The minimum stock size that can be safely held depends on the workholding setup and how the part is supported during machining. This system uses a 3-jaw chuck and tailstock support, so the practical lower limit is driven less by the machine itself and more by how much secure jaw engagement you can maintain without distorting or slipping the stock.

In real lab use, the smallest “safe to hold” diameter is mainly influenced by:

• how much jaw contact length you have (and whether you can grip on a larger sacrificial section)
• stick-out length from the chuck and whether the tailstock is used for support
• material strength and cutting forces for the geometry you are machining
• surface condition, scale, or coatings that reduce grip

For very small diameters, a common approach is to keep the unsupported length short, support the free end with the tailstock, and machine the reduced gauge section away from the clamping area so the chuck is always gripping a stiffer section of stock.

If you want to confirm the right workholding approach for your smallest diameter and specimen style, please learn more and request a quote with your starting stock diameter, length, and specimen standard.