Hi I still don't know how to get pictures on this new forum seems so complex to an old man!
Anyway some pictures of the work done on seraph and it is now ready for BH
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Hi
I have the details for the Drive gearbox and the lift motor.
The Gearboxes for the wheel drive are made by a company called, Pujol from Spain.
The model number is LAC40/10/120-11.
Ratio 10:1
Let me know if you find a supplier as I may need spares one day
The motors are Bosch 750W 24V.
The motor gearbox for the lifter is from a stair lift.
Made by Electric Motor Developments. EMD
The model number is PM63/50-VC24-GB2-75-1BK
RPM 37, the final drive via chain is reduction 2.5:1
This gives the total drive ratio as 187.5:1 reduction, lifting arm length 250mm
This is the same manufacturer for the motors in Seraph, Pilgrim, Spiderbot and the weapon motor in Gabriel.
Worm drive Gearboxes are very bad as far as efficiency is concerned I would think this one is no more than 45% but the advantage is the capacity to handle loads of torque in a small box and most of all for this application they can't be "back or load driven" so no need for a brake.
Hope the info helps
Urgent dose anyone have one or two of these chargers I could buy for next weekend as this one let out magic smoke this morning. One of the FETs has gone.
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I'm looking for a 12V 400w or more power supply for my charger any one know of a good supplier for this as Hobbyking only stocks them in the USA!!!!!
Yes they are I don't know how good they are going to be as they aren't used much this side of the pond. The specification looks OK.
24v motor no load speed at the drive coupling is nearly 250rpm with a reduction of 20:1 this gives a motor speed of just under 5000rpm! the gearbox innards look like they can take some stress but you don't know till you try to break something I am fitting a 20 tooth sprocket to connect to the 40 tooth sprocket on the hubs, this will give them a reduction of 40:1 (Saint has about 34:1 at the moment)
they are to go into either Saint or Gabriel. the only thing to watch with these motors is they have very thin bolts holding the motors together so I will have to support the end of the motor somehow. If you don't try you won't know.
I have been doing a little bit more on the pneumatic walker project.
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As you can see on the above picture the actuator basic size has been fixed at about 80mm long in total this gives an unloaded contraction of just over 10mm. the actuator is anchored via 8mm bolts one of them has a hole drilled through for the pneumatic fitting this makes the construction of the actuators simple.
the problem I still have to address is the air leaks where the clips are they aren't big, but I have to reduce leaks to a minimum to get the robot to move at any useful speed.
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The valves I hope to use are 5 way with an actuating arm on the top, like a micro switch. The main reason for this is speed, the gait time should be less than one second I don't think a solinoid v/v will like operating 300 times in one fight!
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The compressor has been stripped down and a pressure control switch fitted I don't like the arrangement at the moment as the relay tends to feather causing it to get hot more work needed on this I think.
With Gabriel required to do fights one after another I decided to try a different manufacturer of LiPo battery.
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Naturally the connectors on the packs were different too so conversion tails had to be made up.
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The specification of the two battery types are as follows:-
4 off Nano Tech A-spec 2.2Ah 6s 65c 130 max charge at 10c 8.8Ah pack.
2 off Opti Power 5.0Ah 6s 30c 70max charge at 3c 10Ah pack.
The Nano Tech batteries were significantly cheaper (even with the discount from Opti power!) and the total amps capacity if you believe the figures is well over 1000A short burst.
Also the charge capacity is 10c this means you can push 500w into the battery when charging! I have charged these batteries with "Brutus" then I put 400 watts into one of them no problem!
The Opti Power batteries have a greater capacity so they should last longer and I can then do 2 fights, between charges if this is true then they will be worth it. but believe it or not on these figures I will have to turn Brutus down on the Opti Power batteries even though they are over twice the capacity! so charging will be a little slower.
I have to say at the moment the Nano Tech batteries have proven themselves to be quite good, I don't have any qualms about getting some more of the same.
I wait to see if Opti Power proves to be the better battery.
Burgess Hill is coming up lets see how the new batteries work out
Last edited by craig_colliass; 28th March 2015 at 08:52.
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