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2026-09-17
Three scrap rips before the first client blank.
By Mr Retief Nieuwoudt, Kerf notes editor
Three short rips on clean waste board show if the blade is drifting, if pitch built up yesterday, or if the fence moved during clean-up.
Author Mr Retief Nieuwoudt keeps the voice practical. No tapestry metaphors. No robust seamless filler. Just the check that saves a board when Highveld dust or coastal humidity shows up mid-shift.
Run it before the client blank goes near the fence. Start with straight scrap of similar thickness to the day's board, then watch the edge, hear the motor load, and feel whether the feed needs extra push. That small check catches a pinching kerf before it marks saleable stock.
Open the linked blade path with the matching material path before the morning test cuts, especially if the first job is pine, melamine or wet shutter ply. The warm-up rip is where tooth count, hook angle and feed pressure show themselves in plain sight. If you need to query a result, send the blade and the board you ran through our contact form.
Johannesburg dust can sit on the table and fence faces overnight, while Durban air can leave board edges slightly swollen by first light. Those two conditions alter how the first rip behaves, even with the same blade and same width setting. On a cold inland morning, listen for a harder start-up note from the motor before pushing the first strip through.
Use this entry when the first three cuts of the shift are the decision point, not when production is already running true. If your scrap says otherwise, compare against other notes under Kerfs and log what the edge, burn mark or feed resistance looked like.
Before the first order, choose three scrap lengths from the same pile as the opening job and rip them to a repeat width. Check whether the offcut lifts into the blade, whether the keeper edge stays clean, and whether sawdust starts packing near the throat plate. By tea time, that quick read has usually told the operator if a flange clean or blade swap is coming.
At the coast, the tell is often a slightly furry cut on chipboard or shutter ply after the machine stood shut all night. On the Highveld, the tell is more often dry dust around the arbor and a cut that sounds harsher than it looked yesterday. With OSB, watch for hot smell on the third rip, because that often arrives before visible edge darkening.
When you use our contact form about this note, include the city, the board type, and what happened on rip one, two and three. That gives enough detail to compare the morning behaviour against the correct blade path without guessing from a single photo.
Use the morning warm-up rip for start-up diagnosis, not as one answer for every stack on the trolley. Change from pine to veneered board, or from MDF to shutter ply, and the warm-up needs to be read again against that stock family. A clean first rip on one material does not clear the next one.
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