Yost Vises 750-DI - Manual (Page 3)

If there is any question about a condition being safe or unsafe, do not operate the vise.
To avoid risk of personal injury, equipment damage, fire & shock, make sure work area
has the following conditions:
• Floor is dry. Damp, wet or rainy conditions can cause operator to slip.
• Operator must be of sufficient age to operate vise in a safe condition.
• Well Lit.
• Clean and unobstructed.
• Workbench is properly secured to floor or wall.
• Workbench is designed sufficiently to handle vise and work load (torque placed
upon the vise and workbench).
Mount Vise To A Secure Workbench
1. Place vise on the workbench to identify location of mounting holes. Most right
handed prefer a vise mounted on the left end of the bench, the opposite for a left
handed person.
2. For added strength to the workbench prior to installing and securing vise, place an
18” x 18” x 2” piece of wood (18” x 18” x ¼” metal plate) to the underneath side
of the workbench.
3. Mark and drill holes through the workbench and wood / metal plate using the
swivel base as the template for the mounting holes. Prior to drilling, make sure
area is free & clear of any hazards.
4. Install proper length & diameter bolts into the swivel base of the vise. At a
minimum use a hex bolt of sufficient diameter to fully encase the diameter of the
swivel base bolt hole. Yost recommends at hex bolt 2” longer than the bench top
thickness to accommodate for flat & locking washers as well as nuts. Use
minimum grade 5 bolts. On the underside of the workbench and wood / metal
plate, place a flat washer, lock washer and locking nut to the bolt. Securely
tighten vise to the workbench. Periodically, recheck and re-tighten the nuts.
5. As a possible suggestion mount the vise on the lower left hand corner of the work
bench that way the side of the vise and the handle end of the vise have maximum
work exposure (Rotation of the swivel base and the vise head). The swivel base
plate should be mounted (bolted) near the bottom edge of the work bench -- so
that there is sufficient bolt down capability. The head of the 750 should then be
able to rotate 360 degrees with respect to the horizon.
Vise Operation
Make sure vise selection (size and type) is appropriate for use and application. Larger
vises are readily available through Yost Vises. Never force or use cheater bars, pipe
extensions on the screw handle of the vise as this places excessive pressure on the vise
components and they may fail resulting in severe bodily injury.
Step 1: Make sure vise is securely mounted to the workbench.