Separate the needs.
Fore-aft is one part, coupling is another part, transmssion(belts) is another part.
Use HTD-8-30 mm belts, and suitable pulleys.
Make the assy with multiple 2-part discs in steel over the shaft(s), bolted together, with reamed holes and pins/drill rod/tgp bits for angular alignment.
This allows knocking-off the pins, unbolting, and removing any part, in 5-10 mins, without any major tools/lifts etc, and reassembly in 10 mins.
Put a thrust bearing on the assy, and another facing other way, hopefully with a guide pin and belleville spring for minor preload/axial thermal drift.
Test Your idea/assy in your mind.
Test it on the bench, while working, but not on the boat.
Test it in the boat.
Q.
How long does it take me to swap/repair component x, if I have a perfect spare ?
How hard/slow is it to put in a new drive pulley, belt, etc.
Also, Very Good Q.
Why dont You have 1-2 spare belts on the shafts already mounted ?
This would be for cruisers, not relevant here, but, ...
"I can only get the pulleys in 30-40-50 teeth, whatever, from stock. " At 500$ each in "whasuchistan".
But for the low price of 300-400$ extra or 1000$ total, +/-, I can get them in 2 weeks via dhl/freight/customs/slow boat with suitable baksheesh.
? How easily can You swap a pulley for another one ?
Why is it so hard and slow ?
Why don´t You have an exxentric built-in to adjust for this ?
Why don´t You have an exxentric built-in to adjust for other pulley sizes/belt lengths ?
Why did You not bolt the pulleys to flat plates, so a new pulley can be hand-drill mounted ?
I am pointing out typical issues that tend to crop up.
That can, mostly, be solved with 20$ in material, 2 hours machine shop work, if pre-built properly.
Eg. 2 discs faced/drilled/tapped with a locating pin, will repeat to better than 0.001" or 0.02 mm in radial and facial length.
But can be unbolted in the middle of the "xx"sea, with hand tools, and spare belts, pulleys etc. slipped on.
And an exxentric cam etc. can tension stuff, without needing tedious alignment.
In fact, with a bit of ingenuity, it would be easy to make an assy with levers that self-asembles or comes off, in less than 20 secs.
I am not familiar with "AMP motor" product but I do need advice on a similar project of how to go about coupling a 20HP motor to a propeller shaft.
My goal is to construct a hybrid electric drive for a 50HP Diesel so I need some kind of a mechanical arrangement which allows pulley coupling the motor to the prop shaft and also allows fore an aft movement of the prop shaft.
The mechanical arrangement also needs to handle the ahead and astern thrust loads when the pulley coupled electric motor is driving the propeller shaft while the Diesel gearbox is in Neutral.
Trying to avoid re-inventing the wheel since this sort of thing is already invented, I am sure of it.
So how does it work?Thank you in advance.
Ahmet
-- -hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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