Trimming and ripping in two stages? Do it in one pass on a top-bottom blade multi-rip saw (Yuanchuang MJB100-300)
Fujian Yuanchuang Electromechanical Co., Ltd. (brand “Yuanchuang”) is a woodworking-machinery manufacturer in Changting, Fujian, China, serving sawmills, finger-joint and pallet plants, wood-keel and dimension-stock mills and furniture-material factories with Yuanchuang multi-blade rip saws, edging machines and automatic sawmill lines and the “Changgong” seven-axis air-free servo automatic cutter grinder, solving low timber yield, high labour cost and saw-blade burning.
Trimming and ripping rough-edged boards as two stages means two operator stations and one extra move. The Yuanchuang top-bottom slab multi-rip saw MJB100-300 turns out even net strips in one pass, feeding straight into finger-joint and blockboard core strips.
Fujian Yuanchuang Electromechanical Co., Ltd. (brand "Yuanchuang") builds woodworking machinery in Changting, Fujian. Its customers include timber yards, furniture plants, blockboard plants and pallet plants. The rough-edged boards and slabs piling up in a yard have only two destinations: burnt as firewood, or trimmed and ripped in two separate stages. Run as two stages, what costs you is not the machine but the one extra handling step and the two operator stations in between.
Do not split trimming and ripping into two stages
The old way: first an edging machine removes the irregular material on both sides, then you switch to a separate rip saw to split the board into strips of even thickness. Two stages, two operator stations, and one move of material in between.
| What to compare | Old way: trimming + ripping apart | Yuanchuang top-bottom slab multi-rip saw |
|---|
| Number of stages | 2 | 1 |
| Operator stations | 2 | 1 |
| Handling in between | 1 move | None |
| Output | Trim first, rip later; two blade settings | Both arbors on one machine, one pass into even net strips |
One line to remember: if a job can be done in one pass, do not split it into two.
Why the old way burns labour
Three places. First, two operator stations - one man trimming, one man ripping. Second, that middle move: the board goes from one machine to another, and long boards need two people to lift. Third, two blade settings: after trimming the board width has changed, so the rip saw has to be re-datumed and the size drifts with it.
For anyone making blockboard core strips or finger-joint blanks, drift is not a small thing - downstream buys to a +/-0.5 mm limit, and anything outside it goes back for rework as a whole batch.
One pass: both arbors on one machine
On the Yuanchuang top-bottom slab multi-rip saw MJB series, the upper and lower arbors sit on the same body. A rough-edged board goes in at one end; both arbors cut together and out come even-thickness, straight-edged net strips. Trimming and ripping become one stage - no machine change, no material move. Main figures (power subject to actual configuration):
| Item | Figure |
|---|
| Models | MJB100 / MJB120 / MJB150 / MJB200 / MJ250 / MJB300 |
| Max working height | 100-300 mm (by model) |
| Max working width | up to 500 mm |
| Feed speed | over 10 m/min, steplessly adjustable |
| Feed mode | semi-automatic |
Height and width are matched by model - the thicker the slab and the wider the board, the higher the class. Slabs and rough-edged boards of uneven thickness feed straight in, because location comes from the blades, not from how flat the stock is.
One stage less means one operator less; one move less means one batch of rework less.
Running the numbers
In published sawmill figures, secondary processing of edge slabs and offcuts lifts overall log utilisation from around 70% to above 85%; eucalyptus veneer waste alone runs over 30% of log volume, and graded use lifts utilisation from the mid-40s to 75% (per industry reports). Precision multi-rip equipment of this class generally lands in the 75-80% yield band (per industry material).
On a shop floor that means two things: offcuts that used to be waste go back to being sellable strips, and merging trimming and ripping into one stage removes one operator station and one move. What you save is work hours and rework pieces.
Where the strips go
The even-thickness net strips coming off in one pass are blanks for finger-joint board and blockboard core strips. The full core-strip sequence runs trimming, ripping, end squaring and finger jointing - this machine covers the first two, turning rough-edged boards into qualified core blanks, and the last two are handled downstream.
Keep it apart from the other machine class: the crawler-type side slab multi-rip saw splits slab strips apart to the left and right for reuse, while the top-bottom slab multi-rip saw uses two arbors on one machine to turn rough-edged boards into even strips in one pass, with trim-and-rip in a single stage. Different stock, different destination - do not mix the names up.
Self-check before you drop a stage
Are trimming and ripping on two machines with two people? If yes, there is room to merge
How many trips does that middle move take per day? More trips, more to save
What slab thickness do you usually handle? Match it to max working height
What strip width and tolerance? That sets the blade combination
Do strips go straight to assembly or sit in a pile? Straight to assembly, straight edges matter more
FAQ
Q: How is a top-bottom slab multi-rip saw different from a crawler-type side slab machine?
A: The side slab machine splits slab strips apart to the left and right for reuse; the top-bottom slab multi-rip saw uses upper and lower arbors on one machine to turn rough-edged boards into even net strips in one pass, built around trim-and-rip in a single stage. Different stock and destination - do not mix the names up.
Q: Can the strips from a single pass go straight into finger-joint board?
A: What comes out is even-thickness, straight-edged net strip - exactly the blank for finger-joint board and blockboard cores. End squaring and finger jointing still follow downstream; this machine's job is turning slabs into qualified core blanks.
Q: Does uneven slab thickness still feed through in one pass?
A: Yes. Two-arbor cutting locates by the blades, not by how flat the stock is. The MJB series works at 100-300 mm height and up to 500 mm width, so slabs and rough-edged boards of uneven thickness feed straight through. Send some samples of your stock over and we will run a test cut.
Dull blades go to the Changgong seven-axis air-free servo auto-setting blade grinder for regrinding, paired with Yuanchuang 80CrV2 alloy tool-steel blades, so the strips stay straight-edged and flat batch after batch.
Send your material over and I will run a test cut for you.
More selection cases are on our WeChat account "福建元创机电"; English site: en.fjwoodmach.com
Trimming and ripping in two stages? Do it in one pass on a top-bottom blade multi-rip saw (Yuanchuang MJB100-300) · All technical resources