[chbot] slow motor

[Charles Manning]

I have not seen the mechanicals you're working with, but maybe something
like a drill and a screwjack would give you all the beans you ever need

https://www.window-openers.com/wp-content/uploads/2015/11/screwjacks-selection.png

You might even be able to knock something up using threaded rod etc.




On Wed, Nov 17, 2021 at 7:34 PM GRAHAM CHRISTIE <
development.engineering at xtra.co.nz> wrote:

> Hi Robin
>
> If you had the drill driving a small diameter shaft and rope,(I use 3mm
> for boats all the time Oborns Nautical or Burnsco)
> https://obornsnautical.co.nz/products/dyneema-double-braid-3mm?_pos=2&_sid=d79ef86f6&_ss=r
>
> And then run this through a pulley system, 2:1 or 3:1 or 4:1 just
> depending on how much you want to slow it down and increase the pulling
> force.
>
> I have done this in the past with a closed loop rope system so that you
> can drive it and pull in both directions.
>
> I personally use the little marine pulleys, but for cost pulleys can be
> made from just about anything.
>
> Regards
>
> Graham
>
>
> On 17 November 2021 at 19:10 Andrew Errington <erringtona at gmail.com>
> wrote:
>
> Depending on which part of the original motor assembly died could you
> combine the electric drill motor with the worm gearbox?
>
> If it's going too fast could you put a PWM speed controller on it?
>
> Andrew
>
> On Wed, 17 Nov 2021, 18:29 Robin Gilks, < gb7ipd at gmail.com> wrote:
>
> Greetings all
>
> I've followed up the suggestion of using a cordless drill for my low speed
> motor to substitute for a wiper motor..
>
> Investigation of 9.6, 12 and 18v drills that have gone the way of nicad
> batteries have shown me that they all spin way too fast and have nothing
> like the torque of a wiper motor.
> This is mostly due to the gearbox rather than worm drive the wiper motor
> has. The added advantage of the worm drive is that it can't (easily) be
> driven from the output side so no brake is required.
>
> So back to Monday night's question, does anyone have a wiper motor going
> spare? Permanent magnet (i.e. reversible) with a simple shaft out rather
> than an internal cam or crank..
>
> Cheers
>
> --
> Robin Gilks
>
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