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Smart and Brown 1.75 8 TPI back plate

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Nigel Turner 3	20/05/2020 11:24:45
1 forum posts	I have a Smart and Brown SAB and I have picked up a 6" 4 jaw chuck. I need a back plate with the spindle dimension 1.75 8 TPI. The internet is full of back plates for Myfords and Boxfords but they are the wrong thread or pitch. The inner recess is 127mm in diameter. Chronos sell one but it is already 127mm so there is no machining wriggle room. I would be happy with a cast iorn blank as long as its bigger than 127mm. Any help graetfully received
Martin Connelly	20/05/2020 22:22:42
2549 forum posts 235 photos	Have a look at this thread, it is relevant to your needs. Lathe threading tool A quick check on Ebay turned up this. Cast backplate blank It is easier to make your own backplate than it is to buy one. I and old mart have done this for our machines in the past and Jim Beagley is about to make one as well. Martin C Edited By Martin Connelly on 20/05/2020 22:25:57 Edited By Martin Connelly on 20/05/2020 22:28:00
old mart	21/05/2020 17:31:27
4655 forum posts 304 photos	The difference in price between a blank and a 6" Boxford threaded one from Chronos is not much and as long as the boss diameter is big enough on the Boxford one to make it 1.3/4 X 8, it would save a lot of messy machining. I have made a couple of Boxford threaded plates into Smart & Brown ones this way. If your 6" four jaw chuck has front mounting, you can probably use a smaller diameter backplate. It may even be possible to use one backplate for both a three jaw and a four jaw if you are lucky.

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