What is a tub grinder? Uses, benefits, and buying tips for farms
What Is a Tub Grinder? Uses, Benefits, and Buying Tips for Farms
Every livestock operation eventually hits the same wall: turning bulky straw, cornstalks, or dense round bales into usable feed or bedding fast enough to keep up with the herd. Doing it by hand costs hours of labor every single day. A tub grinder is the machine most dairy and beef operations turn to once that bottleneck gets too expensive to ignore — here's exactly what it does, who it's built for, and what to check before you buy one.
A tub grinder is a farm machine that shreds bales, loose straw, and crop residue into small, consistent particles using a rotating tub and a high-speed hammer mill. Farms use it to prepare livestock feed rations, bedding material, and mulch in a fraction of the time manual processing takes.
How Does a Tub Grinder Work?
The design looks simple, and that's the point — fewer moving steps means less that can go wrong on a busy farm.
Load
Round bales, square bales, or loose straw go straight into the wide, low tub with a loader or tractor bucket — no untying twine or unrolling by hand.
Rotate & Feed
The tub itself slowly rotates, steadily pushing material toward the center where it drops down into the grinding chamber at a controlled, even rate.
Grind & Discharge
A hammer mill — driven by a 90–132 kW motor depending on the model — shreds the material into uniform particles and discharges it onto the ground, a wagon, or a feed truck.
What Can a Tub Grinder Process?
Straw & Crop Stover
Chop wheat, rice, or corn straw into a soft, digestible feed ingredient or highly absorbent bedding.
Round & Square Bales
Process dense hay or straw bales directly, no manual netwrap or twine removal required before loading.
Corn Stalks & Field Residue
Turn leftover stalks into usable roughage instead of burning or leaving it to rot in the field.
Bedding Material
Produce soft, uniform bedding for free stalls, calf pens, and poultry housing in a single pass.
Key Benefits for Livestock Farms
- ✓Saves labor — one operator can process in an hour what would otherwise take a crew most of a day.
- ✓Improves feed consistency — uniform particle size means better intake and less sorting behavior in the bunk.
- ✓Reduces waste — grinding recovers usable roughage from stalks and lower-grade hay that would otherwise be discarded.
- ✓Speeds up bedding prep — fluffy, absorbent bedding ready in minutes, helping stalls stay drier and cows healthier.
- ✓Handles tough material — heavy-duty hammers and a high-torque motor chew through dense, weathered bales that smaller choppers stall on.
Who Should Buy a Tub Grinder?
A tub grinder pays for itself fastest on operations that process bales or straw on a recurring basis. Here's how to tell if that's you.
Dairy Farms (50–300+ Head)
Need daily, consistent straw prep for bedding and TMR-ready roughage. A mid-power model comfortably covers daily volume without running all day.
Beef Cattle & Feedlot Operations
Process large volumes of hay or straw through winter feeding season. Higher-capacity models keep pace with big herds and long, demanding runs.
Custom Feed & Hay Processors
Grinding for multiple client farms means throughput and uptime matter most — look for higher motor power and a hammer count built for continuous duty.
Mixed Crop-Livestock Farms
Generating your own straw or cornstalk residue? A tub grinder turns what's normally burned or wasted into feed or bedding on-site.
How to Choose the Right Tub Grinder — Buying Tips
1. Match motor power to your bale size and daily volume
Farms handling daily bedding and moderate feed prep usually do well with a 90 kW unit. Operations processing large volumes weekly, or dense, weathered bales, benefit from 130 kW+ for consistent throughput.
2. Check hammer count and wear parts
More hammers (for example, 64 versus 48) means a finer, more consistent grind and spreads wear across more parts — extending the time between hammer replacements.
3. Confirm the power source fits your site
Electric tub grinders are quieter, cheaper to run, and simpler to maintain than diesel or PTO-driven units, provided you have three-phase power available where you'll operate it.
4. Ask about after-sales support
Heavy machinery needs a supplier that ships spare parts quickly and can talk you through issues remotely. Confirm warranty length, response time, and whether on-site installation is included.
5. Buy for where you're headed, not just where you are
Sizing up one motor class now can be cheaper than replacing an undersized machine in two or three years as the herd or client list grows.
Herdmech Tub Grinder Lineup
Both models share the same rotary-tub, hammer-mill design — the difference is scale. Here's how to tell which one fits your operation.
S800-90 Tub Grinder
| Motor Power | 90 kW |
| Hammers | 48 pcs |
| Power Type | Electric |
| Application | Livestock Forage & Feed Processing |
S1030-132 Tub Grinder
| Motor Power | 132 kW |
| Hammers | 64 pcs |
| Power Type | Electric |
| Application | Large-Scale Livestock & Bale Processing |
*Base factory pricing shown for reference; final quotes depend on configuration and shipping destination — contact us for a current quote.
Why Farms Choose Herdmech
Global warranty on every machine
Worldwide shipping, customs included
Farms served across multiple countries
Engineer-supported installation
Frequently Asked Questions
What's the difference between a tub grinder and a bale processor?
Both break down bales for feed or bedding, but a tub grinder uses a rotating tub and a hammer mill for a finer, more consistent grind, while some bale processors rely on tine or roller systems. The S1030-132 is purpose-built for heavy bale processing at large-scale operations.
How much does a tub grinder cost?
Pricing scales with motor power and capacity. Herdmech's compact 90 kW model starts around $21,600 USD, and the heavy-duty 132 kW model starts around $34,110 USD, before shipping or custom configuration.
Can a tub grinder run on electric power only?
Yes. Herdmech tub grinders use industrial electric motors (90–132 kW) instead of diesel or PTO drive, which lowers running costs and simplifies maintenance for farms with three-phase power access.
What size farm actually needs a tub grinder?
Any operation processing bales or straw regularly benefits, but the payoff is clearest for dairy and beef farms with 50+ head, or custom feed operators serving multiple clients — the exact cases where manual bale breaking eats hours of labor every day.
Ready to Speed Up Your Feed & Bedding Prep?
Tell us your herd size and how you process straw or bales today, and we'll help you find the right tub grinder for your operation.