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Microbore lead routing and length planner
Microbore is what makes a diagnostic lead readable, because very little fluid has to move before the gauge settles. Bend radius is what you pay for it. Going tighter than the bore allows flattens the tube and puts the reinforcement on the outside of the bend into permanent tension, which is where microbore hose usually fails first.
Will the route work
How long the lead has to be
Order by the dimension between the connection faces rather than by raw hose length, because that is the dimension that decides whether the lead actually reaches. Each 90 degree corner adds length: the hose travels a quarter circle rather than a square corner.
Published figures for the two bores
| Bore | Inside diameter | Outside diameter | Minimum bend radius |
|---|---|---|---|
| DN2 | 2 mm (0.079 in) | 5 mm (0.197 in) | 20 mm (0.79 in) |
| DN4 | 4 mm (0.157 in) | 8 mm (0.315 in) | 40 mm (1.57 in) |
The length estimate models each 90 degree corner as a quarter circle of the radius you enter, added to the straight face-to-face distance. It is a planning figure for a route you have measured, not a substitute for the assembly drawing. If the route on your machine is tighter than the bore allows, the answer is normally a longer lead or an angled end rather than a smaller radius.
