Using Routings to Calculate Mfg Lead Times

In a previous post, we discussed how to enter manufacturing lead times in Item Resource Planning manually. Great Plains Manufacturing will calculate the manufacturing lead times for you from the routings you create to manufacture your items. GP Mfg provides a utility that will calculate the manufacturing lead times based on entries you make in your routings.

As we discussed earlier, there are two types of manufacturing lead times, Mfg Fixed Lead Time and Mfg Variable Lead Time. The entries made in Routing Sequence Entry dictate how these lead times are calculated. The Mfg Fixed Lead Time in Item Resource Planning is determined by the entries made in the Setup Time and the Queue Time on the right hand side of the Routing Sequence Entry window. The Mfg Variable Lead Time in Item Resource Planning is determined by the entry made in the Move Time and the Cycle Time in the Routing Sequence Entry window (see the example below).

The entries made in Routing Sequence Entry are made in hours or fractions of hours. Don’t get confused with the entries made in Item Resource Planning that are made in hours. When you run the Calculate Mfg Lead Times utility, it will convert the hours entered in Routing Sequence Entry to days and display them in Item Resource Planning.

Repeat entering times for each sequence in your routing and the Calculate Mfg Lead Times utility will include entries made in all of your sequences.

Once you have made your entries in Routing Sequence Entry, you will need to run the Calculate Manufacturing Lead Times utility to convert the hours to days and display them in Item Resource Planning. You can run the utility for all items in your item master or just for one item. Click Calculate All for run for all items. To run for one item, enter the item number and click Calculate One.

After running the utility, go to Item Resource Planning. You will see that the Default Values have not been updated, but the sites assigned to the item now reflect the new values calculated by the utility. Also, be aware that running the utility will overwrite and values manually entered in the Item Resource Planning item-site combinations.

You will be able to see all the lead times for an item by doing an inquiry in manufacturing under routings as in the example below.
I would suggest trying this for one item at a time until you get familiar with how Great Plains calculates lead times and you get the results you are expecting.

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