3-in-1 lathe

11 views
Skip to first unread message

Russ Garrett

unread,
May 31, 2011, 3:18:34 PM5/31/11
to London Hack Space, Simon Howes, spooq
The lathe is out of action. Kal left a note on it saying that the
(lathe) motor was making a strange noise.

I turned it on, and it was indeed sounding slightly unhealthy. I
unhooked it from the belt and ran it unloaded for about 5-10 seconds -
it started smoking slightly (!). I left it to cool and ran it again
for about a minute. The outside casing went from 40 degrees to 60
degrees during that time.

Next step is probably to strip it down and take a look inside, but it
may be that it's duff.

--
Russ Garrett
ru...@garrett.co.uk

Kal

unread,
May 31, 2011, 6:34:02 PM5/31/11
to London Hackspace
Russ, thanks for confirming that. This was the first time I used the
lathe unsupervised so I was extra careful and successfully used it for
a few hours. After a brief pause to look at the workpiece I started it
again and straight away stopped it because of the noise. There really
was no indication that there was a problem before that point....

I thought I'd just give a bit more of an explaination, incase that it
is helpful.

Mark Steward

unread,
May 31, 2011, 7:50:00 PM5/31/11
to london-h...@googlegroups.com
On Tue, May 31, 2011 at 11:34 PM, Kal <lamb...@gmail.com> wrote:
Russ, thanks for confirming that. This was the first time I used the
lathe unsupervised so I was extra careful and successfully used it for
a few hours. After a brief pause to look at the workpiece I started it
again and straight away stopped it because of the noise. There really
was no indication that there was a problem before that point....

I thought I'd just give a bit more of an explaination, incase that it
is helpful.



Simon Howes

unread,
Jun 1, 2011, 3:32:56 AM6/1/11
to london-h...@googlegroups.com

The lathe motor normally gets a bit warm in usage
You need to not overtighten the belts on the lathe pulley-train. This will cause the motor top bearing to overheat.

But something may be wrong - I'll take a look at it....

Russ Garrett

unread,
Jun 1, 2011, 3:55:15 AM6/1/11
to london-h...@googlegroups.com
On 1 June 2011 08:32, Simon Howes <simonh...@googlemail.com> wrote:
> The lathe motor normally gets a bit warm in usage
> You need to not overtighten the belts on the lathe pulley-train. This will
> cause the motor top bearing to overheat.

I ran it again for about a minute last night, after my previous email,
and it started smoking after about 30 seconds - there's definitely
something wrong with it (the belts weren't too tight). I'll email
Chester.

--
Russ Garrett
ru...@garrett.co.uk

Simon Howes

unread,
Jun 1, 2011, 5:08:34 AM6/1/11
to london-h...@googlegroups.com

How did the motor feel when you turned it by hand?

Russ Garrett

unread,
Jun 1, 2011, 5:20:54 AM6/1/11
to london-h...@googlegroups.com
On 1 June 2011 10:08, Simon Howes <simonh...@googlemail.com> wrote:
> How did the motor feel when you turned it by hand?

Pretty smooth and free, it didn't feel like the bearing was a problem.
Makes me think that there's something wrong with the windings.

--
Russ Garrett
ru...@garrett.co.uk

Russ Garrett

unread,
Jun 1, 2011, 7:48:01 AM6/1/11
to london-h...@googlegroups.com
On 1 June 2011 10:20, Russ Garrett <ru...@garrett.co.uk> wrote:
> On 1 June 2011 10:08, Simon Howes <simonh...@googlemail.com> wrote:
>> How did the motor feel when you turned it by hand?
>
> Pretty smooth and free, it didn't feel like the bearing was a problem.
> Makes me think that there's something wrong with the windings.

Chester sent me this satisfyingly concise email:

"Possible causes for motor running hot
Elec: capacitor(s) u/s, faulty centrifugal switch, switch gear
faulty/reduced voltage,
Mech: faulty bearings, drive belts to tight.
Regards"

I'm fairly sure it's not the belts (I don't believe it's that easy to
get them excessively tight) or the bearings (because they felt fine),
so it looks like we probably need to strip the motor down and take a
closer look.

--
Russ Garrett
ru...@garrett.co.uk

Sam Cook

unread,
Jun 1, 2011, 7:58:44 AM6/1/11
to london-h...@googlegroups.com
I'm fairly sure it's not the belts (I don't believe it's that easy to
get them excessively tight) or the bearings (because they felt fine),
so it looks like we probably need to strip the motor down and take a
closer look.

Surely testing the belts would be quick and worth checking anyway?

Adrian Godwin

unread,
Jun 1, 2011, 8:07:42 AM6/1/11
to london-h...@googlegroups.com
Are the motor bearings sealed types, or do they require occasional oil ?

-adrian

Russ Garrett

unread,
Jun 1, 2011, 8:16:16 AM6/1/11
to london-h...@googlegroups.com

Well I popped them off and on again a few times last night in the
purpose of checking it.

--
Russ Garrett
ru...@garrett.co.uk

Simon Howes

unread,
Jun 1, 2011, 8:29:09 AM6/1/11
to london-h...@googlegroups.com

Hi peeps,

Niels and I did a quick check of this today - the motor seems to be turning smoothly and you can just hear something scraping when you spin it fast so i suspect the centrifugal switch may be at fault.

We've left the motor out and placed it on the bed of the lathe with some bolts to just hold it from tipping. Dont try running it without firmly securing it down to the bed.

Guess we need to open the motor...

Russ Garrett

unread,
Jun 1, 2011, 8:37:24 AM6/1/11
to london-h...@googlegroups.com
On 1 June 2011 13:29, Simon Howes <simonh...@googlemail.com> wrote:
> We've left the motor out and placed it on the bed of the lathe with some
> bolts to just hold it from tipping. Dont try running it without firmly
> securing it down to the bed.

I'd recommend not running it at all until we've looked inside. I
suspect any runtime is going to be cooking the starter winding.

--
Russ Garrett
ru...@garrett.co.uk

Glen

unread,
Jun 2, 2011, 10:59:12 AM6/2/11
to London Hackspace
Is the lathe not under warranty? If so I don't think we can rebuild
the motor and ask for a replacement.

Until we have a replacement of a fix I'd like for the motor that runs
the drill to be used to run the lathe.

Glen

Russ Garrett

unread,
Jun 2, 2011, 11:04:21 AM6/2/11
to london-h...@googlegroups.com
On 2 June 2011 15:59, Glen <glen....@gmail.com> wrote:
> Is the lathe not under warranty? If so I don't think we can rebuild
> the motor and ask for a replacement.

There is a 12-month guarantee, but Chester have asked us to strip it
down first to see what's wrong. It's not a sealed unit, and if we can
more accurately identify the defective part it'll save us on shipping
it back to them.

> Until we have a replacement of a fix I'd like for the motor that runs
> the drill to be used to run the lathe.

They're different models of motor.

--
Russ Garrett
ru...@garrett.co.uk

Simon Howes

unread,
Jun 2, 2011, 11:06:26 AM6/2/11
to london-h...@googlegroups.com

I'll be taking a look at the motor tonight - if its simple then I'll fix it otherwise we need to get a replacement. I'm not intending to rebuild the motor.

It seems the motors are also not the same - please do not try and swap them about.

Btw: the piece at the top is called the mill. Not the drill (though it can do this)

Reply all
Reply to author
Forward
0 new messages