# Swiss Turning: Part Geometry, Support and Economics > Understand Swiss turning, guide-bushing support, live tooling and batch economics, plus the drawing and stock details a useful RFQ needs. Canonical page: https://appalachiantool.com/wiki/swiss-turning.html Updated: 2026-11-06T01:55:48Z Swiss turning is a way to manage small-part geometry and tool access, not a universal promise of a particular tolerance. The best RFQ explains the part's slender sections, cross features, material condition and production quantity. ## What changes in a sliding-headstock machine Citizen describes its Cincom L32 as a sliding-headstock CNC automatic lathe. In a guide-bushing arrangement, the bar passes through a support near the cutting zone as the headstock provides axial movement. The short unsupported section at the cut is the key concept for slender turned features. Citizen's L32 documentation distinguishes guide-bushing and guide-bushing-less configurations, rather than treating every job as requiring the same setup. [[2]](https://appalachiantool.com/wiki/swiss-turning.html#source-2) For a drawing review, identify the smallest diameters and their lengths, not just the overall length-to-diameter ratio. A relatively short part may contain a delicate stem, while a long part may remain robust through most of its length. Show where the reduced sections begin and end. That gives the shop a useful basis for deciding how to support each stage of machining. ## Separate the machine family from the installed machine ATM's equipment information identifies a Citizen Cincom L32 with main and back spindles and rotary tooling. That establishes Swiss turning as a shop capability. It does not establish that every option in a current Citizen brochure is fitted to ATM's particular machine. The exact installed configuration, usable stock diameter and operation limits should be confirmed for the proposed part. [[1]](https://appalachiantool.com/wiki/swiss-turning.html#source-1) Citizen's published L32 family includes different types with different tool arrangements and capacities. An option shown for one type must not be silently assigned to another. When comparing suppliers, ask for the proposed process and configuration rather than assuming a model-family name settles the question. [[2]](https://appalachiantool.com/wiki/swiss-turning.html#source-2) ## Look beyond cylindrical features Live tools rotate to perform operations such as milling and cross drilling while the machine controls the workpiece. A back spindle and appropriate backworking tools can provide access to the opposite end. Tsugami's manufacturer examples show how front and back operations may overlap on suitably configured Swiss machines. This illustrates the process principle; it is not a claim that ATM owns the Tsugami equipment or uses the same cycle. [[3]](https://appalachiantool.com/wiki/swiss-turning.html#source-3) Mark the orientation of flats, slots, cross holes and end features on the drawing. Identify any angular relationship between them. Include thread details and the required edge condition at intersecting holes. Ask the shop which features can be completed within the planned Swiss sequence and which would need a secondary operation. A part with many features deserves a complete operation review even if its envelope appears small. ## Specify stock in a way the process can use Guide-bushing and guide-bushing-less operation impose different stock considerations. Tsugami's documentation, for example, identifies the ability to use non-ground bars in its guide-bushing-less configuration, with capability dependent on material and cutting conditions. This does not mean all Swiss jobs require ground stock or all jobs can accept ordinary bar. The stock purchase should follow the actual machine and process review. [[3]](https://appalachiantool.com/wiki/swiss-turning.html#source-3) State the alloy designation, specification, supplied condition and any restrictions on the material source. Tell the shop whether the bar is already purchased. If it is, provide its diameter, length, straightness information and material paperwork before requesting a firm process commitment. Avoid ordering stock solely from a finished-part diameter; leave the supply decision open until the shop confirms the necessary preparation and allowance. ## Judge economics across the whole order A useful quote comparison separates initial engineering, tooling and setup from recurring production and inspection. Ask for the same quantities and delivery assumptions from every supplier. If the work may repeat, identify the expected order pattern without representing a forecast as a committed purchase. That allows an honest discussion of whether dedicated tooling or a reusable setup is justified. Request clarification on secondary operations, deburring, cleaning, outside processing and documentation. A low machining-only piece price is not directly comparable with a price covering all of those deliverables. For a prototype, ask whether the proposed route supports the likely production version or simply produces the immediate quantity efficiently. These are purchasing questions; there is no universal batch threshold at which Swiss turning becomes the least expensive answer. ## Put acceptance requirements on the features Do not replace drawing requirements with the instruction to use a Swiss machine. Record the limits on the actual diameters, lengths and geometric relationships that affect function. For delicate parts, define any handling or surface-mark restrictions. Specify how burrs at cross holes, slots and part-off ends are to be treated, particularly where the finished assembly provides little opportunity for later cleanup. Ask the quotation to identify how critical features will be inspected and what report will accompany the order. A model is useful for geometry, but it should not leave acceptance limits or the governing revision ambiguous. Where a customer standard controls the drawing, supply the applicable edition and purchase-order requirements rather than relying on a supplier's preferred default. The [drawing and tolerance guide](https://appalachiantool.com/wiki/gdt-tolerances.html) explains how to make those requirements explicit. ## Prepare an actionable Swiss-turning RFQ Include the drawing, solid model, alloy and material condition, quantity breaks, delivery needs and inspection deliverables. Highlight slender sections, cross features, end-to-end relationships and surfaces that must remain free of gripping marks. Identify any operations already completed and any material you will supply. If there is an approved existing part, explain whether it is a reference sample or a formal acceptance standard. Review the [ATM equipment register](https://appalachiantool.com/equipment.html) alongside the [Swiss-turning capability overview](https://appalachiantool.com/capabilities.html). Then [request a Swiss-part manufacturing review](https://appalachiantool.com/contact.html) that confirms the installed machine configuration and the complete route. The objective is an agreed, inspectable finished part, with stock and process assumptions visible in the quote. ## Questions before you quote ### Is Swiss turning only for long parts? No. Slender sections are an important use case, but live tooling and backworking can also make the process relevant to short parts with several features. ### Does Swiss turning guarantee a fixed tolerance? No. Acceptance limits belong on the drawing and require review against the part, material, setup and inspection method. ### Must Swiss turning always use ground bar? No universal rule applies. Stock preparation depends on the installed guide-bushing arrangement and the planned machining process. ## Sources and technical basis 1. [ATM equipment register and owner-supplied capability brief (reviewed November 5, 2026)](https://appalachiantool.com/equipment.html) 2. [Citizen Machinery: L32 sliding-headstock manufacturer brochure](https://citizenmachinery.co.uk/wp-content/uploads/2026/05/L32-L_R.pdf) 3. [Tsugami: SS26 / SS32 manufacturer brochure, operation and stock principles](https://www.tsugamiamerica.com/wp-content/uploads/SS263232L-2.pdf) ## Related guides * [Gdt tolerances](https://appalachiantool.com/wiki/gdt-tolerances.html) * [Material machinability](https://appalachiantool.com/wiki/material-machinability.html) * [Surface finish ra](https://appalachiantool.com/wiki/surface-finish-ra.html) [Request a part-specific machining review](https://appalachiantool.com/contact.html?intent=wiki-swiss-turning)