Ragland feed screw and nut

[Kim GarnettParticipant @kimgarnett94824]

Hi I been asked to make a feed screw and nut for little john lathe so I am looking for a drawing for Ragland little john feed screw and nut as I would like to make one as the original one is missing so I have no pattern to make it from

thanks in advance for any help

 

Kim

 

 

[Howard LewisParticipant @howardlewis46836]

Have used a Little John but never investigated feedscrews or nut.

Would guess that the thread will be left hand, probably 10 tpi (The dial divisions  will be a guide

100 divisions suggest 10 tpi, 125 suggest 8 tpi) Thread form likely to be square, but could be Acme.

The holes in the machine will give a guide as to diameter.

Which one is the one to be made?  Could you use another (Say Top Slide) as guide / pattern for the Cross Slide?

HTH

Howard

[peak4Participant @peak4]

From Tony’s site about the leadscrew, but I’m not sure if you mean the cross slide screw or the top slide one

Hard to tell from the photos, but it looks like it’s a RH thread

The half nuts might be a bit more tricky if they are completely missing

Bill

 

[Howard LewisParticipant @howardlewis46836]

Atre we talking Feedscrews (for Cross and/or Top Slide) or Leadscrew?

If Leadscrew then the diameter (3/4″) and thread pitch (8 tpi) is on Tony’s Lathes website, as posted above.

What will then need to be ascertained is Right or Left hand? and the thread form.

My guess would be Left Hand, possibly square.

Since the original post said “nut” that sounds like a Feedscrew.

A Leadscrew would need half nuts.

Howard

[Pete RimmerParticipant @peterimmer30576]

Finding out the hand of the screw is easy. If the feed handle travels with the slide, it’s RH, if the handle does not travel with the slide it’s LH.

I believe the scrw is square thread, I may have the specs somewhere but on a PC in storage so I’d have to go and fish it out.

[David SeniorParticipant @davidsenior29320]

I have a Little John Mk2 and a Raglan 5″ (and access to a Loughborough) so can probably get the info you need once I know specifically what you need. Which lathe? Which screw (cross slide, top slide, tailstock)? Imperial or metric?

I usually replace the square threads with ready-made acme and make the nut to suit, not being keen to cut new screws.

Dave

[Kim GarnettParticipant @kimgarnett94824]

Thanks for the replies the lathe in question is a little john not sure if mark 1 or 2 its the main cross slide which is left hand thread 1/2″ x 10 tpi not the top slide. The thread is a square thread which is no bother to cut for the screw or the nut but the information I need is the rest of the dimensions ie O/L length, diameters shoulder lengths gear fixing any keyway dimensions etc hope this helps

Kim

[David George 1Participant @davidgeorge1]

Most lathes of this syle should be square thread 10 TPI RH. I use silver steel for my lathe a M Type Myford lathe with same size thread. If it had a LH thread you would have to turn the handwheel in the wrong direction to every other lathe. For the nut I use phosphour bronze which I screw cut to size and then use a tap I made to just run through to check size.

 

David

[David SeniorParticipant @davidsenior29320]

A quick sketch of the cross slide screw and nut for a LJ Mk2

This is assembled from my notes from when I was replacing mine some years ago.

The distance from the centre of the thread to the mounting face for the nut needs to be checked on the job.

Hope you can read it and it is useful

Dave

[Mark EasingwoodParticipant @markeasingwood33578]

Hello,

A rough sketch of the nut on my MK11, taken a few years ago.

As said above the distance of the threaded hole to bottom of crosslide is the only important measurement required, the body of the nut just needs to be free in the channel. I haven’t measured the screw, but the length doesn’t matter much, as the channel in the carriage is open ended. 10 tpi. 0.5 in dia, sq thread Left Hand.

Some pictures,

 

My Lathe has the short crosslide, some lathes have a long crosslide.

I am in East Yorks, if you want to come and look for yourself, you are welcome.

Mark.

[Mark EasingwoodParticipant @markeasingwood33578]

A couple more pictures, they refused to load earlier!!

[Kim GarnettParticipant @kimgarnett94824]

Hi thanks for all of the replies that’s just the job brilliant

again thank you all

Kim

[Author]

Posts