Clarke lathe service

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Subject Author Date
Clarke lathe service TT_Man 04-25-2008
Posted by Mark Rand on April 25, 2008, 6:23 pm
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>
>>>>I need to remove the main lead screw so I can get at the cross slide to
>>>>service it (backlash). I can't see how to separate the lead screw at the
>>>>drive end. There is a pin driven though the shaft but I can't move it. Is
>>>>it that and do I have to try harder?
>>>> TIA
>>>
>>>What Lathe?
>>
>> Err...one with a pin through its shaft?
>>
>> Regards,
>> Tony
>Clarke ( as per title) CL500M sorry for the omission.
>


Two thoughts:-
1) is it a taper pin? look at both ends to see if you need to drift it out in
the other direction.

2) Is it a mild steel shear pin that has been slightly distorted at some
point? If so, you may need considerable enthusiasm to remove it.

I would suspect number 1. But I've never had any experience with Chinese
lathes.


Mark Rand
RTFM

Posted by moray on April 26, 2008, 4:30 am
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>
>>>>I need to remove the main lead screw so I can get at the cross slide to
>>>>service it (backlash). I can't see how to separate the lead screw at the
>>>>drive end. There is a pin driven though the shaft but I can't move it.
>>>>Is
>>>>it that and do I have to try harder?
>>>> TIA
>>>
>>>What Lathe?
>>
>> Err...one with a pin through its shaft?
>>
>> Regards,
>> Tony
> Clarke ( as per title) CL500M sorry for the omission.

In that case it's a taper pin in that end of the sleeve, although there
isn't that much of a taper so you need to measure each end of the pin to
figure out which way to push it out.
On the leadscrew end of the sleeve, the only thing holding the leadscrew is
a keyway. The leadscrew should be free to float in and out of the sleeve,
but it usually is a bit tight, so may need a bit persuassion to get it out.



Posted by TT_Man on April 26, 2008, 5:33 am
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>>>
>>> Err...one with a pin through its shaft?
>>>
>>> Regards,
>>> Tony
>> Clarke ( as per title) CL500M sorry for the omission.
>
> In that case it's a taper pin in that end of the sleeve, although there
> isn't that much of a taper so you need to measure each end of the pin to
> figure out which way to push it out.
> On the leadscrew end of the sleeve, the only thing holding the leadscrew
> is a keyway. The leadscrew should be free to float in and out of the
> sleeve, but it usually is a bit tight, so may need a bit persuassion to
> get it out.
>
Thanks very much, I'll try that shortly. Saves me smashing hell out of the
pin... I can't measure each end because one end is buried. I suspect that is
the wider end though ( A guess).
I'll let you know how I get on.



Posted by Mark Rand on April 26, 2008, 6:25 am
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>>
>Thanks very much, I'll try that shortly. Saves me smashing hell out of the
>pin... I can't measure each end because one end is buried. I suspect that is
>the wider end though ( A guess).
>I'll let you know how I get on.
>


A Mk I eyeball is normally sufficiently accurate to tell which end is which on
a taper pin.

Mark Rand
RTFM

Posted by campingstoveman on April 26, 2008, 8:55 am
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Just been and removed my pin, its tapered and is 5.00mm at the narrow end
and 5.50mm at the other. A sharp tap and a good pin punch removed it.
If you want copies of Machine assembly drawings I can email them to you.

Martin P

>I need to remove the main lead screw so I can get at the cross slide to
>service it (backlash). I can't see how to separate the lead screw at the
>drive end. There is a pin driven though the shaft but I can't move it. Is
>it that and do I have to try harder?
> TIA
>



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