Views: 0 Author: Nancy Liu Publish Time: 2026-08-17 Origin: Zhenghao Machinery
Table of Contents
Running a single vise on a CNC machining centre is straightforward. The vise goes on the table, you probe the jaw face and the vise bed, set your work offset, and run the program. The entire setup takes ten to fifteen minutes.
Running three, four, or six vises on the same table is a different problem entirely — and one that many shops approach inefficiently, spending forty-five minutes or more on a setup that should take fifteen. The inefficiency usually comes from one of three sources: misaligned vises that require individual angular correction, non-co-planar vise beds that require individual Z-offset compensation, or a work offset strategy that requires probing every vise independently.
All three inefficiencies are solvable. The solution depends partly on technique — the alignment and referencing procedures described in this guide — and partly on the vise itself. The GT Series Precision Modular Vise is specifically engineered to support efficient multi-vise setups: all-six-face precision grinding to 0.005 mm ensures co-planarity and co-squareness across a bank of vises, and the modular body design allows consistent T-slot referencing without individual alignment adjustment.
This guide covers the complete multi-vise setup procedure from table preparation through work offset programming, with specific reference to GT Series specifications and the techniques that exploit them.
When you place two vises on a machine table side by side, three independent errors can exist between them:
Error 1 — Angular misalignment (yaw)
The fixed jaw faces of the two vises are not parallel to the machine's X-axis. Each vise is rotated by a small angle relative to the machine coordinate system. If Vise 1 is aligned to X and Vise 2 has a 0.02° yaw error, a 100 mm long workpiece in Vise 2 will have a positional error of:
at the far end — seven times the GT Series' rated accuracy.
Error 2 — Height variation (Z-offset between vises)
The vise beds of the two vises are at different heights. If Vise 1's bed is at Z = 0 and Vise 2's bed is at Z = +0.03 mm, a program written with a single Z-reference will machine the workpiece in Vise 2 at the wrong depth — either leaving excess material or cutting too deep.
Error 3 — X/Y positional offset
The fixed jaw faces of the two vises are not at the same X-position (for vises arranged along the Y-axis) or the same Y-position (for vises arranged along the X-axis). This offset must be known precisely to calculate the correct work offset for each vise.
On a conventional vise, all three errors require individual measurement and correction for each vise in the bank. On a GT Series vise bank, Errors 1 and 2 are largely eliminated by the vise's construction — and Error 3 is reduced to a simple arithmetic calculation.
The GT Series vise body is precision-ground on all six faces to 0.005 mm parallelism and squareness. This means:
All GT Series vises of the same model have the same body height within 0.005 mm — eliminating inter-vise Z-offset as a significant error source
All GT Series vise bodies have square side faces to 0.005 mm — allowing the vise body to be referenced directly against the T-slot or a precision parallel, without individual angular adjustment
All GT Series vise bodies have parallel fixed jaw faces to 0.005 mm relative to the body reference surfaces — so a vise body that is square to the machine axis has a fixed jaw face that is also square to the machine axis
The practical consequence: a bank of GT Series vises installed against the same T-slot reference, on a clean machine table, will be co-planar in Z within 0.005–0.01 mm and co-square in the XY plane within 0.005–0.01 mm — without any individual shimming, indicating, or angular adjustment.
This is the foundation of the efficient multi-vise setup procedure described below.
Before mounting any vises, the machine table must be prepared correctly. Errors introduced at this stage propagate through every subsequent step and cannot be corrected by the referencing procedure.
Chips, coolant residue, and swarf in the T-slots prevent the vise mounting bolts from seating correctly and can introduce angular errors by preventing the vise body from sitting flush against the T-slot reference face.
Procedure:
Use a T-slot cleaning tool or a brass brush to remove all debris from the T-slots that will be used for vise mounting
Wipe the T-slot faces with a solvent-dampened cloth
Dry wipe to remove solvent residue
Inspect the T-slot faces for burrs or raised edges — any burr that contacts the vise mounting foot will tilt the vise. Remove burrs with a fine flat file or a deburring tool
The machine table surface — the flat area between and around the T-slots — must be clean and free of chips, coolant residue, and raised burrs before the vises are mounted.
Procedure:
Air blow the table surface
Wipe with a solvent-dampened cloth
Run a precision straight edge or a flat reference block across the mounting area and check for high spots with a feeler gauge. Any high spot greater than 0.005 mm should be investigated — it may be a chip, a burr, or a surface defect that will tilt the vise
For applications requiring the full 0.005 mm GT Series accuracy across a multi-vise bank, verify the flatness of the machine table in the mounting area before installing the vises.
Procedure:
Mount a dial test indicator (DTI) in the machine spindle
Move the spindle to touch the table surface at one end of the mounting area
Zero the DTI
Move the spindle along the full length of the mounting area and record the maximum variation
Acceptance criterion: Variation ≤ 0.005 mm for precision applications; ≤ 0.01 mm for standard production applications
If the table flatness exceeds the acceptance criterion, investigate the cause before proceeding. Common causes include: chips embedded in the table surface, a worn or damaged table area, or thermal distortion from a recent heavy machining operation.
The most efficient alignment method for GT Series vises exploits the all-six-face grinding standard. Because the GT Series vise body side faces are ground square to 0.005 mm, the vise can be aligned to the machine's X-axis by referencing the vise body side face against the T-slot — without using a dial indicator on the jaw face.
This is the key difference from conventional vise alignment. On a conventional vise, the body side faces are not precision references — only the jaw face is. Aligning a conventional vise requires indicating the jaw face directly, which takes 5–10 minutes per vise. On a GT Series vise, the body side face is a precision reference equivalent to the jaw face, allowing alignment by contact rather than by indicating.
T-slot referencing procedure for a single GT Series vise:
Place the vise on the machine table with the mounting bolts loosely engaged in the T-slots
Slide the vise body side face firmly against the T-slot reference face (the machined face of the T-slot that runs parallel to the machine's X-axis)
Apply light hand pressure to keep the vise body side face in contact with the T-slot reference face
Tighten the mounting bolts to the specified torque while maintaining contact pressure
Verify alignment with a DTI on the fixed jaw face — for a correctly installed GT Series vise, the DTI reading across the full jaw face length should be within 0.005–0.01 mm without any adjustment
For a bank of multiple GT Series vises:
Repeat the same procedure for each vise. Because all GT Series vise bodies are ground to the same squareness standard, each vise referenced against the same T-slot face will be aligned to the same angular reference — without individual adjustment between vises.
Note on T-slot reference quality: The T-slot referencing method is only as accurate as the T-slot itself. On a well-maintained machine tool, the T-slot reference face is parallel to the machine's X-axis within 0.005–0.01 mm per 300 mm. If the T-slot reference face is worn or damaged, use the dial indicator method described below instead.
When the T-slot reference quality is uncertain, or when the application requires angular alignment better than 0.005 mm, use the dial indicator method:
Procedure:
Mount a DTI in the machine spindle with the tip contacting the fixed jaw face of the first vise
Move the spindle along the X-axis (parallel to the jaw face) and record the DTI reading at each end of the jaw face
Adjust the vise angle until the DTI reading is consistent across the full jaw face length — within 0.003 mm for precision applications, within 0.005 mm for standard production
Tighten the mounting bolts
Re-verify after tightening — bolt tightening can introduce small angular shifts. If the reading changes by more than 0.002 mm after tightening, loosen, re-adjust, and re-tighten
For subsequent vises in the bank, use the first vise's fixed jaw face as the angular reference — the DTI reading on each subsequent vise should match the reading on the first vise within 0.005 mm.
The spacing between vises in a bank determines the X or Y distance between the work origins of adjacent vises. This distance must be known precisely to calculate the correct work offset for each vise.
For GT Series vises, the spacing can be calculated rather than measured, because the vise body dimensions are consistent to 0.005 mm across the production batch. The distance between the fixed jaw faces of two adjacent GT Series vises is:
where
is the centre-to-centre distance between vise bodies,
is the vise body width, and
is the jaw width.
In practice, the simplest approach is to measure the X or Y distance between the fixed jaw faces of adjacent vises directly — once, after installation — and record this distance as the vise pitch. For subsequent setups using the same vise bank configuration, this pitch value is used directly in the work offset calculation without re-measurement.
In a multi-vise setup, all vise beds must be at the same Z-height for a single Z-reference to apply to all vises. If the vise beds are at different heights, a program written with a single Z-reference will machine workpieces in different vises at different depths.
For a GT Series vise bank, the all-six-face grinding standard ensures that all vise bodies of the same model have the same height within 0.005 mm. In most production applications, this inherent co-planarity is sufficient — no individual Z-shimming is required.
For applications requiring better than 0.005 mm Z-height consistency, verify co-planarity after installation:
Procedure:
Mount a DTI in the machine spindle with the tip contacting the vise bed of the first vise
Zero the DTI
Move the spindle to contact the vise bed of each subsequent vise and record the DTI reading
Acceptance criterion: All readings within ±0.005 mm of zero for precision applications
If any vise bed is outside the acceptance criterion, investigate before shimming:
Is the machine table surface clean and flat at that vise's mounting location?
Is the vise mounting foot clean and free of chips?
Are the mounting bolts tightened evenly?
In most cases, a Z-height discrepancy greater than 0.005 mm on a GT Series vise bank indicates a table surface or mounting condition issue rather than a vise body height variation.
This is where most shops lose the most time. The conventional approach — probe each vise independently, set a separate work offset for each vise — is correct but slow. For a six-vise bank, independent probing takes 30–45 minutes. There is a faster approach that exploits the GT Series' dimensional consistency.
This strategy probes one vise — the reference vise — and calculates the work offsets for all other vises from the known vise pitch and the GT Series' dimensional consistency.
Concept:
Probe Vise 1 (the reference vise) fully: X origin, Y origin, Z origin
Set G54 (or your first work offset register) from the Vise 1 probe results
Calculate G55, G56, G57... by adding the known vise pitch to the X or Y component of G54
Procedure:
Step 1 — Probe the reference vise (Vise 1)
Using your machine's probing cycle (or a manual DTI procedure):
Probe the fixed jaw face of Vise 1 to establish the Y-axis origin (the jaw face position in Y)
Probe the left end face of Vise 1 (or a known reference feature) to establish the X-axis origin
Probe the vise bed of Vise 1 to establish the Z-axis origin
Set these three values as the G54 work offset
Step 2 — Measure the vise pitch
Measure the X-axis distance (for vises arranged along X) or Y-axis distance (for vises arranged along Y) between the fixed jaw faces of adjacent vises. This is the vise pitch
.
For a GT Series vise bank where all vises are the same model and are mounted with consistent spacing, this pitch is constant across the entire bank. Measure it once between Vise 1 and Vise 2 — the same pitch applies between all adjacent pairs.
Step 3 — Calculate and set remaining work offsets
For vises arranged along the X-axis with pitch
:
The Y and Z components of G55, G56, G57... are identical to G54 — because all GT Series vises in the bank have the same jaw face Y-position (same angular alignment) and the same vise bed Z-height (same body height).
Step 4 — Verify with a single probe touch per vise
After calculating and entering the work offsets, verify each offset with a single probe touch on the fixed jaw face of each vise:
Move to the calculated G55 X-origin position and touch the fixed jaw face of Vise 2
The probe reading should be within ±0.005 mm of the G54 jaw face reading
If the reading is outside ±0.005 mm, update G55 with the measured value and investigate the cause of the discrepancy
This verification step takes approximately 30 seconds per vise — compared to 5–8 minutes for a full independent probe cycle. For a six-vise bank, the total setup time is reduced from 30–45 minutes to approximately 8–12 minutes.
When the vise bank contains different vise models, different jaw widths, or non-uniform spacing, the single-reference calculated offset strategy cannot be applied directly. Use independent probing for each vise:
Probe each vise fully (X, Y, Z origins) using the machine's probing cycle
Set each vise's work offset independently
Record the measured offsets for future setups — if the vise bank configuration does not change between jobs, the recorded offsets can be re-entered directly without re-probing
For shops that run the same multi-vise configuration repeatedly — the same vises, in the same positions, for the same family of parts — a fixture offset table eliminates setup probing entirely after the initial qualification:
Perform a full independent probe of all vises in the initial setup
Record all work offset values in a fixture offset table (a spreadsheet or a CNC program comment block)
For all subsequent setups with the same configuration, enter the recorded offset values directly — no probing required
Verify with a single probe touch per vise before the first production run
The GT Series' 0.003–0.005 mm repeatability means that a vise returned to the same T-slot position (same mounting bolts, same torque) will return to within 0.005 mm of its previously recorded position. For most production applications, the fixture offset table values are valid without re-probing — the single verification touch confirms this before each run.
A multi-vise CNC program calls each work offset in sequence, executing the machining cycle for each vise before moving to the next. The basic structure for a four-vise program:
G54 (Select Vise 1 work offset)
M98 P1000 (Call machining subprogram)
G55 (Select Vise 2 work offset)
M98 P1000 (Call machining subprogram)
G56 (Select Vise 3 work offset)
M98 P1000 (Call machining subprogram)
G57 (Select Vise 4 work offset)
M98 P1000 (Call machining subprogram)
M30 (Program end)The machining subprogram (O1000) contains the complete toolpath for one workpiece, written relative to the work origin (X0, Y0, Z0). By calling the same subprogram with different work offsets, the same toolpath is executed at each vise position without duplicating the toolpath code.
When the spindle moves from one vise to the next, it must clear all vise bodies and workpieces. Program the inter-vise rapid traverse at a safe Z-height — above the highest point of the vise body plus workpiece combination.
For a GT Series GT150A vise (50 mm body height) holding a 40 mm tall workpiece, the combined height is 90 mm above the machine table. A safe rapid traverse height is 100–110 mm above the table — sufficient clearance for the tool and tool holder.
⚠️ Important: Always verify rapid traverse clearance in simulation before running a new multi-vise program on the machine. A collision between the tool holder and a vise body during rapid traverse can damage both the tool holder and the vise — and, on a 5-axis machine, can also damage the rotary axis.
In a multi-vise program, tool length compensation (TLC) applies globally — the same tool length offset is active for all vises. This is correct when all vise beds are at the same Z-height, which is the case for a correctly installed GT Series vise bank.
If the Z-height verification (Part 4) reveals a Z-offset between vises, this offset must be incorporated into the individual work offsets — not into the tool length compensation. Adjust the Z-component of the affected vise's work offset by the measured Z-height discrepancy.
For high-volume production where two identical parts are machined per cycle, the ZQ83 Double Action Dual-Station Vise provides an alternative to a two-vise bank. The ZQ83 clamps two workpieces simultaneously with a single lead screw operation — the central fixed jaw and two movable outer jaws create two clamping stations in a single vise footprint.
The ZQ83 has two clamping stations — Station A (left) and Station B (right) — separated by the central fixed jaw. The work offset strategy is similar to a two-vise bank:
Probe Station A to establish the G54 work offset (X, Y, Z origins at the Station A workpiece position)
Measure the X-distance between the Station A and Station B workpiece centres — this is the station pitch
Calculate G55:
; Y and Z components are identical to G54
The ZQ83's integrated anti-lift mechanism and precision-ground body ensure that both stations are co-planar in Z and co-square in the XY plane — the same single-reference offset strategy applies as for a GT Series vise bank.
For maximum table utilisation, ZQ83 and GT Series vises can be combined on the same machine table. Each ZQ83 occupies the footprint of approximately 1.5 GT Series vises while providing two clamping stations — making it the most space-efficient option for high-volume production of small to medium workpieces.
The work offset strategy for a combined bank follows the same principles: probe one reference vise (or one ZQ83 station), measure all pitches, calculate all remaining offsets, verify with single probe touches.
To quantify the setup time advantage of the GT Series multi-vise approach, here is a comparison for a four-vise bank setup:
Setup task | Conventional vises | GT Series vises |
Table and T-slot cleaning | 5 min | 5 min |
Vise mounting | 10 min | 10 min |
Angular alignment (per vise) | 8 min × 4 = 32 min | 2 min × 4 = 8 min |
Z-height shimming (per vise) | 5 min × 3 = 15 min | 0 min (inherent co-planarity) |
Work offset probing (per vise) | 7 min × 4 = 28 min | 7 min (Vise 1) + 0.5 min × 3 = 8.5 min |
Verification runs | 10 min | 5 min |
Total setup time | ~100 minutes | ~37 minutes |
The GT Series multi-vise setup takes approximately 37% of the time required for the same setup with conventional vises. For a shop running two multi-vise setups per week, this represents approximately 2 hours of recovered spindle time per week — time that was previously spent on setup rather than cutting.
Efficient multi-vise setup is not primarily a technique problem — it is a vise design problem. A vise that requires individual angular alignment, individual Z-shimming, and individual work offset probing will always produce slow multi-vise setups, regardless of the operator's skill or experience.
The GT Series Precision Modular Vise is designed to eliminate these individual steps:
All-six-face grinding to 0.005 mm eliminates individual angular alignment and Z-shimming
Consistent body dimensions across the production batch enables calculated work offsets from a single reference probe
0.003–0.005 mm repeatability makes fixture offset tables valid across multiple setups without re-probing
Modular body design allows the same T-slot referencing method to be applied consistently across any number of vises
Combined with the GT Quick-Change Jaw System for fast jaw type changes between jobs, and the full range of interchangeable jaw types for different workpiece geometries, the GT Series provides a complete multi-vise workholding system that is as fast to set up as it is accurate in production.
For technical consultation on multi-vise configuration planning, work offset strategy, or GT Series model selection for your machine table dimensions, contact the Zhenghao technical team directly.
Email: zhjx@pyzhjx.com
Phone / WhatsApp: +86-18660185316
Website: www.pyzhjx.com
This depends on the machine table size and the GT Series model selected. As a general guide: a 500 × 400 mm table can typically accommodate 2–3 GT150A vises side by side along the X-axis; a 700 × 500 mm table can accommodate 3–4 GT150A vises; a 1000 × 500 mm table can accommodate 4–6 GT150A vises. For smaller workpieces, GT100 or GT125 vises allow higher density. Contact Zhenghao with your table dimensions and workpiece size for a specific configuration recommendation.
For a GT Series vise bank reinstalled in the same T-slot positions with the same mounting bolts at the same torque, the 0.003–0.005 mm repeatability means the vises will return to within 0.005 mm of their previously recorded positions. For most production applications, re-entering the recorded fixture offset table values and performing a single verification probe touch per vise is sufficient — full re-probing is not required.
Only if the vises from different manufacturers have the same body height (within 0.005 mm) and the same jaw face position relative to the body reference surfaces (within 0.005 mm). In practice, vises from different manufacturers rarely meet this standard — body heights and jaw face positions vary between brands. The single-reference strategy is reliable only when all vises in the bank are from the same production batch of the same model, manufactured to a consistent dimensional standard. The GT Series' all-six-face grinding standard makes this consistency achievable.
For precision milling and grinding applications (part tolerances ±0.01 mm or tighter), the angular alignment of each vise should be within 0.005 mm across the full jaw face length. For standard production applications (part tolerances ±0.02–0.05 mm), 0.01 mm across the jaw face length is acceptable. For rough machining or operations where positional accuracy is not critical, 0.02 mm is acceptable. The GT Series T-slot referencing method typically achieves 0.005–0.01 mm without individual adjustment.
The ZQ83 provides two clamping stations in a smaller footprint than two separate GT Series vises, with a single lead screw operation clamping both parts simultaneously. This makes the ZQ83 faster to operate per cycle (one handle turn vs. two) and more space-efficient on the machine table. However, the two GT Series vises provide more flexibility — each vise can hold a different workpiece size or jaw type independently. For high-volume production of identical parts, the ZQ83 is the more efficient choice. For mixed production or flexible setups, two GT Series vises with the Quick-Change Jaw System provide greater versatility.
