The three-way choice is written up in full servo vs hydraulic. This note is only the middle step: stay on oil for the forming stroke, or delete it.
HSS against FS on the same platen idea
| HSS hydraulic-servo | FS full servo | |
|---|---|---|
| Speed | 32–42 cpm | 40–50 cpm |
| Nameplate | 80–105 kW | 95–120 kW |
| Forming force | Hydraulic | Servo |
| Example | HSS-8556 850×560 mm, 180 mm | FS-8556 850×560 mm, 180 mm |
Choose HSS when the draw is deep, the plant already changes hydraulic seals, and 32–42 cpm covers the filler. Choose FS when the cup is a high-volume water cup, electricity is expensive, and you do not want an oil loop next to a food line. A pure LS hydraulic at 25–38 cpm and 65–90 kW is still the right first machine if nobody on site has opened a servo drive.
Worked split — 180 mm food jar
Depth forces you off FS-7836 (120 mm) and onto an 850 mm class. If the jar is 15 million pieces a month and the crew is hydraulic, HSS-8556 is the quote. If the same jar is 30 million and the line runs three shifts, price FS-8560 and check cavities with the pitch layout before you pay for area you will not fill.
Say which constraint is real
- Draw depth in millimetres, not “deep cup”
- Good pieces per month
- Who repairs the machine today
- Whether oil next to the filler is forbidden
- Electricity tariff band
Frequently asked questions
What speed should I plan on HSS?
The page says 32–42 cycles/min. Year-one output is often the low end until cooling and the crew settle. Do not staff a filler to 50 cpm on an HSS.
Does HSS still use hydraulic oil?
Yes, for forming force. Feed and some strokes are servo, so sheet index is steadier than a pure LS hydraulic press.
Which HSS reaches 180 mm?
HSS-8556 is 850×560 mm, so max depth is 180 mm. HSS-7836 is 780×360 mm and 120 mm. The family name does not set the depth.
When is FS worth the extra power?
When you need 40–50 cpm, want the drive energy down, and have someone who can service servo drives. Nameplate power is 95–120 kW versus 80–105 kW on HSS.