Hi m c, I was going to telephone flowfit to ask their advice, a lot of helpful information from your side, thank you, I hope it’s just getting the right configuration but I am sure these guys shall be able to tell me what is going to work and not work!You could probably get away with a basic two speed setup then.
For motors, you'll need to do some calculations.
Something like a 16cc displacement basic gear pump/motor https://www.flowfitonline.com/categ...roup-2-gear-motor-reversible-16cc-elbow-ports would give ~50Nm at 180bar (this was the first online calc I found - https://www.hk-hydraulik.com/en/hydraulics-calculator ), but at low speed efficiency will be pretty horrendous.
Whereas something like a 98.6cc FPPM motor https://www.flowfitonline.com/produ...l-keyed-shaft-2-hole-mount-high-pressure-seal would give over 400Nm, and be better suited to low speed.
But then you need to balance that off against how much pressure/flow you're going to have.
I'd probably start by thinking about how much pushing/pulling force you'd like to have.
Then you need to work through the system to see what is feasible.
If know how much force you'd like, next figure out what the diameter of your track/drive sprockets are going to be.
You can then work out how much torque you'll need at the drive. You can then run some figures to see what displacement motors would work, and at what pressure.
Once you have the required pressure/displacement, you then need to think about speed/flow, which is where you need to work out what is possible from your chosen power source.
Once you have an idea of all that, you can think about control, which will likely cost you more than the motors and pump.
