Dozer Upgrade

[Rvjimd]

I want to upgrade my die cast dozer conversion and thought I might try replacing the track drive servos with right angle gear motors or maybe some DIY worm gear arraignment.

Anyone have a source for small right angle gear motors or worm and matching spur gears? I'm dealing with a small machine, so the typical windshield wiper style is going to be way too big. My two standard size servos just BARELY fit between the side frame rails.

I have seen this on servo city but it looks a bit to weak for my application.

https://www.servocity.com/html/140_rpm_right_angle_gearmotor_.html#.V36akPA8KrU

Jim

[Bo Wallen]

This got e few interesting parts. http://www.robotshop.com/en/motors-actuators.html

[Bo Wallen]

This one got it all.http://www.sdp-si.com/#slide-two

[Rvjimd]

Thanks Bo, lots of stuff to look at both places! Might be fun to try and build a gear box with right angle or worm gears.

I see on the second site they list the worm gears as right or left. Does that mean I should NOT try to turn them backwards for reverse gear motion of the dozer? I don't understand exactly how they work? I could probably use right angle gears. Is there a reason to use one vs the other is a setup like I'm planning?

Jim

[Bo Wallen]

You turn motor clockwise / right : if you want the result to be opposite use left turn and so on. If you use worm gears you got brake for free.

[Lil Giants]

You'll get additional reduction with a worm drive vs straight cut bevel gears in a right angle gearbox. But (maybe it goes without saying) precise centering of worm gear backlash over main gear can be difficult to achieve too.

[Rvjimd]

Has anyone ever tried to build/run a track machine with a single motor driving a differential and brakes for steering? That's how the full scale stuff works correct? Or at least the old time stuff I think?

Jim

[bigford]

my old tamiya sherman tank is like that. its real jerky
like jam on the brake ans swing left...

[Jack3M]

Has anyone ever tried to build/run a track machine with a single motor driving a differential and brakes for steering? That's how the full scale stuff works correct? Or at least the old time stuff I think?

Jim

Actually I think it is slipping clutches over braking

[bigford]

http://i1335.photobucket.com/albums/w671/bigford550/Mobile%20Uploads/20160710_121644_zpscihi4bho.jpg (http://s1335.photobucket.com/user/bigford550/media/Mobile%20Uploads/20160710_121644_zpscihi4bho.jpg.html)
http://i1335.photobucket.com/albums/w671/bigford550/Mobile%20Uploads/20160710_121621_zpsz4lf3v0h.jpg (http://s1335.photobucket.com/user/bigford550/media/Mobile%20Uploads/20160710_121621_zpsz4lf3v0h.jpg.html)