Myford Super 7 screw cutting gears (metric)

Bob (9fingers) - I have sent you a PM.

Rgds Simon

Just a public THANK YOU to simon for sending me an extremely professional 34 tooth changewheel.

What a Gent!

Thanks

Bob

Test

An old thread but I am still slightly confused as said on other threads. I am about to buy the 2 gears 33 & 34 tooth. Someone posted a picture but I was still not sure. Mine is a super 7B 1977. Does the new gear go below the 2 tufnol gears on the gear that you can remove one gear from it. A actual picture would be great if anyone has one.

Bump. I have ordered the 33 & 34 gears from Myford. I now think from reading posts that they fit on the shaft below the pair of tufnol gears. The shaft that holds 2 gears. So if correct do I turn that gear around for screwcutting so the 33 or 34 which I put on is to the inside, with larger gear to outside. Also anyone got an idea what year my QC gearbox is. No QC137956, my lathe is circa 1977.

Hello steviegtr, I've got Brian wood's excellent book and its all explained in the book, together with good clear photos. The shaft you are referring to has a pair of gears on it, which are keyed together. So you can change the outer gear, but you do have to lower the quadrant as the replacement is larger in diameter. In the book, it shows the shape and gives the dimension of the gear adapter which needs making. Brian also suggests making a little tool which makes adjusting the quadrant an easier task. Then you will need the tables of which there was a lot of discussion about in Model Engineer Workshop, when some errors were discovered, not pointing a finger anywhere,. Anyway, I think the book is worth buying. John Steviegtr

Thanks for that. I have copied the charts which were put on here some time ago showing which setting of the quick change for each pitch of metric thread. Not heard that I need a gear adaptor. What is that for.