mini lathe status? - London Hackspace

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Message from discussion mini lathe status?
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Date: Wed, 03 Oct 2012 08:45:46 +0100
From: Eugene Nadyrshin <menta...@gmail.com>
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To: london-hack-space@googlegroups.com
Subject: Re: [london-hack-space] Re: mini lathe status?
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Billy, I went through the mailing list looking for updates but didn't 
come across your one as it was deep in a thread about the big lathe, 
thanks for looking into it. I think it's generally a good idea to put 
this info on the wiki mentioning the current status, so whoever wants to 
use it can see what's happening on the wiki and is more inclined to do 
something with it.

As for the uneven wear I think I know why that is. The motor is bolted 
on to lathe body using 2 bolts on the same side of the motor. The bolts 
are terminated through 2 vertical slits, probably to allow for 
tightening of the drive belt, which, because of the design will cause 
the commutator side of the motor to push downwards when taught. However 
the motor has 3 options for alignment of the brushes so my guess is that 
if they are are aligned horizontally they should last longer.


On 03/10/12 08:03, Billy wrote:
> I put a status update for the minilathe in this thead,
> https://groups.google.com/group/london-hack-space/browse_thread/thread/31780eafa11a8acd?hl=en-GB#
>
> Post i put then said,
> "I've been digging for a replacement motor for the mini-lathe.
>
> I can't find one on Arc Euro's website. And all of the other googling
> i've done just gets chinese knock-off's of varying quality.
>
> Looking for the different failure modes, and i found the problems with
> the motor brushes. They're sacrificial and easily replacable.
>
> Opening our motor up and the brushes are donald. There's an
> interesting wear pattern, where one of the brushes is a third of the
> size of the other one. Implications include off-centering of the
> armature, that might require replacement of the motor in the long run.
>
> Replacing the brushes is the quick, simple and cheap option. It may
> not be the full solution to the problem, but it's worth a try.
>
> Arc Euro don't list our exact motor, so the replacement brushes that i
> found here, http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/C3-Mini-Lathe-...
> may work, but they may not be exactly the ones we need.
>
> Could someone order them, and i'll fit them... "
>
> To repeat the request, could someone order them...
>
>
> On 3 Oct, 03:38, "Peter \"Sci\" Turpin" <s...@sci-fi-fox.com> wrote:
>> The control potentiometer used to be a bit flakey, may be that the lower
>> portion of the pots range's gone all together.
>>
>> On 03/10/2012 01:17, Eugene Nadyrshin wrote:
>>
>>
>>
>>
>>
>>
>>
>>> Last updates on the mini lathe are 3 months old saying that it needs to
>>> have it's motor replaced. As it's taking space and does not have a do
>>> not hack sticker attached I've taken the liberty of checking the motor
>>> along with James, who inquired about the mini-lathe.
>>> Coils fine, commutator covered in a beefy layer of carbon, one brush
>>> almost gone. Replaced the brush with a smaller one from a one of the
>>> motors in the "motors" box, cleaned the carbon residue off the
>>> commutator and it works, sort off. The speed controller only works for a
>>> small range and the speed is constant after about 20%, this could
>>> of-course be due to a brush that wasn't meant for it. I'd still advice
>>> people against using it just yet, but if someone who has seen it working
>>> before the fault can take a look and confirm that it's not behaving
>>> properly that would be great.
>>> When I'm in next I'll take a look at the motor model number and see if
>>> we can order the right brush. If someone else wants to do that sooner,
>>> even better.
>>> Mentar
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