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Thread: Hercus Model A 9" gear set
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15th Feb 2021, 11:50 AM #1New Member
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- Jan 2012
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- Victoria
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Hercus Model A 9" gear set
My apologies if already covered but I can't find what I need.
I have a Hercus Model A 9" with a quick change box.
Most of the change gears are missing.
Can anyone tell me how many gears are in a standards set and what the tooth counts are please.
A photo of a standard set up on the lathe would be most appreciated.
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15th Feb 2021, 12:04 PM #2Senior Member
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- Aug 2015
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- Adelaide
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On the standard set up there is a 20 or 40 tooth gear (depending on which feed/screw cutting rate you are using from the gearbox plate) for the gear that drives from the reversing tumbler with then drives an 80 tooth idler gear to a 56 tooth gear on the gearbox.
You should have a 40 tooth gear on the gearbox which interchanges with the 20 tooth gear.
The attached pic may help understand what i am talking about.
If you were talking about the gears for cutting metric threads then there is a totally different set of gears for that.
Regards Steve
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15th Feb 2021, 02:08 PM #3Senior Member
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- Aug 2015
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- Adelaide
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This might be a better description for you with these pics.
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27th Feb 2021, 06:21 PM #4Intermediate Member
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- May 2004
- Location
- Melbourne Australia
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