Talk to a human
Questions about a belt calculation, a cross-section dimension that looks off, an idea for the next tool — this page reaches the person who maintains the calculator, and every message gets a reply. Prefer email? Write directly to hello@BeltCalculator.com.
1 · Pick what this is about
Choosing a topic pre-fills guidance below and routes your message. Pick the closest match — "Something else" is a real option.
2 · Write the message
Typical reply times
Bug reports Reproducible bugs get fixed faster than we reply about them. | 1–2 business days |
Formula/data corrections Verified corrections usually ship the same week they arrive. | 2–3 business days |
General questions & feedback Every message gets a reply, even the short ones. | 2–3 business days |
Partnership & press A slightly slower inbox, the same human reading it. | 3–5 business days |
What happens after you write
No black-hole inboxes: here is the loop a message goes through, whether it is a correction to a datum dimension or a complaint that a result confused you.
- 1
You write, we read
Every message lands in a real inbox and gets read by the person maintaining the calculator — not a ticket queue that closes on silence.
- 2
We verify against sources
Pricing corrections get checked against the survey or rate sheet you cite; bugs get reproduced with your exact inputs before anything is called fixed.
- 3
The site changes
Accepted corrections ship to the estimator within the week. Everything else is answered directly, even when the answer is 'we won't build that.'
Quick answers, no form required
Most questions about the belt calculator and this site fall into one of these six. If yours isn't here, that's what the form is for.
Q1
Is the calculator really free?
Yes — every tool on the site is free with no account. No email wall, no trial, no project profile to maintain.
Q2
Which belt should I buy for my calculated length?
The calculator maps V-belt results to the nearest stock designation (A42, 3V500, SPZ 1250…) and prints the delta versus your exact figure. Slightly long tensions fine; slightly short must be forced — when in doubt, confirm the designation with your belt supplier.
Q3
Why does my result differ from another website's calculator?
Many tools use the shortcut (π/2)(D₁+D₂) approximation or ignore belt thickness entirely. This engine uses exact tangent-line geometry, applies V-belt datum offsets, and solves the center distance in closed form. On everyday drives the difference is small; on tight centers and large ratios it is not.
Q4
Can you add a new cross-section or pitch profile?
Quite possibly — send the profile, the datum dimensions (top width, thickness, pitch-line offset) or pitch, and a source (a manufacturer datasheet is ideal). Requests with sources go straight onto the roadmap.
Q5
Do you sell belts or take affiliate commissions?
No. No affiliate links inside results, no sponsored presets, no supplier lead sales. Advertising may appear on the site, but it never influences calculator behavior. Trust is the whole business model.
Q6
Can I use your figures in my own blog or course?
Generally yes for personal, non-commercial teaching use with attribution — just ask via the form so we can confirm the material.