Re: D8R +463 in 1/5,6
 

Today's report
Decided to haul dozer inte workshop again for dismantel.
The good side, have done it some times now and is very easy to brake down into pieces.
The bad side, I hate oil, and oily you get. Always oil in all tubings, valves and that is coming out when you don't want to.

http://i1014.photobucket.com/albums/...ps1h1dgdbq.jpg
As you can see everything has to be removed, incl one side of track to get hydraulic motors out. The valves (with blue servos) will be removed and replaced.

Decided is to seperate the 2 drive circuits from rest of hydraulics (blade , ripper, 463). If that will make dozer run is to be seen. The other hydraulics will be a seperate system with electrical driven pump, smaller valves, same as you guys use for models with bigger demand like excavators. Supplier can be Premacon or Tobias Breaker. With this change a complete new tank (diesel in 1:1 machine) will be built with new pump and motor built in. This is needed anyhow if, IF dozer should be electrified in the future (should have done that from beginning :mad:)

A question for you used to build with electric motors. Any suggestion of supplier? The size and design on dozer requier 120Nm torque on each side and with a 1:4 reduction in hub results in a 30Nm (rpm between 80 and 250 for correct speed). 12V or 24V? Type of elec. control?
Space available is W 7,5" L 20-24" H 8" for everything incl battery.
Thanks in advance.
Dan

Re: D8R +463 in 1/5,6
 

Can you run the final drives with an electric motor/pump combination?

Re: D8R +463 in 1/5,6
 

Having 2 options now:
1-gas engine/hydrostatic drive as today + electrical driven pump for blade/ripper
2-electrical driveline (complete new) + electrical driven pump for blade/ripper
Option 2 will need more rebuild than no 1 of course, but have other positives like running inhouse (if there's a floor for a 500lbs machine with steel tracks)

If I can find suitable motors incl 90 degree gearbox within spec above, that would be a good solution.

Dan

Re: D8R +463 in 1/5,6
 

Hey Dan. I did a lot of research for drive on my 1/16th CHTZ T-800 dozer and went electric for all the reasons you are considering.
http://www.rctruckandconstruction.co...ad.php?t=11337

I chose 25amp (stall) car seat motors @ 12V. Of course yours is heavier than my 60lb weight model.

Have you considered 24V wheechair worm-drive gear-head 90 deg motors? They are very powerful and generally run around 100-200RPM which could be controlled with an ESC motor controller, maybe a Dimension Engineering 60Amp.

Like these on aliexpress:
https://www.aliexpress.com/item/2013...479201429.html

Or this type here:
https://www.aliexpress.com/item/250w...1-17b1309b4cc1


They have all the engineering data you'd need to assess them. You could gear them down easily with say 06B ISO or 08B simplex chain drive at say 4:1 or 5:1 which would provide an output speed at the sprockets of approx 30-40rpm and would be very powerful.

Re: D8R +463 in 1/5,6
 

It's been a long time with nothing happening. now I think it's time to finalize this build :)
My thought now is to make it electric drive and get a new smaller hydraulic system for blade and ripper (like Premacon).
Have checked a lot motors from China and most can not be fitted inside frame.
So, question to you guys, what's your expirience with using motors from drillmachines. Here's a picture of one possible motor, a Makita drill with a very powerful motor (up to 110Nm). Model needs 30Nm on each side to get a prototypical drawbar so there's some extra and motors do not need to go at maximum power. Will try use speed control and battery incl with drill.
Picture in next reply (due to slow loading)
Dan

Re: D8R +463 in 1/5,6
 

Re: D8R +463 in 1/5,6
 

https://scontent-arn2-1.xx.fbcdn.net...e7&oe=5C6EFF1D

I know some elect drills give a 2speed trans. If drill motors don't fit, i've also heard automotive Power Seat Motors can work pretty well

Cool project, that's pretty sweet.