Graupner motors

**psycho_fling** · 26th July 2012, 21:33

you should be able to remove that torque limiter they normally have 2 screws, undo them then remove the spring and lock the gearbox using grub screws - the tutorial you mentioned im sure will cover this in more detail

the batteries if your talking about the drill batteries those wont be much good but if they are new should hold they charge (bearing in mind they will be 1200mah cells, ie not very high in robot uses)

if you have an itelligent charger then you could try and cycle them but it probably wont do much for them, upgrade now and save hassle later......and dont put them in the fridge.........never ever heard that idea before

**archie2000** · 26th July 2012, 22:24

got that from an old robot book

but it should be ok with the torque thing on will it?

**Max** · 26th July 2012, 22:47

It's harder to mount the motors without removing it and you won't get the full power from the motors with them on.
I think the fridge thing is for storing certain batteries if your bit using them for ages to stop them losing their capacity.

**Ellis** · 26th July 2012, 22:56

If you're overvolting, even by a little, and you slam the throttle on, it's possible you'll make the torque things just slip. They're pretty simple to deal with. They don't have to be grub screws; any 5mm screw will do.

As for the drill batteries, you may know we went that route and whilst they worked, they were far from great. The power to weight and size ratio is pretty bad, in truth. They got incredibly hot, each cell actually only took about 1Ah, and their power output was poor. Something like this will save a lot of hassle: http://www.ebay.co.uk/itm/12V-3700mAh-S ... 474wt_1396, and for the build quality and cost, it's worth it.

That pack can put out 30amps, fine for 2 drills, pushing it for 4. If the first stage of gears in your drills are plastic I wouldn't particularly recommend overvolting or making masses of current available to them anyway, i.e., with more powerful batteries. Chances are they'll strip.

**mattsdragons** · 26th July 2012, 23:24

I managed too strip metal gears in a drill at 18v, but you could be ok at 14.4

**typhoon_driver** · 26th July 2012, 23:33

You stripped metal gears in a drill gearbox? I call BS on that

**Ellis** · 27th July 2012, 00:07

We quite badly damaged several metal gears in drill gearboxes whilst in the UK.

Edit: http://s1088.photobucket.com/albums/i32 ... 012402.jpg

**ewan** · 27th July 2012, 00:16

I've done the same, a few teeth on each gear tend to get chipped off rather than stripping the whole thing. In the last stage of course, and in overvolted drills.