Indian lathe makers cover a broad range, from small workshop lathes to heavy-duty machines for shafts and rolls several metres long. Each maker offers set swings and bed lengths per model family, and many will lengthen a bed to order.
The two numbers you need to understand are swing and distance between centres. They decide the biggest part the lathe can hold.
What the terms mean
- Swing over bed is the largest diameter that can rotate without hitting the bed. It is roughly twice the centre height.
- Swing over cross-slide is smaller, because the carriage sits higher than the bed. This is the real limit for long parts being turned along their length.
- Swing in gap applies when the bed has a removable gap piece near the chuck, allowing short, large-diameter parts such as flanges.
- Distance between centres is the longest part you can hold between the headstock and tailstock.
- Bed length is the overall length of the bed, which is always longer than the distance between centres.
- Spindle bore is the diameter of bar that can pass through the spindle, which matters for bar work.
How makers offer sizes
Most makers publish a table per model with several bed lengths for one swing. Heavy-duty and extra-heavy-duty lines offer larger swings and longer beds, often built to order. Small and medium firms in Rajkot commonly build light and medium lathes. A smaller group builds heavy machines with wide beds and large spindle bores.
Do not choose on the headline swing alone. A large swing on a light bed may not hold weight or cut heavily. Ask for the maximum weight between centres, the bed width, and the spindle motor power in kW.
For CNC lathes, swing and turning length are usually smaller for the same footprint, because the turret and guarding take space. Check the maximum turning diameter and turning length, not only the swing over bed.
Sizing for your work
- List your largest, longest and heaviest parts, and add a margin for fixtures and future work.
- Check the spindle bore against the largest bar you will feed through.
- Check the floor space and the crane or forklift you have for unloading and installation.
- Check the container fit, because a very long bed may need an open-top or flat rack container.
- Check the foundation the maker recommends, because long and heavy lathes need a level, rigid base to hold alignment.
Longer beds to order
Many makers will extend a bed beyond their standard lengths. This is common for shaft and pipe work. Ask how the longer bed is made: as one casting, or as two sections joined and aligned on site.
A jointed bed is normal on very long machines, but alignment then depends on correct installation. Make sure the contract covers who aligns the bed at your site and how the result is tested. Our article on installation support abroad covers what to agree.
Next step
Send your part sizes and we will match them to makers who build that size well. Our guide to conventional and CNC lathes helps you choose the type first. To start, book a free sourcing review.