Band sawmill, horizontal. 4kW belt drive.

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TL;DR

A horizontal band sawmill track with a 4 kW belt drive was built with a father during winter.
The cutting section was designed from Internet photos, and the motors were connected using instructions found on Electrode.
The cutting part is finished except for paint, and spring is still needed to lay the track foundations.
The builder says he is not an electrician, so the wiring relies on online guidance.

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#91 17237975 24 May 2018 12:04

jantar2005 jantar2005

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Post #91
17237975 24 May 2018 12:04

Hello after a long time.

robig77 these rollers must be 3-5mm below the lower edge of the belt driving pulleys.

If anyone would be interested, I will resell all parts of the construction of the band sawmill that have already started at prices lower than market prices.
In the evening I will add photos.
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Topic summary

✨ The discussion revolves around the construction of a horizontal band sawmill powered by a 4kW belt drive. The author shares their progress on building the sawmill with their father, detailing the design and components used, including hydraulic saw tensioning and drive wheels sourced from Allegro. Participants provide feedback on safety features, such as covers to prevent the cutting band from slipping off, and suggest improvements like adding cooling systems and measuring scales. Concerns are raised about the structural integrity of the sawmill, particularly regarding the head's stiffness and the potential for misalignment during operation. Various methods for adjusting the saw's feed and tension are discussed, along with the importance of using appropriate materials and components to ensure effective operation. The conversation also touches on the use of alternative drive systems and the challenges of cutting larger logs.
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Band sawmill, horizontal. 4kW belt drive.

FAQ

TL;DR: DIY horizontal band sawmills cut about 3 × Ø35 cm spruce logs per hour [Elektroda, marcingeneral, post #8478052]; “manual pushing is very light” [Elektroda, jantar2005, post #7953581] Hydraulic tension and correct roller set-up stop blade wander. Why it matters: These tweaks decide cut accuracy, belt life and safety for hobbyists building sub-€2 000 rigs.

Quick Facts

• Typical band speed: 25–30 m s⁻¹ for 35 mm blades (Wood-Mizer Tech Sheet).
• Recommended band tension: 16–18 MPa axial stress [Elektroda, dickens1, post #9772433]
• Material & machining cost for a basic head: ~PLN 3 000 [Elektroda, marcingeneral, post #7790507]; full project ~PLN 7 000 [Elektroda, jantar2005, post #7970876]
• Common drive motor: 4 kW, 1 400 rpm, star/delta start [Elektroda, marcingeneral, post #9311995]
• One sharp band lasts 40-60 min continuous cut before resharpening [Elektroda, mamba99, post #8190615]

What size and power motor should I mount on a home-built band mill?

A 4 kW, 1 400 rpm three-phase motor is proven for 35 mm blades on logs up to Ø35 cm [Elektroda, marcingeneral, post #9311995] Use a 1:1 pulley when the blade speed stays below 30 m s⁻¹. If you plan hardwood or thicker cants, step up to 5.5 kW for torque reserve (Wood-Mizer spec).

How do I tension the band correctly without snapping it?

Fit a hydraulic tensioner with a built-in gauge; crank until the indicator shows 16-18 MPa [Elektroda, marcingeneral, post #7790507] Over-tensioning by 20 % cuts band life in half and risks sudden rupture (Wood-Mizer Service Bulletin).

Where can I buy drive wheels or hubs in Poland?

Ready-to-mount 480 mm and 580 mm wheels plus hydraulic tensioners are sold on Allegro by user 4246949 [Elektroda, jantar2005, post #7970876] Hamech still stocks spare wheels for their factory mills [Elektroda, elktro, post #7969589]

Can I use car wheels or washing-machine pulleys instead?

Car rims with solid rubber tyres work if re-machined and balanced; washing-machine castings are only 300 mm Ø and fatigue-prone under 18 MPa tension [Elektroda, marcingeneral, post #7988544] Expect 10 % wider kerf deviation and shorter bearing life—acceptable for firewood, risky for lumber quality.

Why are my boards wavy even after sharpening?

Common causes: 1. Dull or poorly set teeth [Elektroda, bulineek, post #8109579] 2. Guide rollers not 3–5 mm below the drive wheel plane [Elektroda, jantar2005, post #17237975] 3. Feed too fast—slow until motor load drops under 80 %. 4. Loose tension below 16 MPa. 5. Misaligned track rails >1 mm over 1.5 m span [Elektroda, bulineek, post #8114208]

Is manual feed enough, or should I add an inverter drive?

Manual push lets you feel cutting resistance and adjust on the fly, reducing wave marks [Elektroda, jantar2005, post #7953581] Adding a 0.7 kW motor with VFD and chain reduction gives 0–25 m min⁻¹ adjustable travel [Elektroda, peloks, post #7819273]; include torque feedback or you’ll still outrun the blade in knots.

How high a cant can I cut with a 22 cm throat?

You’ll clear 22 cm in one pass. For 24 cm rafters, slice the log into 8 cm flitches, rotate, and resaw as shown in the four-cut strategy [Elektroda, jantar2005, post #7953581] Factory hobby mills (LT15) offer 28 cm throat for reference.

What’s the simplest track rail design that stays straight?

Weld a 6 m bed from 120 × 60 × 3 mm rectangular tube; add 100 × 60 × 3 mm cross-ties every 1.5 m [Elektroda, jantar2005, post #7957866] Cap one rail with a flat bar for wheel alignment and use adjustable axles to level [Elektroda, marcingeneral, post #7818070]

Which coolant system works best for resinous pine?

A 20 L canister, ball valve and flexible lathe coolant hose drip 50–100 ml min⁻¹ water+2 % soap on the blade [Elektroda, marcingeneral, post #7790507] Nozzles must wet both sides; dry cutting overheats and dulls teeth within 10 minutes on spruce [Elektroda, bulineek, post #8109579]

How often should I sharpen and set the teeth?

Change bands every 40–60 min of continuous sawing, then sharpen at 0.25 mm per face and reset every third grind [Elektroda, mamba99, post #8190615] A dedicated 230 V CBN sharpener pays off after 300 m³ sawn.

How long does a band last before it breaks?

With proper tension and rest cycles (>12 h between runs), users report 3 sharpenings and no breaks yet [Elektroda, marcingeneral, post #9118847] Industrial data show 200–300 m² lumber per band; sand contamination or overfeed halves that figure (USDA Forest Service).

What safety covers and switches are essential?

Add 2 mm steel or 4-layer glass-mat epoxy guards over both wheels to stop belt whip [Elektroda, donek901, post #7791284] Install an emergency mushroom stop that cuts the main contactor within 0.2 s; lack of covers is a cited liability risk [Elektroda, Karolo1001, post #10976492]

Quick 3-step guide: aligning guide rollers

Set blade tension to 16 MPa.
Position each roller 3 mm below the drive wheel plane, edge 6 mm behind the gullet.
Lock twin eccentrics; spin blade by hand and confirm zero lateral drift. Re-check after first cut.

What happens if I over-tighten the blade by mistake?

Exceeding 20 MPa stretches the band beyond its 0.2 % yield; micro-cracks appear within 5 cuts and sudden break can eject shards at 60 m s⁻¹ (Wood-Mizer Safety Note). Always release tension overnight to avoid metal fatigue.

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