Ask any supplier on a spinning floor how quickly their system pays for itself and you will get a number. It will be a good number. It will be printed on something.
We have that number too. Our own workbooks produce it, and on a high-volume open-end shed it is genuinely attractive. We do not publish it, and this note is about why.
The number is real. It is just not yours.
Payback on a spinning floor is not a property of the equipment. It is a property of the mill. The same installation, unchanged, produces wildly different answers depending on four things:
- What count you spin. A coarse shed wins on volume; a fine shed wins on value per kilogram. Both work, and they work by completely different arithmetic.
- How much you actually produce. Recovery is a percentage of throughput, so throughput sets the size of the prize.
- What your yarn is worth. Two mills running the same count can be a hundred rupees a kilogram apart.
- How you run your shifts. Working days a year moves the answer more than most people expect.
Between a high-volume coarse shed and a premium fine-count shed, the honest payback range on the same product spans years. A single published figure would be accurate for one of those mills and misleading for the other — and the mill it misleads is the one that finds out after signing.
A poster number is a number you have to defend
There is a practical problem with printing a figure, separate from the honesty of it. A number on a wall gets photographed. It gets quoted back at you eighteen months later by someone whose floor does not match the profile it was calculated for. And the conversation you then have is not about their floor — it is about whether you were straight with them.
A claim a customer can disprove is worse than no claim at all.
We would rather have no number on the wall and a defensible one in the room.
So we published the model instead
The calculator on this site takes six inputs about your floor and returns a range, not a point estimate — because a single number invites an argument that cannot be won from a web page. Every assumption sits on screen next to the answer, including the unflattering ones: production-rate gain is set to zero, because we do not assume monitoring makes a machine run faster.
It uses the conservative and moderate columns of our workbooks. There is an aggressive column. It is not on this website.
And the model is still not the answer
A calculator is a better artefact than a poster, and it is still a model. It knows six things about your mill. Your mill has ten thousand.
The version that matters is measured: a baseline taken by your own people before anything is installed, a comparison taken the same way afterwards, and a conversation about the places where the difference was smaller than anyone expected. That baseline is yours to keep whether or not you buy anything.
It is a slower way to sell. It is the only way we know that survives the second year.