Picture request: HW drivetrains

[daveimi]

Ok. Is it possible to fabricate cheap gearboxes using say pre-made Mod 2 gears?

[Gabe01]

I've used chains on three heavyweight robots and they always held up

[geeza]

Both gears and chains if done properly will work fine. And yes you can make gearboxes cheapish.

[maddox10]

Yes, that is perfectly possible, if you can buy the gears cheap. Know your way with bronze bushings and have a fair hand with a pillardrill and a good eye for marking the holes.

For a heavy gearbox, not to expensive I would use lasercut 5mm steel plates 15 and/or 20mm steel axles and bronze bushings.

In Bullfrog there is a version of that. Unfortunatly, we used custom made ali gears to get the weight down, and that blew the "cheap" to "barely affordable".

[daveimi]

Gosh those motors look pretty meaty! I will need to work out wheel size, desired speed, motor rpm and gear accordingly. Thank you for the info on everything, when people have used chains is there a pitch that's common on heavies or are they all different? Oh and do people ever use tensioners or if the tensions right are they unnecessary?

[calumco]

20131201_170307.jpg

dont really have anyother pics but u can get the idea, just 1 stage 4:1 i think roughly and seems great when i drove it about few weeks back.

made those gearboxes a few years ago now thou so i could do a fancier job if i was to do them again.

[maddox10]

Iskra AMG 24V 1200W. Good motors, but a tad heavier than the Bosch 750.
A 20-1 gearratio makes that Bullfrog wheelies like a dragster. And can do a fight with only 2Ah drawn from the batteries.

[daveimi]

They sound pretty torquey lol. Looks as thought it's going to be trusty wheelchair drive train for a bit