DP 200 Digital Projector

DP 200 Digital Projector

This is the Schneider DP200 DP stands for digital proejctor The 200 the horizontal size of the XY stage It replaces the shadowgraph, which has been used for many decades to project the silhouette of a component onto an opaque screen for inspection and measurement The DP200 is a digital camera system that views small areas of a large XY stage The range of the XY stage are available from 200x100mm which is the one being demonstrated but there also a 300x200mm, 400×200 and 500×200 Because the digital camera looks at a small portion of the whole surface being inspected a range of objective lenses are available one of which will be specified when ordering. Because of this, the viewing areas vary from 4.3 x 3.4mm up to 26.5 x 21.2mm in five convenient magnifications depending on your application This system has a 13.2mm x 10.5mm objective lens which is the mid-range option and addresses a large portion of the applications we see Because you only view a small portion of what could be a large component, the XY stage is moveable anywhere in its range it is fitted with a dual heidenhain grating with 1 micron resolution. which means you can accurately assess large geometry to high accuracy. The table also has a stainless steel surround with double tee slots, parallel with the direction of movement. This enables easy fixturing. The telecentric lens means the focus on the surface of the plate and above the surface is parallel – a slip block will show the same result on the bottom and the top of the surface there is no optical distortion. This is a major feature of the Schneider DP200 Today, behind all good instruments, is powerful software. but this is not only powerful – it is simple. This means you do not need a skilled operator in the metrology laboratory This is an instrument that needs little more than 10 minutes training This is as useful for the inspection room as on the shopfloor Let me show you what it can do. The screen is free of words – just simple icons in the top right hand corner is the X, Y and angle position these can either be absolute values or relative for easy point to point dimensioning If you want a crosswire, press the icon if you want reference circles, press the icon. if we want reference geometry we can select a chamfer, we can select a fillet, we can select an angle, or a diameter of any size on chamfers, we can move them through 90 degrees and exactly the same for fillets on angles, we can select the speciific angle we require and again move them around by 90 degrees Let’s look at a typical measurement problem, not putting the component on square introduces errors. If we take a slip block, if we measure it here we get the correct answer but if we measure it here it is wrong. Let’s put the component on incorrectly. So we first of all put the component intentionally wrong onto the surface and we align the first edge and zero our X and Y coordinates then we can move the slip block to the other edge we can now line it up onto the second edge and you’ll see in the X value there is more than half a mm error in 30mm so now we are going to teach the system the angle at which the component has been put on first of all we align the point which become the pivot point we can then move across to teach the system the angle at which the component sits and now rotate the coordinate system according with how the component sits on the surface now that we have taught the system the orientation of the component we can align onto the first edge and zero the X and Y coordinates and go to the second edge and because the coordinate system is in line with the angle of the component we’ll see that the error is only a few microns ok, so I only found that by eye. but everyone has a different opinion but this software system can automatically detect the edge a green line indicates that point and as we accelerate in towards it a red line comes in and tells us how close we are to the intercept once it’s aligned it turns green and we can zero the X and Y By going to the opposite edge, the edge detection will automatically see the difference and a red line will come in from the edge turning green at the exact intersect. Lets look at this demonstration component which has holes, angles and blind slots the component you are measuring is usually a known design we used to use overlay templates on the shadowgraph screen but now if we have the outline shape on CAD package you can export the DXF file to be used as a template once you have loaded the DXF file we can align the component to the origin of the DXF – zero zero and set this as our datum pivot point you will now see that the template is on top of the profile we can see the component is not square so we can teach it the angle at which the component is set and then rotate it to align the DXF with the actual component by using a pin we can do a fine adjust so that the template and component overlay then we can see around the profile any error you can switch on a top light and see details which you would never see with a shadowgraph where the light cannot pass through and you can repeat all the geometric measurements on hidden detail

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  1. For further informations please visit: http://www.dr-schneider.de/en/products/projektor/dp-series/

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