Steel for crosslide screw

[sean logieParticipant @seanlogie69385]

What is best for this 4140 ,1018 ?

Sean

[sean logieParticipant @seanlogie69385]

[John ReeseParticipant @johnreese12848]

I would suggest 1144, Stressproof, or Fatigueproof. Good strength and machinability.

[Chris Evans 6Participant @chrisevans6]

First question is it worth it ? I bought a 1 metre length of 16 x4mm pitch left hand leadscrew very cheaply.

It was enough to make three cross slide screws, I also bought 2 bronze nuts to suit. All for just over £50. I now have a new screw and nut fitted a spare screw and nut ready to fit and enough screw to make another left over. Google lead screw lots of suppliers, I used Automotion Components. Not sure if they do imperial sizes but others do. If the spare 16×4 LH is any use to you let me know.

[sean logieParticipant @seanlogie69385]

Posted by Chris Evans 6 on 06/12/2016 13:33:01:

First question is it worth it ? I bought a 1 metre length of 16 x4mm pitch left hand leadscrew very cheaply.

It was enough to make three cross slide screws, I also bought 2 bronze nuts to suit. All for just over £50. I now have a new screw and nut fitted a spare screw and nut ready to fit and enough screw to make another left over. Google lead screw lots of suppliers, I used Automotion Components. Not sure if they do imperial sizes but others do. If the spare 16×4 LH is any use to you let me know

 

I have power cross feed the shaft that drives it is stepped so a straight piece of thread bar wont work . Very kind offer Chris  of the 16×4 all the same .

 

Sean

Edited By sean logie on 06/12/2016 17:33:15

[Clive FosterParticipant @clivefoster55965]

Turning the thread off an inch or two of acme threaded rod to make a spigot then cutting the old thread off the stepped part before drilling to match the spigot so the new thread can be fixed in works fine. I've done it 4 times now with no trouble on Boxford / Southbend size mchines. I silver soldered the thread in place but other folk report that high strength loctite works fine. Just need to be careful and accurate with the drilling. I always had another lathe available and/or worked on duplicate components which reduced the stress somewhat compared to operating on your one and only machine.

Clive.

[Chris Evans 6Participant @chrisevans6]

I to have powered cross feed on my 14"x40" lathe, It was a simple job to cut off the old worn threaded part, face and bore the remains of the existing piece and turn a spigot on the new screw. I used Loctite and a 3mm roll pin to secure the new piece. This was done around February when I made a complete new cross slide, very happy with it since.

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