{"id":5,"date":"2021-03-07T17:53:00","date_gmt":"2021-03-07T17:53:00","guid":{"rendered":""},"modified":"2023-01-18T11:25:50","modified_gmt":"2023-01-18T11:25:50","slug":"2mt-lathe-chuck-adapter","status":"publish","type":"post","link":"https:\/\/blog.hslracing.com\/workshop\/2021\/03\/2mt-lathe-chuck-adapter.html","title":{"rendered":"2MT Lathe Chuck Adapter"},"content":{"rendered":"

Back in July of 2014 I bought a Boxford morse taper 2 chuck adapter.<\/p>\n

\"\"<\/a><\/div>\n
The Boxford lathe uses a 1 1\/2″ 8TPI BSF thread, whereas my Mellor uses 1 1\/4″ 9TPI BSF, the crests of which are smaller than the valleys of the Boxford thread.<\/div>\n

The first step was to machine off the existing threads and the register down to 1 1\/4″.<\/p>\n

In order to cut the threads, I inserted a 3MT to 2MT adapter in the spindle nose and then inserted the chuck adapter and supported the nose with a rotating centre, this also helped prevent the adapter from slipping as it does not have a full length taper.<\/p>\n

Next I needed a gear train suitable for threading at 9TPI, which on my lathe is a 40 tooth drive gear, a 90 tooth final gear and anything as an intermediary, I chose to use a second 40 tooth gear.<\/p>\n

\"\"<\/a><\/div>\n

I used a 55 degree carbide insert threading tool and ran the lathe forwards and backwards in back gear at the slowest speed to give me a chance of stopping the tool before it hit the collar.<\/p>\n

\"\"<\/a><\/div>\n

When I believed I was close to the final size I moved the tailstock centre and tested the thread with a face plate.<\/p>\n

Here is the chuck adapter at final size with the face plate mounted.<\/p>\n

\"\"<\/a><\/div>\n

The shoulder of the chuck adapter is a close as this lathe gets to an actual register.<\/p>\n

The finished item.<\/p>\n

\"\"<\/a><\/div>\n

I need to see where I have put the piece that attaches to the rear of the chuck adapter for securing it in a rotary table.<\/p>\n","protected":false},"excerpt":{"rendered":"

Back in July of 2014 I bought a Boxford morse taper 2 chuck adapter. The Boxford lathe uses a 1 1\/2″ 8TPI BSF thread, whereas my Mellor uses 1 1\/4″ 9TPI BSF, the crests of which are smaller than the valleys of the Boxford thread. The first step was to machine off the existing threads…<\/p>\n","protected":false},"author":1,"featured_media":59,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[5,14],"class_list":["post-5","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorised","tag-lathe","tag-metalwork"],"_links":{"self":[{"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/posts\/5","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/comments?post=5"}],"version-history":[{"count":5,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/posts\/5\/revisions"}],"predecessor-version":[{"id":338,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/posts\/5\/revisions\/338"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/media\/59"}],"wp:attachment":[{"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/media?parent=5"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/categories?post=5"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hslracing.com\/workshop\/wp-json\/wp\/v2\/tags?post=5"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}