Land-clearing debris feed characteristics should be measured before a horizontal grinder is selected. A clearing site may deliver brush, small stems, branches, bark, foliage and soil-bearing roots in one pile, yet those fractions can behave differently at the feed opening and produce different output. A useful engineering brief describes the range of material, the unsuitable fraction and the intended product. This guide provides a field measurement method for buyers and contractors. The exact machine limits and safe operating method must be confirmed with the manufacturer and project team.
Define the source, not just the material label
Record which parts of the site contribute to each load: road corridor, woodland edge, root clearing, storm-damaged trees or general brush. Note collection method, storage time and whether material was dragged across soil. Two loads called land-clearing debris may have very different stone and dirt exposure. Assign a lot number and keep source photos with a scale reference. Do not describe the entire project from one clean sample taken at the top of a pile. The logging slash feed-characteristics guide gives a related method for harvest residue, while clearing work adds mixed origins and potentially more root material.
Measure the largest practical pieces
Record the length, diameter range, fork shape and number of pieces that cannot be gripped or presented by the available loader. Use a sample that includes difficult pieces, not only the easy average. Note whether cutting or sorting is planned before grinding and how much labor it takes. Ask the supplier which dimensions and shapes the proposed feed system can accept for the actual configuration. A nominal opening dimension alone does not show how a curved root or branched top will bridge. Keep excluded pieces in the quantity record so later production figures have a clear denominator.
Separate woody and nonwoody fractions
Estimate the share of stems, limbs, foliage, bark, roots, soil and other waste by a documented sampling method. Record whether grass, leaves, plastic or demolition material is present and decide which fractions must be rejected. Do not assume a wood grinder can process every material collected during clearing. The intended receiver may prohibit certain fractions even if the machine can physically pass them. Mark each lot as accepted, sorted, trial-only or rejected, and keep these decisions visible to the loader operator. A supplier’s equipment recommendation should refer to the material that will actually enter the machine.
Record moisture and weather exposure
Fresh cut stems, wet foliage and weathered brush may feed and screen differently. Document collection date, rainfall exposure, storage conditions and the moisture basis used in any weighing or laboratory result. Appearance alone is not a reliable moisture measurement. If the output buyer pays by mass, dry matter or energy, ask for its accepted sampling method. Keep wet and dry trial lots separate until their effect on loading, output quality and accepted yield is known. Avoid applying a rate achieved on dry branches to a muddy mixed pile without a representative test.
Identify contamination before testing
Walk the pile for wire, metal, stones, soil-bearing roots, fasteners and unknown objects. Keep a distinct reject area and record how much material is removed. Detection devices, if fitted, do not replace source inspection. Assign who makes the stop decision when a suspect piece appears. The safe-feeding checklist for logging slash explains the need for guarded operation and formal clearing procedures; the project must follow its machine manual and local safety plan. Never push a suspect object into the grinder merely to see if the equipment can handle it.
Describe loader presentation and pile geometry
Record the loader type, attachment, travel path and how an operator grips long or tangled material. A pile of brush may require repeated separation before a feedable pick is available. Time several representative cycles, including one rejected piece and one difficult top. Note whether the same loader must remove output. The material description should include this handling work because a grinder cannot produce at a brochure rate while waiting for a shared loader. If pre-cutting is required, state its equipment, staff, time and site location rather than treating it as free preparation.
Set the output rule before choosing a screen
Ask the receiving operation for written particle size, fines, oversize, moisture and contamination limits, plus sampling and weighing rules. Different outlets may need different preparation. Record whether bark and foliage are acceptable and what happens to rejected output. The logging slash throughput protocol shows how screen choice and feed description belong together. Do not select a screen opening solely from an internet example; the manufacturer must confirm the configuration, and a representative run must test the resulting product.
Run a trial across the full range
Prepare easy, typical and difficult lots with identifiers. Record eligible input, excluded material, pre-cutting, loader cycle, feed-on time, stops, accepted output and regrind. Note machine configuration and operator conditions. Observe the whole line, including discharge trucks, so a full output bay is not mistaken for a feed limitation. If a setting or screen changes, keep the material and acceptance rule as comparable as practical. A trial cannot prove a fixed long-term rate, but it can expose questions for supplier review and provide a defensible basis for the first planning estimate.
Keep a compact sampling sheet for each lot. Include source area, collection method, observed components, a photograph of the largest piece, estimated or weighed quantity, excluded fraction, moisture method and the person who inspected it. Record the output sample label beside the corresponding input lot. If several lots are blended, note the proportions and the reason. A neat average without its source range can mislead a buyer: it hides the small set of difficult pieces that may control loader time and safe feed presentation.
Review uncertainty explicitly. Where the pile interior cannot be inspected, state that limitation and set a hold or additional-sampling decision. Where no receiving specification exists, obtain one before treating any ground output as saleable. Where the loader is not yet selected, time an equivalent handling trial only as a provisional estimate. The selection brief should distinguish observations from assumptions so the supplier can identify what still needs testing.
Turn observations into a selection brief
Summarize material range, maximum practical dimensions, contamination exclusions, moisture samples, loader method, outlet specification and site constraints. List uncertainties that need another sample. Ask the supplier to identify which proposed machine, feed controls, screen and support equipment match that brief, and which material it will not accept. The horizontal grinder product range provides equipment context. A horizontal wood grinder overview can orient a procurement colleague. Submit the lot record through the engineering contact page for a model-specific review.
