Ottoref — Standards MCP Server

Return the resulting fit between one hole class and one shaft class at the same nominal size, such as 12 H7/h6: the type (clearance, transition or interference), the minimum and maximum clearance, and the maximum interference. Values are millimetres. A negative minimum clearance means the fit can interfere. This reports the geometry of the fit, not whether it is the right choice for a joint, which depends on function and is the caller's decision.

Return the deviation that a general-tolerance note such as ISO 2768-m implies for one dimension, so an unmarked dimension can be checked. The tables differ by what they cover: linear dimensions, broken edges (external radii and chamfer heights), and angular dimensions, which are keyed by the shorter side of the angle rather than the nominal size. A general tolerance applies only where the drawing gives no individual tolerance, so check for one first.

Compare a stated deviation numerically against the ISO 2768-1 general-tolerance value for one dimension. This is only a numeric comparison: first establish that the dimension has no individual tolerance indication, because the general tolerance applies only to unmarked dimensions. The result does not establish process capability.

List the exact nominal-size intervals where one ISO 286 tolerance class is supported, such as H7, j5 or N9. Use this before relying on a class across a size range; omitted intervals are not inferred.

Return the standard tolerance value for one IT grade at one nominal size, in micrometres and millimetres, with the size step it came from. Use this when a drawing or a calculation needs the tolerance width itself, rather than the limits of a specific class.

Return the upper and lower deviations, and the resulting limits, for one tolerance class at one nominal size, such as 36H7 or 36g6. Uppercase is a hole, lowercase a shaft. Values are millimetres and are deviations from the nominal size. Use this to interpret a toleranced dimension; whether the resulting limits suit a joint is an engineering decision.

List the standards this server implements, and what within each one is not covered. Call this first when a question mentions a standard, so you know whether the value you need is available before you promise an answer. Coverage is partial by design: unimplemented values are refused with a stated reason rather than approximated. Use iso286_applicability for exact size intervals of an ISO 286 class.

List what the material reference holds and what it does not. Call this when a material was not found, or before promising a property, so a gap is visible rather than assumed. The reference is limited to typical values for common metals and plastics: it holds no design allowables, no fatigue data and no high-temperature data.

Look up indicative material properties for a common metal or plastic by designation, such as 6061-T6, 304 or Ti-6Al-4V. Returns density, yield and ultimate strength, Young's modulus, Poisson's ratio, elongation, thermal expansion and maximum service temperature, all in SI. These are TYPICAL handbook values, not design allowables: every value is tagged basis: typical. Use them to compare materials, estimate mass, or supply an indicative modulus to an analysis; obtain an allowable from a qualified source before relying on a strength margin. An unmatched designation means this reference does not hold it, not that the material does not exist.

Compare one measured feature against a manufacturing process's limits and report whether it is within, marginal, or beyond them. Some limits are expressed as a ratio of material thickness rather than an absolute size — a 1 mm hole is fine in thin sheet and difficult in thick plate — so supply the thickness when the limit needs it. A result inside the limits is not a promise that a shop can make the part, or an estimate of what it costs. Pair this with a measured wall or hole size from a CAD server to answer whether a part suits a process.

Describe what a manufacturing process can hold: minimum wall thickness, minimum hole-to-edge and hole-to-bend distances, minimum internal corner radius, bend radius, draft angle, pocket depth-to-width ratio. Call process_feasibility to test one measured feature against these. These are published rules of thumb for geometric feasibility, not a specific shop's capability, and they say nothing about cost or lead time.

List the manufacturing processes this server has limits for, and which features each one covers. Call this first when a question names a process, so an unsupported process is visible before a check fails.