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Cross slide lock...

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John Hill:
My Chinese 12x36 lathe  (type CQ6230A-1) has a very unsatisfactory cross slide lock that consists of a grub screw pressing on the cross slide gib.  It is effective enough but it is in a very awkward place with the grub screw on the side of the cross slide right where it can not be got to if the tailstock is moved up.

So I thought of this modification which would put the adjusting screw on the top of the cross slide..



As you can see screwing down the top grub screw would force a ball between two others and hopefully put pressure on the gib.


Any comments before I start drilling holes in my lathe?

John

lordedmond:
John
Are you sure the gib bears on that face the normal way is on to the dovetail face not downwards

That face is normally the load bearing face

Stuart

allanchrister:
It's not clear from your sketch but it looks like there are 2 gibs in place, the main one and a smaller one on the inside against which the BB's push.  Did you mean to put a slot in the top of the gib in which the 2 lower BB's rest?  If not, how is the outside BB retained?  It does look like a thread in the upper part of the gib, but it's not clear.

I think the concept is good and I trust the BB's are hard enough to resist any damage from the pressures involved.  Just meant to be some constructive observations........

John Hill:
Hi,  sorry for the poor diagram.  The shape between the gib and the balls is supposed to represent a bit of brass.


The idea is that pushing a ball down will tend to force the two balls apart.

awemawson:
John,

You may find a pointed grub screw more effective parting the two lower balls if you think of the angles involved.

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