Dozer Upgrade

Rvjimd · #1 07-07-2016, 02:09 PM

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_r...l#.V36akPA8KrU

Jim

Bo Wallen · #2 07-07-2016, 02:14 PM

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

Bo Wallen · #3 07-07-2016, 02:16 PM

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

Rvjimd · #4 07-07-2016, 02:27 PM

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 · #5 07-07-2016, 02:33 PM

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 · #6 07-07-2016, 08:12 PM

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 · #7 07-08-2016, 10:24 AM

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 · #8 07-08-2016, 11:24 AM

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

Jack3M · #9 07-10-2016, 11:52 AM

Quote:

Originally Posted by 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

Actually I think it is slipping clutches over braking

bigford · #10 07-10-2016, 12:28 PM

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