Specifying Bore-Dependent Minimum Lengths

Model Reference Manual

The TUBE BORE command allows the user to specify different minimum tube lengths for different ranges of bore diameter. Each range of tube size is specified by a minimum and maximum bore (not necessarily in that order), followed by the minimum tube length allowed for that range.

Up to ten different ranges may be specified. If a tube diameter falls outside any specified range, then the current default length is applied (100 mm, unless this has been overridden by prior use of the TUBE <uval> command).

If two or more ranges overlap, the user is warned but the ranges are not rejected. Tube length checks are applied in the order in which they have been specified. Thus, if the bore of a section of tube lies within more than one specified range, its length will pass or fail the tolerance test determined by the first valid range only.


Example:
TOL TUBE BORE 15 25 MIN 150	All tubes with bores in the range 15-25 mm must be at least 150 mm long
TOL TU BO 25 15 150	The same as the preceding example. The maximum bore is given before the minimum bore and the optional MINIMUM (length) command word has been omitted.
TOL TU BO 2 IN 4 IN MIN 12 IN	All tubes with bores in the range 2-4 inches must be at least 12 inches long
INCH DIST TOL TU BO 2 4 MIN 12	The same as the preceding example, except that the current distance units are now inches
TOL TUBE DEFAULT	Resets minimum length to 100 mm for all bore sizes regardless of any ranges previously defined separately

Complex Example:

The following sequence:

TOL TUBE  500
TOL TUBE  BORE  15  25  MINIMUM  100
TOL TU  BO  25  50  MIN  150  BO  50  100  MIN  300
TOL TU  BO  200  400  750

would cause subsequent checks to report tube lengths less than the permitted minima in the following circumstances:

For bores between 15 mm and 25 mm, if length is <100 mm

•

For bores between 25 mm and 50 mm, if length is <150 mm

•

For bores between 50 mm and 100 mm, if length is <300 mm

•

For bores between 200 mm and 400 mm, if length is <750 mm

•

For all other (unspecified) ranges, if length is <500 mm

The latter case would apply to bores less than 15mm, greater than 400mm, and within the range 100mm to 200mm.

Command Syntax:

                        .------------------------<------------------------.
                       /                                                  |
 >-- TOLerance TUbe --*-- BOre <uval> <uval> --+-- MINimum --.            |
                      |                        |             |            |
                      |                        ‘-------------+-- <uval> --|
                      |                                                   |
                      ‘-- DEfault ----------------------------------------+-->

Querying:

>-- Query TUbe -->

>-- Query TOLerance OPTions -->

(also outputs ATTACHECK and misalignment settings)