[chbot] Robin's window problem + cheap hydraulics

[Andy Gardner]

Forget the $500 pump.

One $3 cylinder connected via suitable lever to the window.
Another $3 cylinder located elsewhere connected to a lever which is 
driven by a system of ropes and pulleys by a electric motor.

Connect the 2 $3 cylinders together with a hydraulic line, bleed it, and 
Bob's your aunt's hubby.


On 20/09/22 18:34, Robin Gilks wrote:
> So $3 for the cylinder, $500 for the pump ;)
> 
> Think I'll investigate torsion bars a bit more (like you find opening
> a boot lid)
> 
> On Tue, Sep 20, 2022 at 1:50 PM Andy Gardner <ceo at andygardner.com> wrote:
>>
>>
>> Killing 2 birds with one stone here.
>>
>> Repco have got lots of clutch slave cylinders in their clearance items
>> for $6 or less...
>>
>> https://www.repco.co.nz/en/search?q=clutch+slave%3Amatching%3Alevel3Category%3A2538381394%3ApartSlot%3ACLUTCH%2BSLAVE%2BCYLINDER&page=1
>>
>> Robin might be able to use them in a design (with appropriate leverage)
>> that doesn't nut him when closed.
>>
>> The rest of you - I could think of a few applications for them such as
>> bed leveling.
>>
>> You can put 2 of them to use in a closed hydraulic circuit that keeps
>> something level as it is moved around - that's how the bucket in a
>> bucket truck stays level as the boom is moved up and down.
>>
>> If you look at a bucket truck there's a BIG hydraulic cylinder that
>> lifts the boom, but there's a smaller cylinder sitting there near it -
>> that's the bottom leveler. The top leveler is hidden inside the top of
>> the boom.
>>
>>
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