Beginning Problems

[razerdave]

Re: Beginning Problems

Not really.

[gizz]

Re: Beginning Problems

The number of ampere a battery can deliver is dependant on the Ah / mAh rating times the maximum current draw C.
a 1ah battery with a 5c mark can deliver 5*1=5A at most

[roketrhino900]

Re: Beginning Problems

Thanks for all the info, I've got a slightly different question now.

I'm moving onto the drive, what do most people to mount the motors and for custom gear boxes? I'm looking at buying a load of HDPE, it's cheap stuff. I've looked at various build diaries, but can't find enough relevant information.
George

[Anttazz]

Re: Beginning Problems

Use a hole saw drill bit to mount the motor if you need to and I think the Golds have screw holes to mount from the front. Can't really remember now.

As for the second part of your question, I am confused, do you mean thicknesses of HDPE?

[maddox10]

Re: Beginning Problems

I'm moving onto the drive, what do most people to mount the motors and for custom gear boxes?

Team RCC feathers use the MSR 12-XX gearboxes (gearratio 4.5 or 6 to 1). Simple 1 stage dead axle setups. Steel gearbox plate with 5 holes in it. Speed 900 or equivalent. 12 or 15mm axle, bronze or whitemetal bushings. HDPE wheels.





Our new feather, Hannibalito 4, uses the Gimsons. I bolted these in a steel 40*40*2 L section as part of the T frame (another constant in the Hannibalito's)

I'm looking at buying a load of HDPE, it's cheap stuff. I've looked at various build diaries, but can't find enough relevant information.
George

High Density Poly Ethylene. Lighter than water. I use for calculations 0.97 kg dm³.

Very tough, virtualy unbreakable, but it can stretched untill breached.
But also soft, can be worked with wood-working tools.
The advantage here is that spinners slice a cut in it, and doesn't transfer the force as readely.

There is no glue for it.Paint peels off. Most chemicals don't even damage it. Only heat, intense UV and Benzene/Toluene/Xylene do that.

Due the softness, threading it is not optimal. Coarse woodscrews do the job, but are weak points. Ancient woodwork methodes that don't use nails or screws (dovetails, hole and dowel) are applicable with very good results. Pity there ain't a lot of good carpenters around here.

You can weld it with hot air, but the welds are weak points as these become a tad brittle. I learned to back up welds with angled metal combined with bolts and nuts.

Normal color is black or white, but colored in depth material is not unheared off.

For feathers.
For frame/monocoque 8mm is the thinnest I would use. The softness gives it a lot of flexibility. Polycarbonate is better in that respect.

10mm thickness protects against most spinners, 20mm seems unbreachable.
5mm is a fantastic dust cover. Team RCC uses it for bottom armor.

[roketrhino900]

Re: Beginning Problems

Thanks for all the info guys, I've made a 3d model on sketchup, I've bought 10mm HDPE for side armour, I'm using 3mm checkerplate ali for top, I've also bagged myself a Festo ram, I think its 60mm stroke 40mmbore is that OK? It weight 2kg, though.

I bumped this thread to ask about wire connectors, since I remember a discussion about them somewhere else. Are bullet connectiors OK, or will they fall apart?
Will my robot require a frame? The body is slightly lower than metalbeaks in proportion.

Thanks, George

[roketrhino900]

Re: Beginning Problems

I've got some thin steel bars I'm going to use, I've cut a 480X440mm base, it's wider than it is long because the ram is in parallel with the drive. I know rams are better upwards, but mine is in the classic setup because my mega ram would make the robot incredibly tall. I'll make a build diary and put up some photos once I start mounting stuff, I need some parts from southhampton first.