Myford Super 7 Quick Change Gearbox issue

Myford Super 7 Quick Change Gearbox issue

This topic has 4 replies, 3 voices, and was last updated 18 September 2023 at 10:31 by James Hellings.

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17 September 2023 at 16:57 #660400
James Hellings
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@jameshellings37740
I have a Myford Super 7 with a quick change gearbox. The problem is that the threads being cut are finer that expected, e.g. A1 should cut 8tpi but I'm getting roughly 10tpi, B5 should cut 22tpi but I'm getting about 26tpi.

I'm assuming that one of the gears in the train is wrong. Does anyone have to hand the standard gear sizes. What I have is as below:

Any help gratefully received.
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17 September 2023 at 16:57 #11570
James Hellings
Participant
@jameshellings37740
My Gearbox is cutting threads that are finer than expected
17 September 2023 at 17:16 #660402
Mike Crossfield
Participant
@mikecrossfield92481
20 tooth gear should be 24 tooth.
17 September 2023 at 17:41 #660403
Phil super7
Participant
@philsuper7
Also Remember the gear you have marked "57" can be turned around, usually only when screw cutting.

Your picture shows gearbox in fine feed mode, hope this helps.
18 September 2023 at 10:31 #660449
James Hellings
Participant
@jameshellings37740
Thank you very much indeed for your help, explains why I was 20% out!
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