Tri Tool 308 Tube Squaring Machine
The Tri Tool 308 is a tube squaring machine for 1.000–8.625-inch OD tubing (25.4–219.1 mm), with listed walls up to 0.250 inch (6.35 mm). Its 2-inch feed travel and three tool positions support compatible facing, beveling and counterboring operations. Ask Justram to confirm the supplied machine and clamping configuration.
End preparation for larger tube diameters
The Model 308 holds the workpiece externally with suitable saddles or an optional collet arrangement. The feed advances the cutting head for tube squaring and selected combined preparations. A bench setup supports repeated work on straight tube and fittings that can be securely clamped.
Model 308 specifications
| Specification | Listed value |
|---|---|
| Tube outside diameter | 1.000–8.625 in (25.4–219.1 mm) |
| Maximum listed wall thickness | 0.250 in (6.35 mm), subject to material and operation |
| Axial feed travel | 2.000 in (50.8 mm) |
| Cutting-head positions | Up to three tools |
| Standard saddle gripping length | 2.50 in (63.5 mm), per model catalogue |
| Optional short-perch gripping length | 0.50 in (12.7 mm), with the appropriate saddle |
| Listed machine weight | 85 lb (approximately 38.6 kg); confirm package |
These figures describe the Model 308 configuration in the referenced literature. Current STS-8 literature has different mounting, feed and weight specifications; confirm the exact model and accessories being supplied.
Choose the clamping and cutting tools
Provide actual tube OD, wall thickness and the straight length available for gripping. Fittings require a suitable support arrangement and adequate cutter clearance. Collet clamping requires a compatible adapter and collet; confirm those parts in the quotation.
Specify the bevel angle, land, counterbore or ID-deburring details. Combined operations depend on bit geometry, feed travel and the available clearance. Select the electric drive and controls for the site power supply.
Material and cleanliness requirements
Carbon steel, stainless steel, chrome alloys, copper-nickel and aluminium require suitable bits and cutting conditions. Inconel and other high-temperature alloys may need special procedures. For electropolished or high-purity tubing, specify contact materials, cleanliness and lubrication requirements and inspect the prepared edges.
Technical reference and quotation
The manufacturer-authored Model 308 operating manual, revision 961122 (PDF) is a legacy reference. Compare the smaller Model 306 or ask Justram to review the required machine generation, clamping kit and drive for your workpiece.
