You do not need 30 lb on a bathroom scale. You need the bed compressed and level. The ranking thread for this query is literally “calibrated 30lbs OR super tight fit?” — and the replies pick fit and leveling. HomeBaristaMods does not print 30 lb on the tamper page. It prints 51 / 53 / 58.5 mm and a spring press at €39. Buy the diameter that wipes the wall; do not buy a number that coffee forums retired.
30 lb is a legacy teaching number
Barista school cards used 30 lb because it was easy to say. The first organic thread treats it as debunked. Sister threads citing 10–30 lb tests say once the air is out of the bed, extra pounds do not show up as TDS. Under-tamping (not actually compressing) is the failure mode, not “only 28 lb.”
| 宣称 | 真实 | 出处 | 差在哪 |
|---|---|---|---|
| Espresso requires 30 lb | Level + enough compression. 30 lb is not a golden SI unit | r/espresso | Heuristic |
| A 30 lb click beats a 58.5 mm snug base | Thread picks tight/level over the number | Same | Fit vs force |
| HBM’s spring is a 30 lb cert | PDP: repeatable press, three diameters, €39 | Tamper PDP | Missing number is the point |
A too-tight base that vacuums the puck on the way out is a real fault. That is a 58.5 vs 58.0 problem, not a spring-color problem.
What to buy instead of a 30 lb story
If the plastic Classic tamper leaves a ring, order 58.5 mm, not a heavier spring. If your tamp lists, a collar / spring tool is the spring vs regular question. If two people share the machine and their force disagrees, a click can be a people-standard. It is still not 30 lb physics.
Dedica stays 51 mm. Do not put 30 lb into a 58.5 mm base on a 51 mm basket.
OPV and grind still outrank the scale
A Classic that sprays at 12 seconds is usually grind or a high OPV ceiling, not 22 lb vs 30 lb. Read does the Pro need a 9 bar spring before you buy a calibrated toy.
Frequently Asked Questions
How hard should I tamp?
Until the bed is compressed and level. Most people are in a 10–30 lb feel band. The exact integer is not the drink.
Is 30 lb harmful?
Once compressed, extra force does little. A crooked 40 lb tamp is still crooked.
Does HomeBaristaMods sell a 30 lb tamper?
No 30 lb figure on the PDP. 51 / 53 / 58.5 mm, €39 spring press.
Tight fit or calibrated force?
Ranking thread: fit and level first.
Can a spring tamper enforce 30 lb?
Rim-collar tools enforce a depth / rim stop, not a certified newton-metre.
Brewing tools: that category.