JZP-3.0B-SC Rubber Shock Absorber Millisecond Rebound 3kg Load 46mm Diameter 30mm Height

Rubber isolators are often bought on a single load number, then found to be wrong on site. This page therefore states every figure together with the condition it was measured under, so the part can be checked against a real application instead of a headline claim. The JZP-3.0B-SC is the 3.0 kg member of the JZP-B-SC body family, which runs from 1.0 kg to 6.0 kg in the same 46 mm by 30 mm envelope.

• Fast cycling without positional drift. A shock pulse deforms the rubber; what matters for a machine that repeats a stroke thousands of times per hour is how quickly the element comes back. This mount returns within milliseconds with no measurable lag, so the reference position of a head, stage or sensor does not creep between cycles and the control loop does not spend its time re-zeroing.
• Space is usually the reason a project fails. A 46 mm diameter body at 30 mm height fits into enclosures, camera boxes, instrument housings and panel-mounted assemblies where a spring or wire rope mount cannot be squeezed in without cutting sheet metal or raising the centre of gravity.
• Two mounting interfaces in one part. The M4 insert takes a screw from below or above; the ⌀ 5.5 mm hole takes a through bolt when a bracket or a clamp plate is preferred. Both are on a 40 mm pitch, so the same footprint carries any load in the family.

Work in four steps. First, count the mounts: divide the supported mass by the 3.0 kg rating and use at least that many support points, keeping the load on each one inside the rating. Second, measure the static deflection of your own assembly and calculate the natural frequency from f = 15.76 / √δ, with δ in millimetres. Third, confirm that the excitation frequency of the machine sits above 1.41 times that natural frequency, which is the 15 - 50 Hz working band for this part. Fourth, verify that the result stays inside the band after the temperature correction at the operating extremes.

Where the four step result falls outside the band, the answer is normally a different load rating rather than a different design, because the whole family shares the same envelope and fixing pattern.

• Load the rubber in compression, vertically, with the mass above the element. Do not hang the equipment from the insert.
• Use all four base fixings on a flat, machined surface. A warped base plate pre-stresses the rubber and moves the natural frequency.
• Tighten M4 fasteners to the torque recommended for the insert material by the fastener supplier, in a cross pattern, and never past the insert rating.
• Leave a clearance gap around the body so the element can deflect without touching the enclosure wall.
• Route cables and hoses with a slack loop so they cannot become a rigid bridge under load.
• Re-check torque after the first operating week, then at the normal service interval.

Pick and place heads and small robots, scanning and measuring stages, optical and sensor housings, panel mounted electronics inside compact enclosures, small compressors and pumps, laboratory instruments, medical device sub-assemblies, transport crates for precision equipment, and machine guards that must not drum.