I would doubt they are anything special. Won't see much difference from a 550 and they might even be worse going on the ebay seller's description rather than the data sheet.
Well, I'll grab a couple anyway and give it a look; given the cost I'm not too fussed if they turn out to be useless.. I'll report on how they do.
Have to say though that the 550's I have have a no load current of 0.8A at 9V, where as the 600's are quoted at 2A, so either the 600's have lower winding resistance therefore more power, or the 600's just have rubbish bearings :P
Yeah good stuff. If they can at least match a 550 then I would get some.
I measured the wattage of a few different drill motors at around 80 watts or so, and that data sheet talks about 110 watts give or take. I imagine it will be noticably more torquey than your 550. I think for a time Little Hitter ran Speed 600's at something like 22v and that goes like hell and quite happily shoves stuff about in the fw champ vids.
If you want to try out something different then you could try and stick a pneumatic muscle in there, very cheap to make and could power it off a small compressor or CO2 bottle with regulator. Could make for a very cheap pneumatic setup and doesn't need to be too quick as it's just a lifter.
Yeah, I'm only looking for something like a 50% improvement or whatever; the 550 in there works fine, it's just a little on the slow side and pretty strained lifting another robot (the lifter has a max lift of 20kg before it stalls). A bit of extra power and speed would just be nice.
I've got all the parts to make a pneumatic lifter setup like the one you described Max, but it'd be too drastic a change; the lifter I've got works very nicely so don't want to change it too much. May have a look at pneumatics in another robot; I'm currently hoping to experiment with LP pneumatic flippers made from 2 stroke engine parts at the moment :P
Well the 3 Johnson 600's arrived. The build quality of them actually looks better than the 550's in the argos drills, so that's a good start.
They have a winding resistance of 0.2 ohms, as opposed to the 550's 1 ohm, giving it a stall current of 60A at 12v. This is understandable when you have a look at the windings; they're quite a bit thicker in the 600s, which also implies fewer windings as they're packed in the same space.
Idle current is about ~2A at 9.6V, which is what was quoted in the data sheet.
They are slightly longer than the 550, which is mostly down to the stronger bearing mounts, but there is a little extra length in the coils.
WP_20141205_001.jpgWP_20141205_004.jpg
Running on 12V, the 600 sounded about 30-50% faster, though I have no way to quantitatively test it atm.
Also seemed to have plenty of torque, though again, grabbing the output shaft with pliers is not a very accurate test. Did heat up quite quickly when put under load though.
The mounts at the front are a direct match to the 550, so the 600s can just be a drop in replacement
To summarise, these are very nice motors given the price, but I believe these are 9V motors of a similar nominal power to a 550 (relying more on current than voltage for its power). Therefore when you overvolt them to 12V you get more power, as you would overvolting a 550 on 16V. It will definitely make Richie's lifter faster (dunno about extra lifting power yet..), but that's only if they don't catch fire first... I will try installing one over the Christmas holiday.
Last edited by Rapidrory; 5th December 2014 at 13:07.
They look pretty beefy and solid.
Can't complain for £3.50 each :P
I have a couple of those Johnson motors that i was planning on using with some drill gearboxes, wasn't convinced they'd fit in with the extra bearing support though. I'll be watching with interest to see if they are an improvement, nice cheap motors.
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