Friday, April 22, 2011


A co-worker who uses Autocad LT to do his electrical drawings recently said he could not open one of my drawings, because I had saved it as R2010. I had recently been upgraded from Autocad R2008 to R2010, so I said:

"I believe you may be able to upgrade to the R2010 version".

Which he did, which in hindsight was not the best plan, as after installing he wanted to use the hatch command, and got a dialog saying:

"Cannot find acadlt.pat"

Which is fine: All you have to do is go Options, File Locations, and add where it is to your support path. Unfortunately, on the network, we are mere users and are not allowed access to our c: drive.

The IT man was duly called, and progress is on going...involving reimaging and so on.

Which made me think, why can you not get a copy off the internet, download it, stick it somewhere where you are allowed to go and add that location to your support listing?

Strangely enough, I was not able to find a copy of acad.pat anywhere!

Of course there were heaps of people giving out add-ons to the file, but not the file itself.

So here I am, Saturday morning of the 23rd of April, rummaging around my hard drive for the mysterious file. (Mad? Yes!). You can open it up in Notepad and check it out.

Here is part of it:

;; Copyright (C) 1991-2011 by Autodesk, Inc. All Rights Reserved.
;; Version 2.0
;; AutoCAD Hatch Patterns
;; Note: in order to ease migration of this file when upgrading
;; to a future version of AutoCAD, it is recommended that you add
;; your customizations to the User Defined Hatch Patterns section at the
;; end of this file.

;; Note: Dummy pattern description used for 'Solid fill'.
*SOLID, Solid fill
45, 0,0, 0,.125
*ANGLE, Angle steel
0, 0,0, 0,.275, .2,-.075
90, 0,0, 0,.275, .2,-.075
*ANSI31, ANSI Iron, Brick, Stone masonry
45, 0,0, 0,.125

It does go on for quite a bit more, as I have Autocad Architecture, then towards then end it has this bit:

;; User Defined Hatch Patterns
;; Add any hatch patterns that you define to this section of
;; the file to ensure that they migrate properly when
;; upgrading to a future AutoCAD version. If duplicate hatch
;; patterns are found in this file, items in the User Defined
;; Hatch Patterns section take precedence over patterns that
;; appear earlier in the file.

I find it puzzling as to why the file is called acadlt.pat for LT, but maybe they are given less hatches out of the box.

STOP PRESS! According to Robin, a good plan is to run Autocad first time WITH ADMINISTRATOR RIGHTS! Should I tell the IT man?......

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