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Tubal Cain's screwcutting reminder

A useful add-on for the Myford S7B

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ega23/01/2021 18:43:25
1999 forum posts
166 photos

Tubal Cain described this in Simple Workshop Devices (WPS28). His aim was to avoid the shock of engaging a fine feed on the Super 7 only to find that threads were actually selected in the train to the gearbox. Here is my version of his idea which also takes into account the possibility of a non-standard tumbler stud gear having been installed for, eg, cutting a metric thread with the English gearbox:


I mainly use 33 and 34 teeth alternative stud gears so I have three double-sided laminated cards hanging on the little brass stud in the photo, the third for the standard setup with 24 teeth whether set for threads or feeds.

Jon Lawes23/01/2021 18:53:18
470 forum posts

Good idea!

Steviegtr23/01/2021 19:41:16
1910 forum posts
252 photos

ega , a pic behind the cover would help me. Showing which gear to change & how. I bought these gears last year but someone said i would need to make another arm that holds them. So confused they went in a box & are still there.


ega23/01/2021 21:25:09
1999 forum posts
166 photos


For the use in mind, all you need is the extra tumbler stud gears, the point being that the expensive and time-consuming metric quadrant is not then needed. You might have to extend the arcuate slot in the standard quadrant slightly to accommodate the larger non-standard gears. The method has been covered extensively on the website complete with tables by other members showing the settings for the range of metric pitches available.

I posted this photo recently to show my arrangements for easing the installation process; you can see the non-standard 34T stud gear in position:


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