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2026-09-05
Power returns, blade still hot. Wait before a precision rip.
By Mr Retief Nieuwoudt, Kerf notes editor
This kerf note was written for the awkward minute after supply returns and the saw can run again, while the blade is still carrying heat from the last cut. A hot plate grows slightly, resin can soften on the teeth, and the first precision rip after an outage is often the one that wanders. In Johannesburg dry dust and on the coast with damp sheet stock, that temperature jump shows up differently, so the pause and re-check matter.
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.
Restart checks need less time than remaking a cabinet side. Touch nothing until rotation has fully stopped, then check blade temperature, resin on the plate, and whether the fence moved during the outage. If the saw stood near open doors, add a quick dust wipe before the next cut.
Use the blade path with the exact disc on the arbor, then compare the stock against the material path before cutting again. A hot blade behaves differently in chipboard than in hardwood, especially when the outage hit mid-run. If you send a question through our contact form, name this kerf note and the stock thickness so the advice matches the restart problem.
Johannesburg dust sticks fast to a warm plate and can change the feel of a precision rip. Durban moisture can make sheet goods pick up slight movement while the power is off, so the same fence setting may not track the same way after lunch. In Cape Town winter weather, resin build-up often shows sooner on pine and shutter ply after repeated stop-start cutting.
If your offcut shows burn marks, closed kerf, or feathering on one face, keep that sample with the saw record and compare it against other Kerfs. The useful clue is what happened after the outage, not just the tooth count on the disc. That makes it easier to separate heat trouble from alignment trouble.
When power returns, raise the blade clear, spin up without stock, and listen for any change in note before feeding material. Make the first cut on scrap from the same board pack, then inspect both faces and the kerf width before committing to finished pieces. In Kya Sands and Pinetown shops alike, that single test cut often saves a stack of doors or drawer parts.
On coastal stock, check for slight swelling at the sheet edge before blaming the blade for a tight cut. On Highveld jobs, inspect the gullets for packed dust if the saw stopped while chewing through MDF or OSB. If the timber smells hot after a short pass, pause and let the disc lose more temperature.
When using our contact form, include the city, material, blade diameter, and whether the cut failed straight after load-shedding. Mention if it was melamine, MDF, pine, or aluminium composite, because the restart symptoms differ. That gives enough detail to point you to the right blade path and the next check on the machine.
Do not swap to another disc before checking the simple causes. Resin on the body, a shifted fence, a packed insert, or a warm reducer can all mimic a blunt blade after an outage. If the stock type changes later in the day, treat that as a fresh setup instead of carrying over the morning judgement.
Our contact form for blade restart queries, Kya Sands, Johannesburg
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