You should be OK going from 18V to 22.2V (more when freshly charged of course), just ensure there's good airflow around the rear of the motor and if you're worried about current spikes damaging your circuitry then you could fit some fuses.
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You should be OK going from 18V to 22.2V (more when freshly charged of course), just ensure there's good airflow around the rear of the motor and if you're worried about current spikes damaging your circuitry then you could fit some fuses.
Taking a step back to the GR01's, could you run a single motor off one of Botbitz 25A escs? The voltage and ampage seem fine but I am just interested in a second opinion as they say they detailed as beetle controllers.
ScotBots are having trouble running anything off of them. When they do work they've worked fine for drill motors on 12v though, the motors cook long before the ESC does.
I couldn't say an absolute yes or no as I've never used them, it's also difficult to know whether the 25A rating is a realistic continuous capability or just the 'hobby' rating. This is especially true as the controllers are changed from brushless to brushed so are using fewer of the fets for switching and to dissipate heat. Then again the 85A brushless > brushed controllers have proved to be very hard wearing indeed.
reading the posts on hacking it seems that the TZ85A are robust and the hack is mature
The 25A there seems to be more variety of devices and s/w is not as mature
The BotBitz BB25A-esc I have used in Eclipse seems not as capable nor sturdy as the TZ85 units.
If used in a robot I advice rigorous shock mounting and hotglue to secure the large caps.
24V 'Speed 550' Motors and 24V GR02 sets are now available through the website. As you will notice there are still further images and content to come but key product details are all there.
The 24V 24:1 ratio GR02's in particular would make top-class drive motors for featherweight robots with wheels up to 100mm, the higher operating voltage meaning power output and efficiency will surpass any normal drill motor while the gear ratio enables impressive top speeds.
If you've got any questions please let me know.
Your website appears to be down Ewan, if you don't know.
That's odd, still not working for you? I've not noticed any downtime and my host hasn't reported any faults today.
Works fine for me
It's fine here too. Think it might be you Alex! :P
Works now... no idea what that was; said it could not locate the server.
Ewan
I was wondering if it would be a good idea, if you made available freewheel mounts made up of some of the bits you use for the GR02 drives so if some one wanted a robot with 2 wheels driving but wanted 1 or 2 wheels to stop the back of the robot dragging on the ground. They could get the wheels mounted on a free wheel hub made of the shaft bearings and gearbox shell. this would mean the fitting of the freewheel wheels would be as easy as the fitting of the motors. this would make robot construction easy.
What do people think?
That would be great! I have been planning to switch to the GR02's at some point but only run 2 with belts to drive the front. If he does that then I wont have to make custom mounts.
Sell the gearbox cases on their own. I have plenty of drill motors but the plastic gearbox is the weak point.
I'll certainly look into the freewheel mounts - for the front section of the gearbox, second bearing with housing plus shaft you'd be looking at around £12. I've got lots of other work on at the moment though so can't promise this as a product option any time too soon.
Gary, I am somewhat reluctant to sell the gearbox housing separately as it doesn't fit all small drill motor ring gears (most I've used in the past have a larger outer diameter and simply wouldn't fit the mounts without re-cutting), nor does the motor mount fit all 550 motors without increasing the central bore. There comes a point when I can be offering too many product options and if they're not all compatible with one-another then there'll be problems. So maybe in future, not for now.
Hi Ewan
http://www.technobotsonline.com/bear...ng-blocks.html
The bearings from Technobots (link above) come in at £10 so around £12 for the mounts with shaft would seem reasonable. I think no one would think this too expensive.
I agree, that sort of price point seems good
I would like to point out the free wheel hub is just an idea, :idea:
and Ewan dose not have to follow through or even comment on it.
I don't want to railroad anyone into doing anything they don't want to do, or don't have time to at the moment.
We must not forget, Gimson robotics is Ewan's business, :D
The hubs will be reasonably priced when they're available! :P
Pictures of the 24V GR02 are now up
http://www.gimsonrobotics.co.uk/prod...r-overview.jpg
thanks Ewan, keep up the good work
Still contemplating buying some shafts and bearings to make up some freewheel mounts
Might order some shafts to have a play with
Oh missus....Quote:
Originally Posted by shakesc
Out of interest how much do the GR02s weigh? I can't seem to find it any where. Thanks
Weight: 440g (excluding optional leads and fixings)
Quote:
Weight:450g (excluding optional leads and fixings))
Awesome thanks! That's brilliant! Lucky it's lighter than planned!
Do you think 24v gimson motors with 36:1 gearboxes will be ok with 150mm wheels?
I shouldn't see why not. All metal gears so the gearboxes should be fine. Might get a bit hot at the end of a battle but I can't see it being an issue
You should be OK, make sure the wheel doesn't overhang the shaft too much though, or if it does make sure you add some more support.
The high force GLA6000 model actuators are now reduced to clear, these would make a decent drive for a heavyweight self-righter or perhaps a featherweight grabbing/crushing arm when run at 24V or higher.
http://www.gimsonrobotics.co.uk/prod...-overview2.jpg
Just had my order arrive and I am very impressed with the speed and packaging of the parts, nicely done Ewan.
Thank you for the kind words, glad to be of service!
Hi Ewan, we will be buying the bits needed to convert a 36:1 drill gearbox to 24:1, maybe a spare 18v motor, and definitely one of the 18v GLA-S actuators in the near future. Do you post to Spain?
Thanks.
I'm sure he does but if he doesn't if you send them to me i'll fwd them on or bring to champs.
If not then forwarding would be very much appreciated, thanks! Bringing to the champs would be alright, but they're slightly for a robot competing on Saturday, haha.
Hi Ellis, yes we do, all the information is available here: http://www.gimsonrobotics.co.uk/interna ... pping.html 'Shipping within the EU' being the one you're after
Shaft mounting hubs are now available for the GR02
http://www.gimsonrobotics.co.uk/prod...mp-picture.jpg
Those more eagle eyed amongst you will notice they are similar to 12mm CNC supports but have an added M5 set-screw. The set screw will prevent rotation when used with a shaft flat while the split-section clamp should further prevent movement along the shaft.
This hub provides a straightforward way of mounting wheels like those in the banebots range, all you need to do is drill out a plain-bore centre to 12mm and add two holes for the mounting bolts to pass through from the hub.
quite cool just ordered 2 thanks
Glad I could inspire :wink:
viewtopic.php?f=111&t=5549
Like the extra set screw
Ewan, I am looking at having a 20mm Banebots hub on the shaft of a GR02 followed by a 15mm wide pulley. There is not enough length in the main shaft to have them on there together
So, would it ever be possible to order a GR02 without the 3/8ths thread on the end but to keep the internal Left Hand thread? I am guessing that you do all the fabrication so could just not do that with a couple of shafts and sell them as custom parts; but I may be wrong.