Roller-chain drive prompts can organize horsepower, speed, sprocket, chain-length, pull, and lubrication questions, but they cannot accept a chain product or machine installation. A local screen only knows the entered horsepower, RPM, teeth, center distance, service row, driver row, and strand row.
This guide documents the source boundaries around the ToolGrit roller-chain screen. It points to ASME B29.1, ISO 606, manufacturer selection guidance, OSHA machine-guarding context, and NIST unit references without turning those sources into a catalog selection, guard design, LOTO procedure, or OEM instruction.
What the App Screens
The app computes design HP from entered horsepower and a local service-factor row, then compares that value against local HP capacity rows. It also reports a driven-sprocket prompt, even-pitch chain length, center-distance prompt, chain speed, pull, and lubrication speed-band prompt.
Those rows are local source-gap data. ASME and ISO standards provide chain and sprocket context, and manufacturer catalogs provide application-specific rating and selection data. The app does not reproduce protected standard tables or current manufacturer catalog/software output.
Use the output to identify unresolved assumptions: exact chain series, sprocket set, shaft spacing, take-up, alignment, lubrication, environment, load shock, starts/stops, and OEM limits.
Roller Chain Selection Calculator
Select ANSI roller chain size based on horsepower, speed, and sprocket teeth. Service factor adjustment with chain pitch and strand recommendations.
Sprocket and Geometry Gaps
Speed ratio prompts depend on the entered driver and driven RPM. The app reports a rounded driven-sprocket tooth prompt, but it does not verify sprocket tooth profile, bore, key, hub, hardness, wear, runout, chain wrap, or product compatibility.
The chain-length prompt uses a two-sprocket equation and rounds to an even number of pitches. It does not verify take-up range, sag, tensioning method, shaft adjustment, idlers, guarding envelope, installation clearance, or maintenance access.
Center-distance and small-sprocket warnings are review prompts. Current manufacturer data and OEM instructions control the actual design.
Lubrication and Safety Gaps
The lubrication output is a local speed-band prompt. It does not select an oil, feeder, bath depth, enclosure, maintenance interval, food-grade product, washdown strategy, corrosion protection, temperature allowance, or contamination control.
OSHA 1910.219 and related machine-safety rules are separate from chain sizing. Guarding, exposed nip points, oiling access, LOTO, restart hazards, inspection access, and maintenance procedures need employer and qualified safety review.
A chain-drive report is best used as a checklist of open questions. It is not proof that the machine is ready to run.