Impala Pitch¶

Impala Headrail System

Impala is a headrail system supplied by a company called Eclipse.
It has a complicated method of calculating the travellers for the headrail If an Impala headrail is used, we can now print the travellers on the report ‘Works Order Label Blind Size’ and on ‘Works Order Portrait’.

We have also enabled this for another headrail system called Vitesse.

This means Blindata can now work with four different headrail systems, Impala 89mm, Impala 127mm, Vitesse 89mm and Vitesse 127mm.
We have created a table in Administration > System Tables to handle these.

We now hold these headrail systems in the ‘Headrail Slat Table’ in Administration > Parameters.

There is one further complication. The pitch figure is based on the following calculation (taken from page 54 in the Impala manual):

We, therefore, have another table that will hold the pitch calculation, based on blind type, two options (draw, controls), slat table (vane width), drop and a formula.
This table is called ‘Impala Pitch’ and is held in Administration > System Tables.
The user can enter the fields in a form (see below).
The pitch will be calculated from this, and it is this pitch that is used when looking up the Impala traveller table.

The Impala traveller table is held in a spreadsheet, Impala_trav_look.xls. Column A contains the pitch width, column B-E contain the number of travellers and the traveller code.
For example, if the pitch width was 777, this information would be found:

778 4 3C 7 3D

This means that the number of vanes is 11, 4 of which use traveller code 3C, 7 of which use 3D. We want to display this on the works order label as No. of Vanes: 11 (4 3C, 7 3D).

Once the information is found, it will print on a works order report.
To start with, it has been put on ‘Works Order Portrait’ and ‘Works Order Label Blind Size’.

It is now possible to hold the Impala and Vitesse Traveller tables in the system.
They can be imported in* Administration > Import from Excel in new import options called Impala 89mm, Impala 127mm, Vitesse 89mm and Vitesse 127mm.*