The motor is the single most important part of your ChalkBlaster. It's also the part that nearly sank the whole product. If you want a tool that fires chalk off a hold for years without quitting on you, the motor has to be right — and getting there meant watching one tear itself apart on the bench first.
The day a motor came apart in our hands
A motor rated at 150,000 RPM failed mid-run. It threw three of its blades, shredded the circuit board, and severed the wiring inside the housing. The only reason it didn't turn into shrapnel was the solid aluminium casing holding everything together. That casing isn't there for looks. It's there because we watched it earn its place.
A blowout like that is rare, but rare isn't good enough for something you hold inches from your face on the wall. One bad unit is one too many.
150,000 RPM
the speed at which a stock motor shed its blades on our test bench
The real problem wasn't the motor. It was the supplier.
When we dug in, the failure traced back to who we were buying from. Motors showed up spinning at a different RPM than we ordered. The maximum power didn't match the spec sheet. And roughly one unit in a hundred was bad enough to destroy the product it was dropped into. You can't build something climbers trust on parts that change behaviour batch to batch.
So we tested every motor we could get our hands on, put them on the same bench, and compared them against each other instead of against a brochure.
A cheap off-the-shelf supplier
Lowest price up front. Specs that drift from the documentation, RPM that varies between batches, and the odd unit that takes the whole product down with it. You find out what's wrong after it's in a customer's hand.
A partner who builds for the job
Makes similar products, so they'd already hit the same failures we did. They built us a custom motor to spec because they understood what actually breaks and why. Costs more. Behaves the same way every single time.
How we picked the motor that's in your ChalkBlaster
The winner wasn't the cheapest quote. It was a manufacturer who builds products like ours and had already lived through the exact problems we were fighting. They didn't sell us a catalogue part. They built a custom motor around what the ChalkBlaster actually needs, because they'd solved it for themselves first.
That's the lesson we keep relearning in hardware: the most reliable partner isn't always the cheapest supplier — it's the one who understands what you're actually trying to build.
What this means for your ChalkBlaster
The motor in the ChalkBlaster you'll hold is a known quantity. It hits the RPM on the label, draws the power it's supposed to, and behaves identically from the first unit to the thousandth. It sits inside that solid aluminium casing, so even on a bad day the housing takes the hit, not your hand.
You'll never think about any of this at the crag, and that's the point. The boring reliability is the feature. It's the difference between a gadget and a tool you stop worrying about.
From the comments
A hardware engineer made the point we keep coming back to: judge a supplier on total cost of ownership, not the purchase price — a cheap part that fails in the field is the most expensive one you can buy.
Another builder put it simply: the supplier worth keeping is the one who asks “what actually breaks?” before they quote you.
SWEEP Climbing builds tools for climbers who take friction seriously.
