Harrison 11 gearbox

[Alan Ward 4Participant @alanward4]

Is there a chart available to cut imperial threads from a metric gearbox on a Harrison 11".

[Alan Ward 4Participant @alanward4]

[norm nortonParticipant @normnorton75434]

Alan

Yes there is, try https://groups.io/g/HarrisonLathe. You will need a set of change gears.

Also, Google is a wonderful finder of stuff. Type this "harrison metric gearbox imperial thread" into your browser and all the previous discussions on this forum, and others, will come up.

Norm

[Alan Ward 4Participant @alanward4]

Thanks.

Yes I have all the change wheels – it was just the chart I needed.

[norm nortonParticipant @normnorton75434]

Do you have a Harrison 140? [140mm – 5.51"]    The 11" was renamed when the metric gearbox was fitted, along with metric dials and a 6mm pitch leadscrew. A metric gearbox will have three thumb levers rather than the two of the earlier imperial lathes.

 

 

Edited By norm norton on 08/09/2021 15:53:42

[Alan Ward 4Participant @alanward4]

No – mine is an 11". It is metric though; 3 levers and metric handwheels, and of course, metric leadscrew.

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