Quick Answer

Most grinding should run on the machine's own weight with no extra down-pressure. Let the diamond segments shear the surface; pushing down forces the bond into the concrete, glazes segments, and wears tooling unevenly. Add weight only for heavy coating removal, and remove it for finishing passes.

What Pressure Does to the Cut

• Too light — the disc skates and makes slow, shallow passes.
• Machine weight only — diamonds bite consistently and tool life is best.
• Too heavy — the bond glazes, the disc stops cutting, and heat builds.

The ideal is a steady, even bite across the segments — you should hear and feel the cut, not push it.

When to Add Weight

• Coating removal with PCD tooling — heavier contact helps PCD shear thick mastics.
• Very hard, dense concrete where machine weight alone cuts too slowly.
• Worn segments that need more bite before replacement.

Add weights in small increments and test for 5-10 minutes before committing.

Signs You Are Using Too Much Pressure

Signal	Cause	Fix
Segments glaze and polish instead of cut	Too much heat from pressure	Lift the machine, lighten pressure, and check bond choice
Discs wear unevenly on one side	Operator pushing or twisting	Keep the machine flat and moving in a straight line
Floor shows burn marks	Pressure plus high RPM	Slow down and lighten up
Very slow pass with lots of dust	Segments cutting rather than shearing	Re-dress segments and reduce weight

Pressure per Job Stage

• Coarse metal: full machine weight; add weight only for coatings.
• Medium metal: machine weight, even speed.
• Resin pads: lighter — resin pads overheat fast under pressure.
• Final polish: minimal pressure, higher speed, short dwell.

A balanced segment layout, like the Double Zigzag Segment Diamond Trapezoid Grinding Disc (JOY-TP-ZG2), spreads load evenly so you do not have to push to cut.

Frequently Asked Questions

Q: Should I add weight to my floor grinder?

A>Only for coating removal or very hard concrete. For normal grinding, machine weight is correct.

Q: How do I know the pressure is right?

A: The disc cuts steadily without the operator pushing, the machine does not vibrate harshly, and segments stay cool to the touch.

Q>Does more pressure remove more concrete per pass?

A>Up to a point, but it glazes the bond and shortens disc life. Steady passes at machine weight often remove more per square meter over the tool's life.

Q: Why do my resin pads burn?

A: Resin pads burn from pressure and dwell. Lift the machine, move faster, and let the pad work at its own speed.

Conclusion

Let the machine and the diamond do the work. Use machine weight as the default, add weight only for coatings, and read the signals — glaze, burn, uneven wear — to adjust. Ask JOY TECH for a disc whose segment pattern and bond suit your machine's weight class, such as the Diamond Trapezoid Grinding Disc (JOY-TP-R3).