What are the expected payoffs that accrue from being more sensitive to component detail? First, it is generally at the immediate component interface that people make mistakes, many of which may result in product damage or personal injury. Therefore, from the standpoint of product liability, we should try to prevent human error. Second, it is at the immediate interface that a great many of the confusions or stresses occur which make product users dissatisfied enough with a product not to purchase it ever again. This potential loss of future sales should stimulate the designer to try to provide the most effective interface possible the first time. Third, in this day of proliferating technology and hardware, competition is great with retrospect to making any product available to the largest market. If a product requires special user skill to overcome basic component interface deficiencies that product may end up only in the hands of a small number of consumers because the rest of the potential buyers are looking for something they can use easily and correctly without having to become experts.
Archive for September, 2009
New design ideas
09/29/2009Sometimes a new idea seems to have all the ingredients necessary to improve user efficiency, but because the immediate interface is so radically different from what people expect, we lend to induce operator error and confusion. Test each idea on a sufficiently large and representative sample of the expected user population to demonstrate either that few people seem to have problems or that appropriate indoctrination and training will overcome negative expectancies and that subsequent reversals are not probable.
Product design
09/29/2009Product design is the process of idea generation, concept development, testing and manufacturing or implementing the object or service. The Product Design deals with the more immediate interface between the systems, subsystem.
Although a system or subsystem may be well conceived in terms of what it does and what it requires the user to do, it can fail or become operationally less effective if the immediate interface design contains features that cause the user difficulties in making effective contact with it, either directly in terms of physical contact or indirectly in terms of perceiving through visual or auditory channels. Too often, consumers have been brainwashed into believing that difficult controls and displays, uncomfortable furniture, and hard-to-operate fasteners or locks are things they have to live with. This is hardly ever true. Most poor designs are due to the fact that the designer was not aware of human factors and therefore spent all his or her time making sure that the engineering features were satisfactory, that the component or product was easy to manufacture, or that the product was attractive. As a result the consumer reacts like a man who gets used to a rock in his shoe; even though the rock makes a sore spot on his foot or causes him to walk in a peculiar way; he tends to go about his business without stopping to remove it.
It requires competencies beyond traditional engineering and computer science to engage in a multidisciplinary team for the development of successful products and services which benefit the world.
REVISIONS STATUS APPLIED TO THE DRAWING
09/28/2009The revision status of a drawing is identified by an upper case letter. The first change issued in the Revision History block or the reference to the Revision Authorization Document (ADCN or DCN) is identified by the letter “A”. Each successive change uses the next letter of the alphabet in sequence, except the letters “I”, ”O”, ”Q”, “S” and “Z” are never used. Upon exhaustion of the alphabet, revisions are identified by letters “AA”, “AB”, “AC”, etc., then “BA”, “BB”, etc.. Revision letters shall not exceed two characters. The letter “X” is reserved for recording revisions to a drawing prior to its release. Changes beginning with “X1” and following with “X2”, “X3” etc for each successive change. The use of a dash “-” shall be used only for the initial release of a drawing. Initial release does not constitute the need for a revision letter and the Revision History block may be left blank
Reviewing Detailed Drawings.
09/26/2009Reference ASME Y14.3M. Check the following: Detailed drawings must completely depict the entire part or assembly shown. Ensure that there are sufficient views to adequately define the item. Ensure that all dimensions are taken from physical features. Reference ASME Y14.5M-1994. Detail drawings should not show the dimensions for hidden lines. Reference ASME Y14.5M-1994. Ensure that datum planes are properly defined. Reference ASME Y14.5M-1994. Ensure that mono-detail drawings depict only one item.
Datum Referencing.
09/26/2009A datum indicates the origin of a dimensional relationship between a toleranced feature and a designated feature or features on a part. The designated feature serves as a datum feature, whereas its true geometric counterpart establishes the datum plane. Because measurements cannot be made from a true geometric counterpart,which is theoretical, a datum is assumed to exist in, and be simulated by the associated pro-cessing equipment.
Virtual Condition
09/26/2009A constant boundary generated by the collective effects of the featuresize, its specified MMC or LMC material condition, and the geometric tolerance for thatcondition.
Regardless of Feature Size (RFS)
09/26/2009The term used to indicate that a geometric toleranceor datum reference applies at any increment of size of the feature within its tolerance limits.RFS is the default condition unless MMC or LMC is specified. The concept is now thedefault in ANSI/ASME Y14.5M-1994, unless specifically stated otherwise. Thus the sym-bol for RFS is no longer supported in ANSI/ASME Y14.5M-1994.
Solidworks quick_reference
09/25/2009The quick reference file normaly located in:
C:\Program Files\SolidWorks\lang\english\quick_reference.pdf
This file has a very interesting icon- quick reference
includes Keyboard Shortcuts for Common Functions
Keyboard Shortcuts: Filters and more…
Revision Table
09/24/2009Insert a revision table into a drawing to track document revisions, including revision symbols. In addition to the functionality for all tables, you can select:
- Revision symbol shapes
- Alphabetic or numeric sequence
The latest revision also appears under REV in the lower-right corner of a sheet format.
In drawings with multiple sheets, you can set options to activate a revision table on the first sheet only, link the tables on all sheets, or keep the tables independent of each other.
Text font, edit lines and arcs.
09/24/2009The operation is called “dissolve sketch text” To dissolve sketch text into separate sketch entities: In an open sketch, right-click the text (the pointer changes to when it is over the sketch text) and select Dissolve sketch text. The sketch text is converted into non-text sketch entities (for example, lines, arcs, splines, and so on).
K Factor / Set Back
09/21/2009Set Back (Applicable To Closed Angles Only). This is the deduction made in the length of a flat pattern development corresponding to the amount of material saved by bending around a radius instead of a sharp corner.
Basic Dimension:
09/21/2009A numerical value used to describe the theoretically exact size, orien-tation, location, or optionally, profile, of a feature or datum or datum target. Basic dimen-sions are indicated by a rectangle around the dimension and are not toleranced directly orby default. The specific dimensional limits are determined by the permissible variations asestablished by the tolerance zone specified in the feature control frame. A dimension isonly considered basic for the geometric control to which it is related.
Reference Dimension:
09/21/2009A dimension, usually without tolerance, used for informationpurposes only. Considered to be auxiliary information and not governing production orinspection operations. A reference dimension is a repeat of a dimension or is derived froma calculation or combination of other values shown on the drawing or on related drawings.
Virtual Condition:
09/21/2009A constant boundary generated by the collective effects of the featuresize, its specified MMC or LMC material condition, and the geometric tolerance for thatcondition.
Limits, Upper and Lower (UL and LL):
09/21/2009The arithmetic values representing the maxi-mum and minimum size allowable for a dimension or tolerance. The upper limit representsthe maximum size allowable. The lower limit represents the minimum size allowable.
Maximum Material Condition (MMC):
09/21/2009The condition in which a feature of size containsthe maximum amount of material within the stated limits of size. For example, the lowerlimit of a hole is the minimum hole diameter. The upper limit of a shaft is the maximumshaft diameter.
Degrees of Freedom:
09/21/2009The six directions of movement or translation are called degrees offreedom in a three-dimensional environment. They are up-down, left-right, fore-aft, roll,pitch and yaw.
Datums
09/21/2009Datum Plane: The individual theoretical planes of the reference frame derived from aspecified datum feature. A datum is the origin from which the location or other geometriccharacteristics of features of a part are established.
Insert an OLE object or a “logo”
09/20/2009Click Insert, Object…. Select Create from File and click Browse….Select the “Picture.bmp” file and click OK.
So far the bmp files are the only ones that works properly, try to avoid .gif or any other common graphic files.
To move the picture.
Drag the logo so it the top left corner is located just inside the trimmed border.
3dcadware
fredvierheller
bob92003
Deepak Gupta