VAJRA TECHNO
Machining Capabilities, Tolerances and Inspection
Vajra Techno machines to customer drawings on vertical and horizontal machining centres at Dewas, Madhya Pradesh, in grey cast iron, ductile iron, aluminium, mild steel and SS304/316, and supplies finished parts pan-India. This page states the capability, the materials and how every feature is verified.
Capability is published as envelope and specification. Machine make, model and brand are deliberately not listed: what decides whether your part can be made is the working envelope, the achievable tolerance and the inspection method, not the nameplate on the casting.
How do I know my part fits?
Send the part envelope — overall length, width, height and weight — with your drawing. You get written confirmation that it fits the cell, and which cell it goes to, before anything else is discussed. That answer comes back the same working day and costs you nothing.
| Specification | Vertical machining (3-axis) | Horizontal machining (4th-axis rotary) |
|---|---|---|
| Axis configuration | 3-axis simultaneous (X, Y, Z) | 3 linear axes plus a 4th-axis rotary table |
| Typical operations | Face milling, contour milling, pocketing, drilling, reaming, tapping, counterboring | Multi-face milling in one clamp, line boring, flange facing, port drilling |
| Part geometry suited | Features concentrated on one face: plates, covers, brackets, end shields, die plates | Features on several faces: gearbox housings, pump bodies, valve bodies, manifold blocks |
| How face-to-face position is held | By re-fixturing on a machined datum face plus two locating holes | By the rotary axis, in a single clamp, with no re-location between faces |
| Setup characteristic | Faster setup, lower piece price, suited to single-face and prototype work | Higher setup, repaid across a batch, removes setup-to-setup error stack |
| Maximum part envelope (X x Y x Z) | Confirmed on enquiry | Confirmed on enquiry |
| Axis travels, X / Y / Z | Confirmed on enquiry | Confirmed on enquiry |
| Table size | Confirmed on enquiry | Not applicable - pallet mounted |
| Pallet size | Not applicable - table mounted | Confirmed on enquiry |
| Spindle taper | Confirmed on enquiry | Confirmed on enquiry |
| Maximum spindle speed | Confirmed on enquiry | Confirmed on enquiry |
| Maximum part weight | Confirmed on enquiry | Confirmed on enquiry |
| Rotary indexing increment | Not applicable | Confirmed on enquiry |
Which route does a part take?
Parts with the majority of features on one face go to vertical machining: setup is faster and the piece price lower. Parts with features on several faces that must hold position relative to each other go to horizontal machining, where fourth-axis indexing machines those faces in one clamp and removes the setup-to-setup error stack.
The route is chosen from your drawing, not from what is free on the day. Where a part could go either way, the decision is made on which route holds the print tighter.
Which materials are machined, and what is each used for?
| Material | Typical parts machined | How it is handled |
|---|---|---|
| Grey cast iron | Pump bodies, gearbox housings, valve bodies, bearing housings, brackets | Fine abrasive chips: routed horizontally where the geometry allows, so chips fall clear of the cut and bore finish stays consistent across a batch. |
| Ductile iron (SG iron) | Load-bearing housings, hubs, carriers, bearing caps | Tougher and more ductile than grey iron. Cutting parameters set for the grade; same process discipline as grey iron. |
| Aluminium | Manifold blocks, covers, motor end shields, light structural brackets | High material removal rate. Workholding planned to avoid clamp distortion on thin sections. |
| Mild steel | Base plates, mounting frames, machined weldments, fixture bodies | Machined weldments are stress-relieved before finishing where the drawing calls for it, to stop post-machining movement. |
| Stainless steel 304 / 304L | Corrosion-exposed fittings, housings, valve bonnets, gland followers | Work-hardens under a rubbing tool. Feed is kept positive and depth of cut maintained so the tool cuts rather than burnishes. |
| Stainless steel 316 / 316L | Chemically-exposed and marine-duty parts, manifolds, seal housings | As 304, with lower machinability again. Sequence and tooling planned for the grade at process-planning stage. |
Materials outside this table — brass, gunmetal, tool steels, engineering plastics — are quoted case by case. Send the grade with the drawing and you get a yes or no before you spend time on the enquiry.
What tolerance will you commit to on my part?
The tolerance we accept is the tolerance on your print. Every drawing is read for tolerance, datum scheme and critical features before the quotation goes out, and the achievable band on each critical feature is confirmed to you in writing at that point.
This is deliberate. Achievable tolerance is not one number for a shop — it moves with material, feature type, wall section, number of setups and the fixturing route. A blanket figure published on a website tells a sourcing engineer nothing about whether their bore will hold. A written commitment against their specific feature does.
Tight callouts are reviewed individually before the order is accepted. Where a print calls a band that the process will not hold repeatably, we say so at quotation and propose the route that will — rather than accepting the order and missing it in production.
How is each feature inspected?
Every new part is first-article inspected against every dimension on the print, not just the critical ones, with a written report supplied before batch release. Production runs only after you approve that report. In-process checks then run at an agreed frequency on the features the drawing marks critical.
| Characteristic verified | Method | When |
|---|---|---|
| External diameters and thicknesses | Micrometer, set against a known master | First article, then at agreed frequency in production |
| Bore diameter, ovality and taper through depth | Bore gauge or inside micrometer, zeroed on a setting master | First article, then every critical bore at agreed frequency |
| Lengths, step sizes and depths | Vernier caliper and depth micrometer | First article, then at agreed frequency |
| Feature and bore centre heights from a datum face | Height gauge worked from a granite surface plate | First article on every new part |
| Runout, concentricity and parallelism | Dial indicator against the datum axis or datum face | First article, and every setup on rotating components |
| Flatness and squareness of machined faces | Surface plate and dial indicator | First article, and on every sealing or jointing face |
| Machined thread acceptance | Thread plug and ring gauges, go / no-go | Every threaded feature, every part |
| Bore and shaft acceptance in production | Plug and snap gauges, go / no-go | In-process, at agreed frequency through the batch |
| Instrument setting and calibration masters | Slip gauge set and setting masters | Before each inspection session |
| Surface roughness (Ra), hardness, and full-form CMM reporting | Routed to an external laboratory when the drawing calls for it, report supplied with the consignment | On request, or when the drawing specifies it |
What secondary processes are available?
Machining on vertical and horizontal machining centres is performed in-house, under our own process control. The following are quoted on request as part of a finished-part price, with the process route and lead-time impact confirmed in writing before the quotation is issued:
- Turning, cylindrical grinding and centreless grinding
- Heat treatment — induction hardening, through hardening, case carburising, nitriding
- Surface treatment, plating and painting
- Pressure and leak testing
- Cleanliness verification to a particle-count standard
State the required secondary process on your enquiry. It is priced into the job at quotation rather than added after the first article.
What quality process is in place?
Documented first-article inspection against every print dimension, with a written report and no batch release before your approval. A fixed process plan per part, so the operation sequence does not drift between batches. In-process checks at agreed frequency on critical features. Machining to the drawing revision stated on the purchase order, with any later revision treated as an engineering change and re-quoted if it affects process.
Where a drawing calls for a measurement outside our in-house scope, the check is routed to an external laboratory and the report supplied with the consignment.
What capacity is available?
Availability moves month to month against the order book, so it is confirmed against your specific delivery date at enquiry rather than published as a static figure. A delivery date is committed on the order acknowledgement, not on the enquiry. Ask for current availability when you send the drawing.
Where is this capacity supplied from?
All machining is performed at Dewas, Madhya Pradesh, on the Indore industrial belt, with road connectivity to Maharashtra, Gujarat, Rajasthan, NCR and the southern manufacturing clusters. Finished parts are dispatched pan-India by road, on paid or to-pay freight terms, or through a buyer-nominated transporter. GSTIN 23ABBFV9045J1ZY. Full contact detail is on the contact page.