Re: (ET) Anyone have Quick Change Electric String Trimmer, Hedge Clipper, Chain Saw, mini-cultivator, powered by Elec-Trak ?

[john <johnreinhard rochester rr com>]

Hi Tim,

Thanks for the perspective - I did not check motor speeds.  Hmmm.

I did end up cutting down the centrifugal clutch drum on a saw, & then 
turned it on a lathe - because one end is the slip coupler for the flex 
shaft. Did not figure out the other end - considering drilling through 
it and motor shaft and using split pin to attach.

I actually have a Ryobi 40V string trimmer, BUT it is the version that 
has motor down near ground - directly connected to string bobbin, NOT 
the interchangeable power head model that has the larger motor.

If you are correct about the 36V scooter motor turning too slowly to run 
string trimmer module, maybe the motor will still run the hedge clipper, 
and reciprocating saw fast enough.

I guess I just need to make it lock onto motor shaft and try out the 
different attachments.

John

On 10/14/20 1:43 PM, Tim Maxwell wrote:
> I considered the same thing several years ago but have yet to get 
> around to it.
>
> A motor from a kids scooter probably will not have the RPMs you need 
> to efficiently cut with a string trimmer head. An ICE trimmer engine 
> generally runs close to 10,000 RPM for the string head, about 3 times 
> the speed of the scooter motor. You may be better off salvaging the 
> motor from a 40v cordless trimmer.
>
> As far as the shaft coupler goes, the quick attach head I salvaged 
> toward the project had a centripetal (centrifugal?) clutch with the 
> flex shaft coupler on the "brake drum." If memory serves, the ID of 
> the drum was a press fit around a small pulley (or possibly a weld on 
> sprocket hub), so I planned to use that for the adapter.
>
> If you are looking for a tool to use more than the fun/challenge of 
> building it yourself, converting a 40v cordless attachment capable 
> trimmer to corded (Ryobi/Home Depot and Kobalt/Lowes offer them) may 
> be easier.
>
> IMO variable speed is nice but not necessary. If the speed is varied 
> by a trigger like an ICE trimmer, it will end up at full throttle most 
> of the time.
>
> Tim M
>
> On 10/13/2020 10:21 AM, john wrote:
> > I have an old 2 cycle engine (not worth fixing, EXTREMELY LOUD, when 
> > it ran) powered Troy-Bilt String Trimmer, which has a quick release 
> > coupler half way down the shaft, and allows other implements to be 
> > powered by same head.
> >
> > Also have a 36 DC PM motor (500W maybe) from old kids electric 
> > scooter / mini bike type thing. 
>
>
>
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