Myford lathe indexing attachment (head stock)

[RobWilson]

Hi All

I started this project over a year ago though you may like to see it

more tooling , a indexing attachment for the Myford lathe. The indexing atachment was designed by J.A.Radford and i am working from his artical in Model Engineer 5 Jan 1968 (great year)
I thought i would get the worst job out the way first ,the Index plates ,all those holes . I started with some 10mm plate .



Then i turned up a mandrel ,to mount all four the plates to turn the O/D


Then each plate was mounted and the edges chamferd


The original design call's for a set of 4 plates 7 set of holes on each, just short of 1500 holes , FAR FAR TO MANY HOLES, so after some thought ,i decided to cut the number of plates to 2 with 9 sets of holes and only 525 holes , i wil not be able to index 73,119 173 and other daft numbers , i can live with that.
On the other end of the mandral i turned up an expanding mandral to hold the plates for drilling.




The other side ,lots of deburing to do

Still some numbers to stamp on the plates

[RobWilson]

Next up the spindle ,in SS, i used a swam neck tool i made for the threading and 16 DP worm ,,,lost previously made tool ,,,,,, ended up having to cast up a quadrant to get the 16DP lead screw gearing .

Swan neck tool



Quadrant


The SS spindle was turned up between centres .
First the 16DP worm



Then the worm end was finished


the spindle was then turned around and the rest of the machining carried out .I used a bit of old copper tube ,split to protect the work.



ruffing the spindle to size .


Then finish turned and the threads screw cut.




Rob

[doubleboost]

Rob
That is machining
Even the swarf looks good

[EdK]

Rob,

Talk to me about that swan neck tool. I'm not familiar with it.

Really nice machining.

I need to get one of your shiny metal cameras like you have and the one you gave Dave.

Ed

[RobWilson]

(05-18-2012, 05:14 PM)EdAK Wrote: Rob,

Talk to me about that swan neck tool. I'm not familiar with it.


Ed

Hi Ed ,,,,,, swan/goose neck tool is old school technology (the best technology ), designed to eliminate chatter , used allot on planning and shaping machines and for lathe form tools , it works by shifting the point at witch the tool bends , normal tools when put under cutting load will bend and dig into the work , bend a bit more and spring back ,, witch is what you see as chatter on the surface of the work ,, the swan neck tool is designed when under cutting load to deflect AWAY from the work ,,, no dig in = no chatter .
Were only talking about a very small deflection of the tool .

May be a drawing would make things clearer


Rob

[DaveH]

Rob,
A lot of holes there

Nicely done

But what is with the blue sissy glove then


DaveH

[DaveH]

Rob,

That quadrant was nicely done as well

DaveH

[RobWilson]

Thanks Dave

My hands were cold


Rob

[Wongster]

Beautiful! Simply beautiful.

[krv3000]

well dun rob is your center bar a home made to