what lathe did these come from

[Frances IoMParticipant @francesiom58905]

found at local men in shed could be useful bin

2x 20 22,24,26,28 30,34,36,38 40 + 50 2x 100, 127

[mgnbukParticipant @mgnbuk]

Sherline

Parts shown in the picture is incomplete –  missing the spindle handwheel that was part of the screwcutting kit. Screwcutting ing on a Sherline was only done by hand turning the spindle, not under power.

Nigel B.

[Nigel Graham 2Participant @nigelgraham2]

If those were all change-wheels the four at top left are clearly from a different source as the others.

That’s a rum combination on that banjo, too, with one much coarser than the other. Their largest is of that magic 127, inch-metric conversion; but all these wheels seem to have been for a small lathe indeed, likely under 3″ centre-height.

The banjo looks user-made, perhaps to add a further stage to a lathe whose standard trim allowed only a two-stage compounding.

Perhaps they were all used on one lathe whose owner managed to create an extra stage using the finer-pitch gears to give an extra fine-pitch and metric-pitch ability on a physically small headstock. Though he’d have had to solve the problem of the different keyways: a special, dual-profile key perhaps.

The source might not be a lathes or lathes, either.  The alternative machines could have been dividing-heads or coil-winders, for example.

They’d be more identifiable if you could quote the bores and DPs (or modules if they are of metric dimensions).

[mgnbukParticipant @mgnbuk]

The four to the upper left are from a different set to the others, and that’s a rum combination on that banjo, with one much coarser than the other. Their largest is of that magic 127, inch-metric conversion;

That is how Sherline made them, Nigel. The Sherline instruction leaflet for the screwcuttintg kit is available online as a .pdf (as are all Sherline instruction leaftlets) which explains all. The banjo arrangement is “proper” Sherline.

Nigel B.

[BazyleParticipant @bazyle]

They are the only lathe manufacturer that has the sense to realise that the whole set doesn’t have to be the same DP so avoiding a huge 127. It does occasionally get suggested on here but why the OEMs never think of it is a sad reflection on their designers.

[Lee RogersParticipant @leerogers95060]

I use a compound change wheel set up on my Admiralty Drummond for fine feed. The different DP of the first two wheels allows a smaller 16t on the spindle instead of the Drummond 20t. Crossfeed through the rack for parting off is a breeze because the cutting load is constant.

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