Drilling Speed & Feed — Gray Cast Iron
HSS drill RPM, feed and time-per-hole for Gray Cast Iron from handbook cutting data.
Iron drills dry with powdery chips — no chip packing means deeper holes per peck. The abrasive dust kills margins, so check drill diameter wear when holes start drifting undersize.
Formula
Note: Catalog starting values only — always confirm against your tool maker's data sheet and cut a test part. Machine rigidity, coolant and workholding shift real-world numbers.
HSS drill RPM, feed and time-per-hole for Gray Cast Iron from handbook cutting data. A free cnc machining: speeds, feeds & tool wear tool — no sign-up, no upload, instant results in your browser.
About Drilling Speed & Feed — Gray Cast Iron
Drilling Speed & Feed — Gray Cast Iron computes the governing relationship n = 1000·Vc/(π·D) · vf = n·fr · t = depth/vf live as you type. Iron drills dry with powdery chips — no chip packing means deeper holes per peck. The abrasive dust kills margins, so check drill diameter wear when holes start drifting undersize. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Drilling Speed & Feed — Gray Cast Iron
- 1Enter your values — Drill diameter D, Cutting speed Vc, Feed per rev, Hole depth (sensible defaults are pre-filled).
- 2Read the live results: Spindle speed, Plunge feed, Time per hole.
- 3Check the "with your numbers" line to see n = 1000·Vc/(π·D) · vf = n·fr · t = depth/vf substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Drilling Speed & Feed — Gray Cast Iron?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula n = 1000·Vc/(π·D) · vf = n·fr · t = depth/vf with authoritative sources cited on the page (Machinery's Handbook, 31st ed. — Speeds and Feeds; Kalpakjian & Schmid, Manufacturing Engineering and Technology, 7th ed., ch. 21)
- ✓Iron drills dry with powdery chips — no chip packing means deeper holes per peck.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the drilling speed & feed — gray cast iron use?+
It evaluates n = 1000·Vc/(π·D) · vf = n·fr · t = depth/vf, exactly as published. Sources: Machinery's Handbook, 31st ed. — Speeds and Feeds; Kalpakjian & Schmid, Manufacturing Engineering and Technology, 7th ed., ch. 21. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Iron drills dry with powdery chips — no chip packing means deeper holes per peck. Catalog starting values only — always confirm against your tool maker's data sheet and cut a test part. Machine rigidity, coolant and workholding shift real-world numbers.
When is this calculator the right tool for the job?+
HSS drill RPM, feed and time-per-hole for Gray Cast Iron from handbook cutting data. A free cnc machining: speeds, feeds & tool wear tool. The abrasive dust kills margins, so check drill diameter wear when holes start drifting undersize. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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