[modeleng] Re: Locking a lathe spindle

Hi there Ron,

Just a thought, but given that you are wanting to do a slotting operation 
- do you need to lock the lathe spindle - can you instead lock the 
conponent which you are slotting that you are holding in the spindle, 
maybe by using a modified fixed steady, or by using the tailstock in some 
way?

Note that if you are doing this, you should make sure that you are either 
not generating any force which will tend to rotate the spindle when you 
take the cut, by using the style of cutting tool you might find on a 
shaper, and gradually deepening the slot. Alternatively if you are 
widening the slot, which will tend to try and rotate the chuck, best make 
sure you aren't putting the forces through your locking mechanism which 
will damage the lathe - for example, the tailstock is only meant to react 
the forces from the cutting lands on the outside of an item which is of 
drill bit diameter, not something which is lathe chuck diameter. (I got 
given a lathe which was owned by my grandfather - it has received a 
'fatal' twist at some point in it's life - it now serves as an ornament in 
my office. Wouldn't want you to end up with an ornament!).


Yours,


Rich.

On Wed, 31 Oct 2007, John Pagett wrote:

> Ron,
>
> I presume that engaging the back gear without releasing the normal drive
> still has too much backlash?
>
> As an alternative, can you make an expanding device to grip inside the
> spindle - like the sort of thing people make for winding the chuck round by
> hand? There may be a chance to put an arm on it at the changewheel end and
> lock that to something.
>
> JohnP
> ----- Original Message -----
> From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Wednesday, October 31, 2007 7:56 PM
> Subject: [modeleng] Locking a lathe spindle
>
>
> Calling all Myford owners....
>
> Does anyone have any good ideas for positively locking the spindle, while I
> carry out a slotting operation?  The Super 7 comes with a spindle lock of
> course, but this only locks in one position, and in any case there is a
> small amount of backlash with the lock engaged.  What I am thinking of is
> some sort of friction device, which can effectively hold the spindle in any
> position.
>
> Anybody been there before?
>
> Regards
> Ron
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