes you are either looking to bosch 35s or to a custom solution

Knab the gears out of something like this http://www.toolstation.com/shop/Power+T ... 400/p40354

would have though they would be plastic gears and that they wouldnt be strong enough?

Wouldn't think so, should be designed to take the torque of a drill

Team RCC has looked into speed 700's and 600's for a feather drive. It always involves a 2 stage gearing.
But it is possible. After all, the most we ever have drawn from the batteries in a fight with a feather is 35 watts.

19.6V, 5 minutes. Means an avarage amperage of 21 amps. So any motor with a stall of 40 amps+ can do the job.

For cheap 90° gear sets that can do the job, look into budgetfriendly 4 or 4.5 anglegrinders. Those are ment to take the power (from 500W to 1100W), can be cheaper than seperate gearsets from HPC or simular, and come with bearings and all. Gearratio from the ones I used for Prodigy Evo's dual Speed 900 disk-drive were 2.5-1.
Meaning, if you add a first stage 12-72 (6-1), you have a 15-1 gearratio, meaning with 80mm wheels @12V with a speed 700 (15K rpm), the endspeed is 15 km/h.

Thanks for the responses, I am going to have to finish machining the big bits before finalising the drive. Still not really sure what to use...

Quote:

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Originally Posted by typhoon_driver

bought a couple myself. They are a copy of a speed 900. Similar specs and dimensionally the same. They drew the same no load currents when I tested them as well.

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Did they work out for you? I'm thinking of replacing my overvolted 18v drill motors with them.

Also, what kinda ratio would you run to a 75mm or 100mm wheel if the motor was running on 22.2v lipos?

for 20km/h 100mm you need a 13/1 ratio

Hi All

I am building my very first featherweight, Shrapnel,

[attachment=2:3rtvkz2c]Comp Shrapnel MKII Assem 05.jpeg[/attachment:3rtvkz2c]

[attachment=1:3rtvkz2c]Comp Shrapnel Proto 01.jpeg[/attachment:3rtvkz2c]

[attachment=0:3rtvkz2c]Comp Shrapnel Proto 04.jpeg[/attachment:3rtvkz2c]

and I have already made a mistake with motors...

http://www.technobotsonline.com/re-540- ... -50-1.html

These are the ones I was going to use but after a chat with James Cooper from Robochallenge he recommended that I use something else. I know that drill motors are a good choice and I found these, on the same site stupidly, which might serve as a replacement€¦

http://www.technobotsonline.com/re-975d ... x-4-1.html

Would running 4 of these (not necessarily this ratio) be a good choice? What do the veterans think?

Also I need a motor to drive my weapon, a 2kg spinning disc. I am using 2x 7.2v 5.1 Ah NiMH racing battery packs, wired in series, for the power which puts, as far as I know, ampflow/brushless LiPol motors out of contention. Any recommendations.

Thank you in advance

Alex

Bosch 35's for drive, you might get away with just one each side.

Thanks, do you have a link for any or when I could buy them? I can only find chainsaws :crazy:

That robot looks great! Nice to see a very different design and I like all the laser cutting.

Bosch 35 are found in the electric car seat assemblies of Jags, eBay, Scrap yards, are yoru best bet. Do you not want to use Drills because of size constraints?

Theres two on one of these http://www.ebay.co.uk/itm/JAGUAR-XJ40-X ... 20be5252b7 what size wheels are you planning on using?

Spinning weapon standard is a Speed 900 motor http://www.cornwallmodelboats.co.uk/aca ... _6373.html. and you could run it off a relay rather than an expensive speed controller and it'll work nicely.

I have a set of the 919D motors* that I took out of an old FW if they are any use to you. I replaced them with drill motors before using them, but they do run on up to 15v whereas the ones in your link (to replace the current ones with) only run at up to 12v I think it says. Saying that, it will probably work at 14.4 that you're using but might burn out sooner. Bosch 35w's or drill motors seem to be more popular though :)

* http://www.technobotsonline.com/?subcat ... cts.search

Thanks, though the actual cutting was done at my university, if only I had my own cutter.... (day dreaming)

Is it only jaguars or are they in other cars to? I have been to my scrapyard before and picked up a pair of windscreen wiper motors for another project but there was not a single jaguar there! Plenty of Renault Clios and Pergeto 206's but no jags...

I am guessing you mean I should use these for drive btw, not the weapon?

Yup, Bosch 35w for the drive and possibly a Speed 900 for the weapon

Or a car radiator fan motor for the weapon (or so I've been advised) currently building a robot with one, I'll let you know how it works out!

And there's a reason scrappies are full of 206's and Clio's.......

This may interest a few of you: viewtopic.php?f=168&t=4612

I would recomend the banebot gear box's can fit a 550 motor on but later if needed more power the motors can be swapped with something more powerful and the gearboxs are made to withstand , i've bought a pair to make a feather with

Those Gimson GR01's look perfect! How many of you use those or would you recommend them anyway?