JRob Tool and Die and Machine Inc

07/21/2026

Wrong spindle speed snaps tools and burns surfaces. The cutting speed formula gets it right every time — regardless of workpiece diameter.

CUTTING SPEED AND SPINDLE RPM FORMULA:

Spindle Speed: N (RPM) = (Vc × 1000) / (π × D)
Cutting Speed: Vc (m/min) = π × D × N / 1000

Where: Vc = recommended cutting speed | D = workpiece diameter (mm)

WORKED EXAMPLE: Mild steel | HSS tool | D=50mm | Vc=80 m/min

N = (80 × 1000) / (π × 50)
N = 80,000 / 157.1
N = 509 RPM

RECOMMENDED CUTTING SPEEDS (m/min):
Mild steel + HSS tool: 30–80 m/min
Mild steel + carbide tool: 150–300 m/min
Aluminum + HSS: 100–200 m/min
Cast iron + HSS: 20–50 m/min
Stainless steel + HSS: 15–30 m/min

Key rule: SMALLER diameter = HIGHER RPM required for the same surface speed. A 10mm drill needs 10× the RPM of a 100mm cutter running at the same cutting speed.

Save this — cutting speed calculation reference.

07/20/2026

From idea to reality. 💪⚙️🔧

Built a custom Bubble Cannon Mount for Big Poppa Bubble so the cannon can securely mount the bubble mobile and be ready for events in seconds.

Every project is different, and that’s what we enjoy most—designing and machining custom solutions that work.

07/02/2026

Turning raw material into solutions.
Custom machining, repairs, and replacement parts.

06/23/2026

Customer ordered a bed online. Missing one bracket that wasn’t available to purchase.

Made a custom replacement and got them back up and running.

If you can’t find the part, we may be able to make it.

06/22/2026

06/11/2026

Broken bolts suck. Getting them out sucks more. Using a hammer when you need a press is formula for disaster. We got the skills and the tools… Hit us up!

06/10/2026

One board. A lot of paint. Countless hours of hard work.

The JRob Tool & Die & Machine Inc. sign is officially coming to life. 🔧⚙️