Frequently Asked Questions

Bright bar peeling (also called bar turning or proof machining) is a precision machining process where a cutting tool removes the outer skin of a stainless steel round bar to achieve a tight diameter tolerance, improved surface finish, and consistent roundness. As-rolled or as-forged bars have surface scale, decarburisation, and dimensional variation. Peeling removes these defects, producing a clean, bright bar ready for further machining or final use.

Our peeling machines cover Ø70 mm to Ø300 mm (bars up to 9 metres long). Our straightening and polishing machines handle Ø70 mm to Ø180 mm. Our band saw handles end cutting for Ø100 mm to Ø400 mm. Contact us if your diameter falls outside these ranges.

We routinely process SS 304, SS 304L, SS 316, SS 316L, SS 303 and the 400 Series (410, 420, 430). We specialise in grades most job workers refuse — 316L, 303 and 400 Series. We do not work with mild steel, alloy steel, cast iron or aluminium.

Process loss is the material removed as metal chips and turnings during peeling. For round bars it is calculated by the volumetric formula: Loss % = (1 – D₂² / D₁²) × 100, where D₁ is the input diameter and D₂ is the output diameter. For example, peeling Ø200 mm down to Ø185 mm removes approximately 14.4% of the input weight. We provide a signed process loss certificate with every batch.

No. We are a pure labour job worker. You send your bars to our workshop in Khopoli, we peel, straighten and polish them, and return the finished bars to you or dispatch them to your customer. We do not buy or sell any material.

A standard batch of 5,000 kg is processed and dispatched within 5 working days from material receipt. Smaller batches (under 1,000 kg) are often completed in 2–3 days. We send a quotation within 2 hours of your enquiry during business hours.

Yes. We receive material from across India — Gujarat, Rajasthan, Uttar Pradesh, Tamil Nadu, Karnataka, Telangana and more. Material can be sent via road transport (truck) to our Khopoli workshop. E-Way Bill is mandatory for interstate consignments; we assist with return EWB on dispatch.

Every processed batch ships with: (1) GST labour invoice with HSN code, (2) delivery challan, (3) e-Way Bill for the return consignment, and (4) a process loss certificate showing input weight, output weight, scrap weight, and loss percentage. No paperwork headache for your accounts or logistics team.

There is no strict minimum, but a practical minimum is around 500 kg or 2–3 bars. Very small quantities may attract a handling surcharge. We are happy to discuss your specific requirement — WhatsApp or call us to check.

Fill in our online quotation form with your bar specification — grade, input diameter, output diameter, approximate quantity per month, and dispatch location. We respond with a formal PDF quotation on our letterhead within 2 business hours (Mon–Sat, 9 AM–6 PM IST). You can also WhatsApp +91 88063 14925 or call us directly.

We are at Plot 64, Khopoli Industrial Co-operative Estate, Khopoli, Khalapur Taluka, Raigad District, Maharashtra 410203 — close to the Mumbai–Pune Expressway (NH-48), about 80 km from Mumbai and 90 km from Pune.

Yes. R R Engineering Works is ISO 9001:2015 certified for quality management. Dimensional inspection is carried out at every process stage using calibrated verniers and micrometres. No bar leaves our workshop without being measured.

Peeling removes the outer skin of the bar to achieve tight diameter tolerance and clean surface. Straightening (hydraulic press) corrects any bow or bend in the bar to ≤0.5 mm per 1000 mm. Belt polishing improves surface finish further — from Ra 3.2 µm after peeling to Ra 0.4 µm or mirror finish. All three operations can be combined in one job.

When a large diameter reduction is needed — for example, Ø200 mm to Ø150 mm — it cannot be achieved in a single pass without tool damage or poor surface finish. Multi-pass peeling takes the bar down in 2–4 passes of 7–15 mm per pass. Each pass is measured before the next. This produces a better finish and tighter tolerance than a single aggressive cut.