Lathe chuck backstop for dummies

[Gerhard Olivier]

Thanks to Bogs I now know whan a backstop does and how it works AND I WANT ONE

I dont have any morse taper blanks and my topslide travel is to short to make one without a lot of luck involved.

The other way mentioned looked like I would be able to manage

So I need a expanding collet that fits the wrong end of the headstock spindle.

25mm MS + lathe +
+Slitting saw

=

This has a 12.5mm bore right through and a low angle taper at one end


Then the Tapered locking bolt needs a Outer thread 12mm *1mm pitch and a inner 8m thread


And ready for parting ( taking it out to the garagde and cutting it with the hacksaw)  Parting noise wakes kids


The setup on a piece of 8m studding just needs a 12mm *1mm closing nut and some accesories - like delrin spacer to keep it from rattling and maybe a flat end for the material to rest on.



Enough for tonight

Hopefull more tomorrow

Gerhard

[sbwhart]

Nice bit of machining Gearhard  is that a c4 indexer your using ?.

Looking forward to next installment 

Have fun

Stew

[bogstandard]

Nice one Gerhard,

It should work just fine.


Bogs

[Gerhard Olivier]

HI all

Thanks Bogs , Stew and Im not sure what it is called its a spindex takes 5c collets and Im working it with a 5c to er35 adapter.I got it cheap at the mod eng show.

Just need a little knurling and some small bits then I can start with the saddle stop- maybe do a multy stop rotating index.

Gerhard

[Stilldrillin]

Well done Gerhard...... 

David D

[Gerhard Olivier]

Final parts done

Thanks for comments

Made the Knurled locking nut



And then assembled the lot -wont tighten as it just slips.
 Need something to stop rotation.
So I tapped a m6 tread in the outer sleeve and a 2mm groove in the inner.Then I cut a m6 allen bolt down to lenght and lathed a  2mm end.



This all assmbled well and stopped the rotation.



The whole lot together



And relative to the headstock lenght  the delrin spacer is just to keep things concentric but i dont think it is essential.




And fitted to the lathe -



Next I need a Saddle stop.

Gerhard

[bogstandard]

That really is a nice job you have done there Geroli.

I will have to get one made for mine now, as I can definitely see the advantage of one of these for longer stock turning, just as John Hill suggested.


Bogs

[arnoldb]

Good job Gerhard   

  Arnold