large bore Myford spindle nose dimensions

[brickyParticipant @bricky]

[brickyParticipant @bricky]

I am making a chuck backplate for my S7 plus.I have mounted a large billet onto the faceplate and turned the chuck register.I am boring to size for the register and the thread which I will cut at this setting.Normally I take off the chuck and workpiece and try the thread onto the spindle nose,but I can't turn the faceplate around as it will not clear the bed.I have one shot at this and I don't want to start again.I need to know the dimensions over the thread and the depth of the thread .

Frank

[fivethou hammerParticipant @fivethouhammer12006]

Hi Bricky, I hope I can assist you.

Firstly, when my lathe came from Myford, there were two spare noses each mounted on a 2mt arbor. One was for the small bore lathe and the other was for the large bore which should give you the dimensions you need. Do you have these ?

Secondly, I am not sure I can assist with depth of thread, but can offer to measure any other dimension you would care to request…?

Regards

Gary

[brickyParticipant @bricky]

Thanks for replying Gary.

It is the depth of thread I am needing, as to disturb the set up and not be sure of engagement is what I am trying to avoid.I can't find a reference to the spindle nose dimensions and thanks again for trying to help.

Frank

[DMRParticipant @dmr]

The S7 Plus nose thread is documented as 42.5mm x 2mm pitch. So from tables you need the female thread depth of 0.54127 x pitch = 1.083mm. Hope that helps.

Dennis

[brickyParticipant @bricky]

Hi Dennis

Thank for that it is just what I need.I am now going to the workshop to set up my conversion set and get started.

Frank

[brickyParticipant @bricky]

Job done ,the help available on this forum is epic.

Frank

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