Walker Magnetics TURBOMILL 40B - Manual (Page 16)

O.S. WALKER Co. Inc., Turbomill Electroperm Chucks
DD15508M.doc Rev. ~, September 17, 2002
4-5
4.6 Forces Generated by Milling
Turbo-mill milling chucks can generate up to 5 tons/ft² holding force, so it is very unlikely that
a work piece will lift away from the holding surface of the chuck. However, the resistance
force to horizontal sideways movement is approximately four to five times less than the
downward holding force. Consequently, if the cutting forces exceed the chuck’s resistance
force to horizontal sideways movement, the work piece will slide in the direction of the forces.
Therefore, when it is feasible, it is strongly recommended to use side and end stops. The
side and end stops will provide added support to resist the forces generated by the cutting
tool in conventional, climb, face, and edge milling applications. (See pages 4-5, 4-6, 4-7, 4-8,
4-9, 4-10, & 4-11)
4.6.1 Conventional Milling
The cutter tries to pull the work up and push it along the chuck. The machining force is F
tangential to the cutter its horizontal component FH is resisted by the end stop to the left,
and the friction between the work piece and chuck face. The vertical component FV is
resisted by the downward pull of the chuck.
Figure 4-3 Conventional Milling