MadModder

Gallery, Projects and General => How to's => Topic started by: Gerhard Olivier on August 26, 2009, 05:40:56 PM

Title: Lathe chuck backstop for dummies
Post by: Gerhard Olivier on August 26, 2009, 05:40:56 PM

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 +(http://i608.photobucket.com/albums/tt161/geroli/DS4.jpg)
+Slitting saw (http://i608.photobucket.com/albums/tt161/geroli/DS5.jpg)

=(http://i608.photobucket.com/albums/tt161/geroli/DS6.jpg)

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
(http://i608.photobucket.com/albums/tt161/geroli/DS7.jpg)

And ready for parting ( taking it out to the garagde and cutting it with the hacksaw)  Parting noise wakes kids
(http://i608.photobucket.com/albums/tt161/geroli/DS8.jpg)

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.

(http://i608.photobucket.com/albums/tt161/geroli/DS9.jpg)

Enough for tonight

Hopefull more tomorrow

Gerhard

Title: Re: Lathe chuck backstop for dummies
Post by: sbwhart on August 27, 2009, 01:16:43 AM

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

Looking forward to next installment  :thumbup:

Have fun

Stew

Title: Re: Lathe chuck backstop for dummies
Post by: bogstandard on August 27, 2009, 02:48:03 AM

Nice one Gerhard,

It should work just fine.


Bogs

Title: Re: Lathe chuck backstop for dummies
Post by: Gerhard Olivier on August 27, 2009, 04:42:03 AM

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

Title: Re: Lathe chuck backstop for dummies
Post by: Stilldrillin on August 27, 2009, 04:47:21 AM

Well done Gerhard......  :clap: :clap:

David D

Title: Re: Lathe chuck backstop for dummies
Post by: Gerhard Olivier on August 28, 2009, 01:34:37 PM

Final parts done

Thanks for comments

Made the Knurled locking nut
(http://i608.photobucket.com/albums/tt161/geroli/DSC_0002-1.jpg)


And then assembled the lot -wont tighten as it just slips. :(
 Need something to stop rotation. :smart:
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.

(http://i608.photobucket.com/albums/tt161/geroli/DSC_0004-1.jpg)

This all assmbled well and stopped the rotation.

(http://i608.photobucket.com/albums/tt161/geroli/DSC_0005-1.jpg)

The whole lot together

(http://i608.photobucket.com/albums/tt161/geroli/DSC_0007.jpg)

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

(http://i608.photobucket.com/albums/tt161/geroli/DSC_0003-1.jpg)


And fitted to the lathe -

(http://i608.photobucket.com/albums/tt161/geroli/DSC_0006-1.jpg)

Next I need a Saddle stop.

Gerhard

Title: Re: Lathe chuck backstop for dummies
Post by: bogstandard on August 29, 2009, 05:24:41 AM

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

Title: Re: Lathe chuck backstop for dummies
Post by: arnoldb on August 29, 2009, 09:52:33 AM

Good job Gerhard  :thumbup:  :clap:

 :beer: Arnold