Spinner Weapon Motor Discussion

[big_nipper]

Spinner Weapon Motor Discussion

John, Our first spinner used the same pancake motors. It had a 2:1 ratio on a 600mm dia disc with the disc weighting only 500 gramms. These motors are very slow compared to an EV or Astro so a big gear ratio would make it run slower, It used a large O-ring for the belt from a car asseccory shop on 2 very deep pullies. We did have one problem with the motor as the shaft is only pressed into the disc armature and it started spinning after only a few test hits. A couple of grub screws fixed this easy enough. On testing we were actually using 240W of power once the disc got to full speed and even more spinning up, so after a fight it was red hot but we never burnt it out.

[lex]

Spinner Weapon Motor Discussion

Thanks Mark- very useful to know about the need to secure the shaft before we use it! Handy to know that its normal for it to get really hot too. I hope to start making the featherweight in the next couple of weeks, although presently the main focus is getting the Roboteq and the NiCads into Ka-Pow! for Birmingham. thanks again everyone.

[knightrous]

Spinner Weapon Motor Discussion

Im not too sure what range of cars you have in the UK, but over here in Oz, I found a 12v 75watt pancake motor which seems to handle 24v quite nicely. It came out of a Ford Telstar. It weights 750g, 110mm diameter and 40mm tall including shaft(shaft is 8mm double D shaped).

If your looking for a non-pancake style motor to suit your design better, a Mini EV is a cheap and effective weapon motor. We have one in our featherweight, Vertical Limits, which has a 3.4kg 300mm diameter flywheel which rotates at around 4000rpm. The Mini EV survives a full battle just running of two crappy 2.3amp SLAs in parallel.

You can buy Mini Evs here: http://www.robotmarketplace.com/marketplace_motorsmisc.htmlhttp://www.robotmarketplace.com/mark...otorsmisc.html

On that link, check out the HTI motors with 5mm shafts, they might be a half decent motor, but I havent personally used any.

[dragonmaster_1]

Spinner Weapon Motor Discussion

Will let you know about the HTI motors as we are trying them out on one of our new spinners we are useing 2 to power the 2kg disc.

[knightrous]

Spinner Weapon Motor Discussion

I believe the HTI motors will do quite nice if you run them on 12-14.4v and possibly 18v if you gear the weapon enough and share the load between two motors. Ive seen a few of them smoke at 24v, mainly in Hellbringer X (Aussie Rambot with 4 x HTI motors with SS2 gearboxes on 24v powered by 3600mAh Battlepack)

[lex]

Spinner Weapon Motor Discussion

Tony: I meant to ask you- on a motor like the HTIs or the mini EVs, which have a really skinny motor shaft, whats a sensible way of attaching drive pulleys or sprockets to them securely?

[dragonmaster_1]

Spinner Weapon Motor Discussion

Most people use grub screws but I have welded mine on to the shaft but you have to be very carefull, cover the motor so not to get any bits inside. Dont try to weld it all at once as it will get too hot and could damage the motor.

[lex]

Spinner Weapon Motor Discussion

Thanks Tony. Initially Ill be using the RS pancakes, but the prices on mini EVs and HTIs are low enough to encourage experiments next year...

[robjones]

Spinner Weapon Motor Discussion

If the shaft is 5mm then the trantorque keyless fitting is very good. RS sell them

[aliboy]

Spinner Weapon Motor Discussion

I didnt want to make a new thread so ill just post here , I want my wearpon motor to turn on , and i want to build a mechanical switch myself , i mnow i would need a relay , a microswtch and a servo , but how do i wire the whole thing up ? The weapon motor im using is one of the pancake motors mentioned in the for sale section , any help would be great .

[aliboy]

Spinner Weapon Motor Discussion

Sorry for the double post , But i have had another though , would it be easier if i just got an electronize rc switcher and a relay and it woould just turn the weapon on/off , Would this be easier ?

[philip_taylor]

Spinner Weapon Motor Discussion

I like your idea of an Electronize RC switch activating a relay.

[dragonmaster_1]

Spinner Weapon Motor Discussion

On DragonStrike I use a servo connected to a toggle switch to turn the weapon on/off simple and cheap but it works.

[knightrous]

Spinner Weapon Motor Discussion

Only problem is that it doesnt failsafe Tony Easy way for me is to use a PicAXE 08M or my IBC

[dragonmaster_1]

Spinner Weapon Motor Discussion

It does if you add a failsafe between the servo and reciever £11 for the failsafe £2.50 for the toggle switch Like I said cheap