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Spare 80t Gear for 9x20 Lathe

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Artie

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Oct 10, 2017
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#1
Does anyone know what mod the 920 lathe feed gears are? I have an Enco and would like a spare plastic 80t gear. I know Grizzly has a cast replacement gear but I would much prefer the quieter plastic gear. I see Little Machine Shop has a plastic mod 1.5 80t gear intended for the mini lathe that may work if bored from 12mm to 14mm and if the 920 gears are indeed 1.5 mod.
There is virtually no online information on this subject so any help would be much appreciated.
Thanks, Artie.
 

dgrev

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#2
Can someone please tell me what is the mod 1 and mod 1.5? It is meaningless to me.
 

Asm109

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#3
It is a number that relates to the size of the teeth. If you take the pitch diameter of the gear and divide by the number of teeth you get the module of the gear. The units are mm/tooth.
That is how the metric system describes tooth size.
The English system uses the reciprocal of this number. That is called the Diametral pitch or Dp for short. Units are Teeth/inch(of pitch diameter)
 

dgrev

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#5
Asm109. Thanks for the explanation. From what I can see, that still leaves shaft diameter, and thickness of gear to be stated?
 

dgrev

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#6
Radials - thanks for the link. He is only listing that one gear, pity, I need a 32T gear for a Taiwanese lathe.
 
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