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Smart and Brown Lathe Crosslide Screw Renewal

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Darren:
The next part to this saga is one I have been agonising over for months. I just didn't have a piece of leaded bronze big enough.... :bang:

For months I have been watching Ebay for a piece, but nothing has come up. New prices, well you just don't want to know....
I needed a 2" round and when they get to that size it just gets silly for making a simple nut.....!!


I have spent 6hrs today polishing my new concrete garage floor that was laid yesterday. That's on your hands and knees floating 24hr old cement. Floating, wetting, floating, wetting and polishing in an effort to get a smooth floor ready for painting when it has fully dried.

Anyway, some sanctuary in the workshop was called for, alone where it's quiet  :lol:

Then it struck me, I already had the material for this nut, I was just looking at it the wrong way.

I bet I've lost you all by now so better show a pic of what I'm on about.... :ddb:

This is what I want to make from this bar, but the dia is too small



But if we look at it this way on....



On the miller to machine a flat, I need somewhere to calculate from, a datum if you like



Turned it over to machine the other side flat, carefull not to take too much off



Center punched the position for the threaded spigot, and set up off center on the lathe in the four jaw chuck



Don't brass chippings just love to fly everywhere at great speed. Here's my patented brass chipping barrier  :lol: An old shop leaflet display re-shaped and help down with a microwave magnet.... :dremel:



Spigot now turned



Threaded with a trapezoidal tap, 10mmx2 pitch



Trimmed to length, note a tiny pip of the original bar curvature, couldn't be helped as there had to be compromises due to material size



Out of the four jaw, turned around and into a collet



I forgot to take the next pic, sorry, I simply rounded off the backplate a bit to size

Back on the miller in a collet fixture to machine two flats



And voila.....!!
The flat on the bottom is of no consequence, another compromise, but not an issue.





All that's now needed is two curved slots.....gulp.... ::)

That means the rotary table that I've yet to figure out how it works and how to mount this piece. I'm thinking MT2 blank end drilled and tapped to hold this nut?

bogstandard:
Wonderful stuff Darren.

You are starting to look at pieces of metal how they should be looked at in our game. Forget what shape the original metal is, imagine the piece you want being in there. Then using your ingenuity to make it come out.

Now you have to take the plunge Darren, and get the RT set up. This just might be the push you need to get you working in another dimension. A rather different and sometimes difficult learning curve, but once you get the hang of it, you will wonder how you ever made things without it.

John

Darren:
Thanks John,

I was quite pleased with myself today. Firstly I was just sitting there having a coffee and a smoke, as you do in your own little space, when it struck me.
Secondly cos it worked out quite well.

Next moment I get I'll set up the RT and have another "ponder" on how to proceed...

Divided he ad:
Top job  :thumbup:

It'll certainly do it's intended job   :beer:



I think your RT set up idea sounds about right..... As I see it all you need is a slot drill of the right size (usually 2 flute) to make it a little easier!




You'll figure it out no worries Darren  :smart:





Ralph.

sbwhart:
Nice Job Darren well done  :clap: :clap: :clap: :clap:

You'll have no problems with the RT, the M2 tapered mandrel is the way to go, I've used a similar technique myselve a number of times.
 
:nrocks:

Have fun

Stew

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