Workholding
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Frequently asked questions
Which specifications matter when choosing a machine vise?
The key figures are jaw width, maximum opening, clamping force, and jaw parallelism and squareness. CNC vises usually have anti-lift mechanisms and tighter setup accuracy than drill press vises.
When are soft jaws used?
Aluminum or mild steel soft jaws are machined to the part profile to hold irregular or finished surfaces without marking. They should be machined in place on the vise itself to ensure alignment.
How do I size a T-slot clamping kit?
The stud and T-nut must match the table's T-slots per DIN 650, for example 14, 18 or 22 mm slots. When clamping, place the stud closer to the workpiece than to the support block and keep the strap level or tipped slightly toward the part so force goes into the work.
How do 3-jaw and 4-jaw chucks differ?
Three-jaw chucks self-center and are quick for round and hex stock, but concentricity is limited by wear. Four-jaw independent chucks adjust each jaw separately, holding square or offset work and allowing dial-in to a few microns.
How much clamping force should a vise apply?
Clamping force must hold the work against cutting forces without distorting thin-walled parts. Hydraulic vises or vises with a force multiplier allow repeatable force between clampings. Thin parts should be clamped lightly with reduced depth of cut rather than tightened hard.
How do I align a vise to the machine axis?
Mount a dial indicator on the spindle, touch the fixed jaw and traverse the table along the jaw, tapping the vise until the error is within limits, then tighten the hold-down bolts. Vises with keys that locate in the T-slots make remounting faster. Recheck after tightening, since the vise can shift.
What is the benefit of zero-point clamping systems?
Zero-point systems locate and clamp fixtures or pallets on the table with reference pins, allowing fixture changes in minutes with high repeatability. Work can then be set up off the machine while it keeps running. These systems suit production of many part numbers in small batches.
Do lathe chucks need periodic checks?
Yes, jaw guideways packed with chips and lacking grease lose a significant amount of clamping force, so clean and apply dedicated chuck grease on the maker's schedule. Measuring grip force with a chuck force gauge reveals loss before a part is thrown. Worn jaws reduce concentricity and should be replaced or bored.
