Eaton Model 7

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Eaton Model 7

This topic has 11 replies, 4 voices, and was last updated 23 October 2018 at 13:35 by Steve Addy.

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8 February 2016 at 00:07 #1495
Steve Addy
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@steveaddy35670
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8 February 2016 at 00:07 #224351
Steve Addy
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@steveaddy35670
Does anyone know how much torque is required to control the Eaton Model 7 Hydrostatic drive? I'm thinking Arduino, fly by wire controlled by a servo.

I have the manual for it and have searched the Net without success.

Steve
8 February 2016 at 04:41 #224355
Michael Gilligan
Participant
@michaelgilligan61133
Steve,

I am not familiar with the product, but I woke in the night & it looks interesting

**LINK**

Although they don't mention a contol torque, they do suggest a 100mm lever; so I would think that a Servo for a model yacht would be ample.

MichaelG.
8 February 2016 at 11:07 #224389
Steve Addy
Participant
@steveaddy35670
Hi Michael.

Your reply is appreciated.

I have the Model 7 fitted to the loco and the paperwork for it – I have even made the boss for the operating lever.

However, the only servos I have ever used are the standard type provided with a six channel RC outfit. I'll have to look up the figures for those, make a lever and buy a spring balance.

Steve
8 February 2016 at 11:25 #224396
Circlip
Participant
@circlip
M6 allthread as a leadscrew with a reduction gear threaded onto it driven from a small motor, Jockey block on lead screw to give linear pull. Got to be cheaper than a servo with "Muscle."

Regards Ian.
8 February 2016 at 11:46 #224399
Michael Gilligan
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@michaelgilligan61133
Posted by Steve Addy on 08/02/2016 11:07:07:

I have the Model 7 fitted to the loco and the paperwork for it – I have even made the boss for the operating lever

.

Steve,

A good alternative to the RC style Servo might be a Stepper Motor and toothed belt drive … Only a little more complex Arduino-wise.

MichaelG.
8 February 2016 at 13:28 #224416
Bazyle
Participant
@bazyle
sail winch servo, lever type. Cheaper ones available. Being an engineer you could use a rotary one and gears for even more torque.

Is the Arduino to give it some failsafe and automatic response to track signals? If plain RC checkout the loss of RF signal failsafe devices for planes and helicopters. Often thought 5in ground level could be fun with an RC shunter.

Since you have the device anyway it might be better to measure it running as any figures in the manual might be optimistic, not allow for old grease etc.

Edited By Bazyle on 08/02/2016 13:36:09
8 February 2016 at 20:18 #224489
Steve Addy
Participant
@steveaddy35670
Thanks again guys.

The idea of the Arduino is firstly that I know nothing about them and haven't written a program since the 80s.

I wish to make the loco work by using the gear levers in the cab and the throttle on the "backhead".

This would give the illusion of a mechanical gearbox with two speeds in forward and reverse. I would also like the engine revs to be beyond the control of the driver, determined by the gear position in forward or reverse with idle on neutral.

I haven't given it much thought yet, just weighing up what the servo might cost for starters. Standard servos I am used to are between 3 and 4 kilogram centimetres. I have just been looking up digital servos as I feared they needed a different control signal. It turns out this is down to internal pulses controlling the motor at 300Hz rather than 50Hz. They work on the same signal but have greater resolution and holding torque.

All interesting stuff.

Steve
24 February 2016 at 16:49 #226728
Steve Addy
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@steveaddy35670
I have now bought an Arduino and written most of the code and it happily drives a standard servo in place of the more powerful things which will be needed. I have an all aluminium, steel geared Savox servo of 30kg cm torque to put the engine throttle beyond the control of the driver.

I have written to Eaton in the US, who passed it on to the distributors here; I got a nice reply with the wrong answer. They are now referring the question back to America.

Will win eventually.

Steve
18 April 2016 at 21:47 #235183
Steve Addy
Participant
@steveaddy35670
Just sent a final email to the UK agents – I assume they never got a response from America. Two months have elapsed since I last wrote to them!

Steve
19 April 2016 at 23:25 #235346
Steve Addy
Participant
@steveaddy35670
Further to my post yesterday, I got a very quick response from the chap concerned. Apparently they haven't heard from Eaton in America, but they have some units to test for a commercial user, so they will include the operating torque as part of it. I will post the results here assuming I do receive them. Fingers crossed.

Steve
23 October 2018 at 13:35 #377239
Steve Addy
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@steveaddy35670
I never got a reply – fancy that!
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