Hoffman Mechatronics
Bridgeport Mill J1 Rebuild
6.2.1 Table X&Y-Axis Gib Removal
Removal of the Gib starts with the removal of the chip wiper covers and felt chip wipers. The
chip wiper covers are secured to the Saddle with small Flat Head Screws as shown in Figure 39.
The aluminum chip wiper cover seen here actually holds two small felt chip wipers in place that
wipe the way surface as the axis is moved. The rear chip wiper cover may be removed by raising
the knee until the dovetails for the knee clear the dovetails on the base pedestal. At this point the
chip wiper cover may be slid backwards towards the base pedestal and off the unit. Once you
have removed the chip wiper cover you will see the Gib Adjusting Screws.
Chip Wiper
Retaining Screws
Figure 39 - Y-Axis Chip Wiper Cover
The Gib Adjusting Screw for the X-Axis is located in the forward left portion of the Saddle. The
Gib Adjusting Screw for the Y-Axis is located to the left side of the saddle. Turning the Gib
Adjusting Screws counterclockwise will start to extract the Gibs. If the Gibs are stuck, I have
found that they will come out easier if you slide the Table/Saddle away from the Gib Screw
while turning the screw counterclockwise.
Gib Adjusting
Screw
Gib
Figure 40 - Y-Axis Gib and Adjusting Screw
6.2.2 Table X&Y-Axis Gib Inspection
The Gib should be inspected for scratches, rust, metal shavings, rough edges, etc. The Gib tends
to wear on the outer ends, so be sure to check the Gib for flatness. If your Gib has a lubricating
hole, you should also check this to make sure that it is clear and unobstructed.
BPJ1RBLD_002
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January 31, 201111
