October 18, 2026

Granberg Alaskan Mill Guide: Sizes, Saw Requirements and Slabbing Tips

A granberg alaskan mill turns a chainsaw you already own into a portable sawmill that clamps to the bar, rides a guide, and slices logs lengthwise into slabs, beams and boards where the tree fell. It is the lowest-cost route into milling, and the most misunderstood: buy the wrong size, pair it with an underpowered saw, or skip the first-cut setup, and the same mill that produces furniture-grade slabs will produce wavy, tapered frustration. This guide covers the current Granberg range, the saw each size actually needs, and the slabbing technique that separates clean work from scrap.

Start by browsing the tools and accessories listings on Lumber Lookup, where chainsaw mills, bars, ripping chain and sharpeners trade together — the mill is only one part of a working setup.

Choosing a Granberg Alaskan Mill Size

Granberg's flagship is the Alaskan MKIV. Per Granberg's own guide to the MKIV, the range runs from a 24-inch model up to an 84-inch model, with 36, 48, 56, 60, 72 and 84-inch sizes for larger work. The size number is the bar length the mill accommodates, not the width of slab you will get: clamps and the powerhead eat several inches, so a 36-inch mill on a 36-inch bar cuts a slab noticeably narrower than 36 inches. Granberg lists adjustable cuts from 1/4 inch to 13 inches thick across the MKIV, and construction is aircraft-grade aluminium with zinc-plated steel.

At the small end sits the Alaskan Small Log Mill, model G777. Retailer documentation for the G777 homeowner bundle describes a mill for 16 to 20-inch bars that cuts slabs up to 18 inches wide, aimed at homeowners and woodworkers milling smaller logs. It is a different, lighter tool from the MKIV, not a small MKIV, and it suits fence posts, small beams and craft timber rather than wide live-edge slabs.

Size the mill to the largest log you will cut regularly, not the largest you can imagine. A 24-inch MKIV handles most yard and woodlot trees. A 36-inch is the working sweet spot for slab furniture stock. The 48-inch and larger sizes exist for genuinely big hardwoods — and they demand the big saws covered next, plus a second pair of hands.

Granberg Alaskan Mill Saw Requirements

The saw is the engine of this mill, and Granberg is explicit that milling is not firewood cutting: the saw runs at full load for minutes at a time, not seconds. Granberg's chainsaw guide for Alaskan mills breaks the pairing down by log size — 50cc to 70cc saws for logs up to 20 inches, 70cc to 90cc for 20 to 30-inch logs, and 90cc or more for logs over 30 inches. The same guide notes the MKIV range accommodates bars from 20 inches to 84 inches depending on size, and that Granberg recommends at least a 50cc engine even for the smaller models.

Apply those bands honestly:

G777 small log mill: a 50cc-class saw minimum, with a solid steel bar — laminated bars are not suitable, per the bundle documentation.
24-inch MKIV: 60cc to 70cc is the comfortable working range; a 50cc saw will cut softwood but will labour in hardwood.
36-inch MKIV: 70cc and up, with 90cc preferred for wide hardwood slabbing.
48-inch and larger: 90cc-plus professional powerheads only — this is the territory of the big Stihl and Husqvarna saws compared in our companion guide.

Two supporting parts matter as much as displacement. Fit a proper ripping chain — Granberg stresses that standard crosscut chain is the wrong tool, because ripping chain is ground for cutting along the grain, runs smoother and loads the engine less. And plan for oiling: long bars in long cuts need more oil than the saw's standard pump setting delivers, which is why auxiliary oilers are a standard Granberg accessory for the bigger mills.

Setting Up the First Cut

Every slab after the first references the first, so a bad opening cut propagates through the whole log. Granberg's system for solving it is a rail guide — its EZ Rail system, or slabbing rail brackets carrying straight 2x4s — fixed level along the top of the log. The mill rides the rail for the first pass, taking off the rounded top and leaving a flat face. From there, the mill's own frame references that flat face for each subsequent slab, and thickness is set on the mill's adjustable posts.

Before that first pass: secure the log so it cannot roll, check the mill clamps are tight on the bar without pinching the chain, set chain tension, fill both tanks, and sharpen. Milling with a dull ripping chain is the single most common cause of slow, wavy cuts blamed on the mill itself.

Slabbing Tips That Actually Help

Keep the feed steady and let the chain work. Forcing a chainsaw mill overloads the engine, heats the bar and waves the cut. A steady, moderate push — or a winch accessory on big logs, which Granberg offers for exactly this purpose — holds a more consistent line.

Wedge behind the cut. Drive wedges into the kerf as you advance on long or stressed logs. A log that closes on the bar mid-cut will stall the saw and can spring the slab; wedges keep the kerf open and the slab supported.

Rest the saw and watch the oil. Check bar oil at every fuel stop at minimum, clean the air filter more often than you would for felling — milling makes fine dust continuously — and give both saw and operator regular breaks on long hardwood cuts.

Mill where the log lies, stack where it will dry. The Alaskan's whole advantage is portability: slab in place, then carry boards, not logs, to the stack. Sticker the slabs immediately so air moves between them from day one.

Measure thickness off the flat face, not the bark. Once the first rail-guided cut has made a true face, every later thickness setting should reference that face. Measuring from an uneven bark side compounds the error slab by slab, and the bottom board of the log ends up thinner than planned. Check the first slab at both ends with a tape before continuing — a two-minute check that tells you whether the mill posts are set square and whether the log has shifted in its supports. If the ends disagree, fix the setup now, not after the log is sawn into tapered stock that no planer pass will rescue cheaply.

For a wider look at the category before you commit, read our roundup of the best chainsaw mills and the full chainsaw mill guide, which cover rail mills, mini mills and the bandsaw alternative.

Conclusion

The right granberg alaskan mill is a system decision: MKIV size matched to your logs, a saw with the displacement Granberg specifies for that size — 50cc at the floor, 90cc-plus for the big mills — a ripping chain, a rail-guided first cut, and wedges and oil discipline after that. Get the pairing right and a granberg alaskan mill produces slabs and beams for a fraction of a bandsaw mill's cost. Ready to build your setup? Browse chainsaw mills and milling accessories on LumberLookup.com and compare what is listed today.