hafco AL320-G GEARING

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jimhines

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hi im a new beginner and have made a small mistake and can't work out the gearing on my lathe.i worked out the manual for cutting metric threads and had good success but i did not take note of the default gearing for general work ,can anyone help the lathe is a hafco AL_320G
 

XD351

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If you look inside the door of the lathe where the gears are you will see a chart .
The gear train diagram will help yo identify what gear is what , the first two lines on the chart are for the gearing for turning .
The gear train is identified by letters - m, n, a, b, c, d. With m being the gear that feeds out of the lathe head and d feeds the lead screw .
I have mine set for 0.100 mm per turn of the spindle which is the finer of the two feeds available .
Gearing is as follows :
M = 24
N= 60
A= 24
B=50
C=25
D=48

Once you have that set up if you want the coarse feed ( 0.200mm per turn of the spindle ) you change M to 28 and N to35 and leave the rest as is .

I was told by the person i bought my AL320 off that one of the charts had an error for thread gearing but i can't remember if it was the one in the book or the chart on the lathe .

Hope that helps !

Ian.
 

rodw

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I don't believe there is any errors in the settings in the AL320g.

I have not gone out to my shed to check, but I'm pretty sure the default settings are listed at the top of the chart on the door.
 

XD351

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I haven't compared both of them yet but the last time i set it up for thread cutting i used the chart on the inside of the door lathe and it worked fine .
The chart can be a little confusing to a newcomer as the gear tooth count is set out as something that resembles a fraction multiplied by another fraction such as :
25 60
-- X --
50 24

In reality it is just two gear on the same shaft 25 & 50 that mesh with another two on the next shaft 60 & 24 .
 

rodw

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Also, there are a couple of drawings on the label one face on, and the other view from the edge of the cogs. I have found it useful to sketch the edge view on a sheet of paper and label the gears you need (ABCD and their ratios). That makes it much easier to change them.
 

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