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Here's my take https://www.whitworthsociety.org/history.php?page=2 JW grew up through the early 1800s through the shop floors of Machinery Makers of the time and noted how there was no standard way of making nuts and bolts etc. So he set about amassing a collection from many of the factors around the Midlands area. He then deduced an average for Pitch (tpi) preferences and settled on an average angle of 55deg without further thought. He arrived at the form recognising that sharp points were impractical and made bolts weak So armed with a compass and a set square here is what occurred

Model Engineer Do you want to contact the Model Engineer and Model Engineers' Workshop team? You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues. Click THIS LINK for full contact details. For subscription issues please see THIS LINK. Digital Back Issues

http://www.rotagriponline.com/datasheets/Pratt/PrattChuckSpares.pdf Briefly, there was EB, EC and ED. EC is by far the most common and the other sizes are unlikely on D1-3. Please also read the information here: https://www.mig-welding.co.uk/forum/threads/today-i-acquired.50192/page-1490 concerning the closing ring of early models needing modification to accept 'E'-series collets. Please login to post a reply. '); AdButler.ads.push({ handler: function(opt) { AdButler.register(154425, 176021, [300, 250], 'placement_176021_' + opt.place, opt); }, opt: { place: plc176021++, keywords: abkw, d...

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Do you want to contact the Model Engineer and Model Engineers' Workshop team? You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues. Click THIS LINK for full contact details. For subscription issues please see THIS LINK. Digital Back Issues