Feed Gears
In order to obtain feeds much slower than shown on the chart, use these gear combinations:
At position
A of the gear
train, use the 28t gear
At position
C of the gear train, stack the
30t gear on
the outside and the 127t gear on the inside
At position
B use the
120t gear lined up with the
30t
gear of the banjo
Note: Shown below is a Jet BD-920N on its
stand which raises the lathe high enough for the big gear to clear mounting surfaces.
A lathe mounted directly onto a flat surface would require spacers.
This gear chart is for a Jet BD-920N lathe.
These gear combinations allow very slow feed
rates.
The nine quick-change gears provide a useful range of different speeds.
Reduce belt idler tension & belt breakage by
installing an S-link.
The lowest cost for the cog belt off the motor,
170XL050 NG, is from Polybelt on
eBay.
Drive timing belts are identified by three parameters and marked as follows:
170 XL 050 NG
The first number is the belt length (17"), the belt has 85 teeth.
The second is the pitch (XL=1/5"), the peak to peak
tooth spacing
The third is the belt width (050= 1/2")
Belt/gear guard housing notch cut to allow the big gear to clear when
the cover is closed.
Gear protruding through the notch. Making a
safety guard.