100 tooth change gear for a SB9

[Jim F]

I have looked and cannot find a 100 tooth change gear.
The transposing gears on flea bay are not what SB calls for in their book.

 

[Ulma Doctor]

if you don't mind 3d printed gears,
i can print you the set of metric transposing gears( or just the 100 tooth)

Hercus 9A lathe 100/127 transposing gear set for metric threading by Schtimpy

For cutting metric threads on an Imperial lathe with 8TPI leadscrew. This set of transposing gears is designed for a Hercus 9A imperial (inch/english) lathe (9" model A lathe with quick change gearbox and 8 TPI leadscrew) and is used to cut metric threads. The Hercus is a South Bend clone, and...

www.thingiverse.com

 

[DavidR8]

How long something like that would take to print?


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[Ulma Doctor]

How long something like that would take to print?


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checking right now......

 

[Ulma Doctor]

the 100/127 is a stacked gearset, it takes around 11hrs to print

the other smaller single gears print in about 2 hours each

 

[DavidR8]

the 100/127 is a stacked gearset, it takes around 11hrs to print

the other smaller single gears print in about 2 hours each

Ok that’s a long time!


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[Ulma Doctor]

Ok that’s a long time!


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yeah there is a lot of plastic being laid down at around 80mm/s

 

[martik777]

Which metric threads do you need? Many can be cut with a simple stud gear change. ie: a 19t stud on a 9A will cut 1 and 1.5mm with .5% accuracy

 

[Jim F]

Which metric threads do you need? Many can be cut with a simple stud gear change. ie: a 19t stud on a 9A will cut 1 and 1.5mm with .5% accuracy

I am cutting 1.0
I do not have the luxury of a QCGB, I have a C model.

 

[benmychree]

I can cut those numbers of teeth in metal.