Technocast Foundry casts machine beds and bases, columns, saddles, headstock housings, tables and faceplates in grey cast iron, ductile (SG) iron and steel, up to 1,500 kg in a single piece. Stress relieved, machined and measured on one site at Arasur, Coimbatore, Tamil Nadu, India.
Machine Tools
Grey iron structures that have to stay flat, straight and quiet for the life of the machine.
Machine tool work is about a tenth of what we pour, and Coimbatore is the right place for it - the district is one of India’s larger engineering and machine-building clusters, and our plant is at Arasur inside it. Typical parts are machine beds and bases, columns and uprights, saddles and slides, headstock and spindle housings, tables, faceplates and drive housings.
Machine tool structures are grey iron for one reason: grey iron damps vibration. Graphite flakes absorb the chatter that would otherwise show up in the surface finish of your customer’s part. We pour EN-GJL-250 to EN-GJL-300, and heavier structures run on the Alpha-set No Bake line and floor moulding at 2,000 x 2,000 x 700 mm, up to 1,500 kg in a single piece.
The thing that decides a machine tool casting is not the pour, it is what happens next. A bed that has not been stress relieved will move after it is machined, and the geometry goes with it. Stress relieving, normalising, annealing, hardening and tempering, and induction hardening are all done on site, then the part is machined on the vertical turn mill to 1,750 mm and proven on a Brown and Sharpe coordinate measuring machine. Approvals in this sector are held with precision equipment and machine building customers.
What We Make
Grey iron structures, poured on the No Bake and ARPA lines and finished on our own machine tools.
Why Machine Builders Come Here
Consistent grey iron, a properly settled casting, machining reach and measured geometry. Get any of the four wrong and the machine never holds tolerance.
EN-GJL-250 to EN-GJL-300, checked on an ARL spectrometer at every heat. Grey iron is about 30 per cent of our monthly output, so this is routine work here rather than an occasional job.
A bed that has not settled will move after machining and take the geometry with it. Stress relieving, normalising, annealing, hardening and tempering, and induction hardening are all done at Arasur.
Vertical turn mill to 1,750 mm cutting diameter and 1,100 mm height, five vertical turret lathes to 850 mm cutting and 1,000 mm swing, 20 VMC and 4 HMC including a five-axis. Beds and columns are finished here.
Flatness, squareness and bore positions are measured on a Brown and Sharpe CMM at 1,500 x 1,200 x 1,000 mm with a scanning probe, backed by contour testing and ring gauge masters.
Specifications
Send a drawing and we will confirm against your part. The figures below are the working envelope at Arasur, Coimbatore.
| Item | What We Offer |
|---|---|
| Materials | Grey cast iron EN-GJL-250 to EN-GJL-300 for structures, ductile (SG) iron EN-GJS-400-18 to EN-GJS-900-2 and cast steel to IS 1030 and ASTM A27 / A148 / A216 where strength is needed |
| Typical part weight | 1 kg to 1,500 kg in a single piece |
| Moulding routes | Alpha-set No Bake fast loop line and floor moulding for large structures, ARPA 450 and ARPA 1300 for mid weights, DISA high pressure for smaller volume parts |
| Largest moulding box | Floor moulding at 2,000 x 2,000 x 700 mm |
| Heat treatment | Stress relieving, normalising, annealing, hardening and tempering, and induction hardening |
| Machining | Vertical turn mill to 1,750 mm cutting diameter and 1,100 mm height, five VTL to 850 mm cutting and 1,000 mm swing, 20 VMC with 4th axis, 4 HMC, 13 turning centres |
| Gear work | Gear shaping to 500 mm diameter and 90 mm height on a Fellows machine, plus dynamic balancing to 1 gram |
| Measurement | Brown and Sharpe CMM at 1,500 x 1,200 x 1,000 mm with scanning probe, contour testing and ring gauge masters |
| Supply condition | Raw casting, stress relieved, machined, or painted and assembled |
Applications
Six part families we run for machine tool and special-purpose machine builders.
Large grey iron structures up to 1,500 kg, floor moulded with ribbed sections for stiffness, stress relieved, then machined flat and measured on the CMM.
Tall cored structures where squareness to the bed decides the machine’s accuracy. Machined on the horizontal centres so faces stay true to each other.
Moving members that carry the axis. Ways can be induction hardened where the drawing calls for it, so the slide surface lasts.
Cored housings where bore alignment and roundness set spindle runout. Bored on the vertical turn mill and proven with ring gauge masters.
Round and rectangular grey iron tables, turned on the vertical turn mill to 1,750 mm diameter, then slotted and ground flat.
Cased parts in grey or ductile iron, gear cut on the Fellows shaper to 500 mm diameter and balanced to 1 gram where needed.
Quality Gates
Six checks between the furnace and the packing bay. On a machine structure, graphite structure and geometry are the two that matter most.
Every heat is read on an ARL spectrometer before pouring. Grey iron chemistry controls the graphite structure, and the graphite structure is what damps vibration.
Checked under a microscope with image analyser for flake type, size and distribution, because that is what decides damping and machinability.
Tensile strength and hardness on samples poured from the same heat as your casting, with digital micro Vickers for local readings.
Flatness, squareness and bore positions measured on the 1,500 x 1,200 x 1,000 mm Brown and Sharpe CMM with a scanning probe.
Ultrasonic and magnetic particle inspection in house. Radiographic inspection through an accredited partner when the drawing calls for it.
Stress relief records, geometry report, then paint, packing and the documentation pack for your incoming inspection.
Common Questions
At 127/3B, Sangothipalayam Road, Arasur, Coimbatore, Tamil Nadu 641407, India – inside one of India’s larger engineering and machine-building clusters. Foundry, heat treatment, machine shop and metrology are all on one 523,200 sq ft site.
Machine beds and bases, columns and uprights, saddles and slides, headstock and spindle housings, tables and faceplates, and gearbox and drive housings.
Grey iron damps vibration. The graphite flakes absorb chatter that would otherwise show up in the surface finish of the part your machine is cutting. We pour EN-GJL-250 to EN-GJL-300.
Yes, on site. A bed that has not settled will move after machining and take the geometry with it, so stress relieving is done here rather than sent out.
Up to 1,500 kg in a single piece, floor moulded at 2,000 x 2,000 x 700 mm.
Yes. The vertical turn mill cuts to 1,750 mm diameter and 1,100 mm height, with five vertical turret lathes to 850 mm cutting and 1,000 mm swing, 20 vertical machining centres and 4 horizontals including a five-axis.
Flatness, squareness and bore positions are measured on a Brown and Sharpe coordinate measuring machine at 1,500 x 1,200 x 1,000 mm with a scanning probe, backed by contour testing and ring gauge masters.
Yes. Induction hardening is available where the drawing calls for a harder wearing surface on slides and ways.
Yes. Machine tool work is around a tenth of total output and covers machine builders and precision equipment manufacturers. Buyers in Coimbatore and across Tamil Nadu are welcome to audit the plant at Arasur.
Certifications
Send a Drawing
Send the drawing with the grey iron grade, the single-piece weight, the stress relief requirement and whether you want it raw or machined. You get back the moulding route, a lead time and a price.
Before you go
Our brochure and every current certificate, in PDF, for your vendor file.
Or send us a drawing
