Will need
To make a homemade product, we will make do with simple materials and components:
- plexiglass;
- screws 3.0×16 mm;
- bearing;
- round flat magnet;
- glue.
When working on a marking device we will have to use: milling and drilling machines; jigsaw; mechanical emery wheel; Dremel; vices, clamps and clamps; screwdriver and mallet.
Considering the purpose of the device, we will have to use: metal ruler; square with stop; marking thicknesser; compass; scribe; protractor protractor.
The procedure for working on a marking device
From plexiglass we make the main elements of universal markings - two plates 14x20 cm and 14x13 cm.
We mark a corner cutout on the large plate along the length from the smaller side at 45 degrees.
Mark the groove for the ruler.
Using a large plate and a ruler, we mark the smaller plate and give it the shape of a “house” with a “roof” angle of 90 degrees and a “base” of 14 cm.
We combine the plates with equal sides and use a protractor protractor to control the coincidence of the sides.
After adjustment, use the milling head to mill a groove for the ruler so that one of the side faces runs exactly in the center of the plates.
We remove the protective paper, place a ruler in the groove, apply a second plate and check the movement of the ruler.
Using a marking thicknesser, we mark the holes for the mounting screws.
We check the accuracy of the relative position of the plates horizontally and vertically by installing them on a flat surface and using a square.
We fix the plates with two clamps and drill holes, drilling out sockets for the screw heads.
Before fixing the plates, we check the accuracy of their location using a ruler installed in the groove, by marking a right angle on a rectangle of multilayer plywood.
We drill the previously marked holes on the plates and fasten them with screws.
Using a ruler, compass and square, we mark a semicircular cutout symmetrical to the total area of the two plates. Using a jigsaw, we make a cut and cut off the sharp edges of the large plate.
We sand the cutout profile with sandpaper on a cutter mounted on the spindle of the drilling machine.
We drill a series of symmetrical holes with two twist drills and one feather drill on a large plate.
We unscrew the screws and separate the plates.
We mill a blind recess in the center of the groove for the ruler.
We round the ends of the cutout using a mechanical sanding wheel.
If desired, you can stick a measuring tape on the ruler. On a small plate parallel to the base, draw a line in the center between the top point of the cutout and the outer corner.Remove the protective paper and polish the plates with a Dremel using polishing paste.
We “place” a bearing on the glue in a large socket in the plate. For a better fit, use a plastic mallet.
We also install a round magnet in the socket located in the groove for the ruler. Remove excess glue with a napkin.
We place the ruler in the groove, where it will now be held by a magnet. We assemble the plates using three screws and a screwdriver.
We test the marking device by drawing a right angle on a standard rectangular plate. Checking it with a protractor protractor confirms the absence of inaccuracies.
Using a homemade marker
Our device can perform a number of markings and operations:
- Marking and installation of dowels. We place the device on the end of the workpiece, insert a limiter rod into the hole from below, which, sliding along the surface of the workpiece, will ensure that a parallel line is drawn with a pencil inserted into another hole.
- Drilling holes. We move the limiter rod into another hole so that it slides along the outside of the workpiece. We bring the bearing to the mark and perform drilling.
- Marking the center of a round part. We rest the sides of the corner groove against the side surface of the workpiece and draw a line in the area of the center using a ruler with a pencil. We rotate the part and draw a line again. To control accuracy, we also perform the third line. The intersection of the lines will be the center of the circle.
- Setting the milling depth. We place the marker over the cutter and rest the end of the ruler against its end. Using the sight on the plate, we determine the exit height of the cutter.
And these are not all the applications that this device can have!
