Super 7 Lead screw length

Advert

New Replies

Report Bug

Help/FAQs

Super 7 Lead screw length

This topic has 6 replies, 5 voices, and was last updated 27 July 2015 at 15:38 by Lambton.

Viewing 7 posts - 1 through 7 (of 7 total)

Author

Posts
27 July 2015 at 10:05 #12515
Glyn Davies
Participant
@glyndavies49417
Advert

27 July 2015 at 10:05 #198082
Glyn Davies
Participant
@glyndavies49417
Hi. I'm removing the gearbox from my 1967 long bed Super 7 lathe and returning it to the change wheel system. I need to lengthen the leadscrew. Can anyone please tell me the length of a non gearbox long bed Super 7 leadscrew?

Any suggestions as to how I might lengthen it would also be welcome!
27 July 2015 at 10:29 #198090
Brian Wood
Participant
@brianwood45127
Hello Otley,

I can't answer your questions but I do have an alternative suggestion.

If you have the Metric quadrant, why not simply use that for the change wheels and leave the gearbox set at 8 tpi?

You will avoid the complications of attaching an extra length to the current leadscrew, figuring out where to put the Woodruff key dimple on the end for change wheel drive and make+fit securely the joining sleeve to extend the l/screw.

It also preserves the gearbox for another user in the future. I don't really see why you would want to return to change wheels by the route you are considering.

Regards

Brian
27 July 2015 at 11:54 #198097
David Clark 13
Participant
@davidclark13
It should be the same length from the tail stock end to the headstock end to the end of the lead screw. It might be useful to add the dog clutch as used on the ML10.
27 July 2015 at 12:02 #198098
KWIL
Participant
@kwil
What is the reason for removing the gearbox? Surely a retrograde step?
27 July 2015 at 13:30 #198107
Glyn Davies
Participant
@glyndavies49417
Many thanks for troubling to reply. The reason for my question is that I have just bought a long bed PCF machine that didn't have a gearbox, so I have fitted the gearbox from my earlier lathe to it. I stupidly forgot to measure the length of the PCF leadscrew before I cut it – I was so anxious about putting a long bed PCF leadscrew in the band saw lest I cut it in the wrong place!

The idea is to make my old lathe sellable as a non gearbox model with a set of change gears.

I now have two two-tone grey-green long bed Super 7s. I was going to paint the grey bits of the new one green and the green bits of the old one grey, but I think the two tones look quite nice..
27 July 2015 at 15:38 #198118
Lambton
Participant
@lambton
If you measure the length of the piece you cut off the long bed lead screw and add it to the existing cut-down standard bed lead screw + the width of the cut off saw blade this will give you quite an accurate way of getting the normal length of the short bed lead screw.

The length of the non gear box lead screw is not as critical as that for the gear box versions there is nothing to foul it at the left hand end.
Author

Posts