A QUIET KID | MODEL CONSTRUCTION

Most Amateur designers are constrained not only in space (usually for doing something they have only a small area in the apartment), but also in time (to devote to this they can only the late evening or early morning when the household is asleep). Some work can be done quietly, but this operation, like drilling holes, connected with considerable noise, and basically it makes gear drills, both electric and manual, although often large cutting speeds and power tool is required.

Such circumstances have prompted me to do a little lapping work hard.

Mini machine consists of base, rack, table with lifting mechanism, cantilever platform and spindle of the spindle drive.

The basic material for the manufacture of the frame was plywood sheets of different thicknesses. Thus, the base and the spindle console made of plywood 20 mm thick with the same dimensions in plan — 180×90 mm. strips of 10 mm plywood and made a stand with a height of 230 mm, consisting of shelves with a width of 50 mm and the edge 40 mm width. Elements connected with glue and screws with countersunk head, form a t-section which provides the necessary rigidity to the whole frame. To the ends of the strut in the same way attached to the base and spindle to the console and the connection further strengthened by cuts aluminum area is 20×20 mm, privernutyh screws. With the front of a shelf lined with plastic to give it better gliding slide the lift table. To the back part of it, equidistant from the upper and lower body are attached a 3-mm dural plate size 140×50 mm, serving as a rolling surface for the rollers when moving the table. In the middle part of the rib rack, adjacent to the shelf, made a groove for the passage of the axis of the rollers when lifting-lowering of the table, and the edges of the groove — small sample under the plate.

Layout drill, mnni machine (and the first spindle Assembly and the lower position of the working platform lifting table; b — of the second embodiment spindle Assembly and the upper position of the working platform lifting table)

Layout of mnni drilling machine (a — with a first embodiment spindle Assembly and the lower position of the working platform lifting table; b — of the second embodiment spindle Assembly and the upper position of the working platform lifting table):

1 —the base (plywood s20); 2 — edge (plywood s10); 3 — plate (duralumin, sheet, 140×50, VZ); 4 — Z-shaped halves of the bracket (aluminium, sheet s); 5 — axle with support rollers (M4 bolt the two bearings 23); 6 — spindle console (plywood s20); 7 — switch; 8 — strengthening (aluminum, area 20×20); 9 — electric motor RD-09 (from the tape “Dinah”); 10 — spindle Assembly; 11 — angle brackets (steel, sheet s2, 2); 12 — push rod (steel, sheet s2); 13 — the working platform (plywood b 12); 14 — lever (steel, sheet s2); 15 —supports (aluminum, a 40×40 area); 16 — electric motor KD-25; 17 — three-jaw Chuck; 18 — slide; 19 shelf (plywood s10)

Details of lifting table: slider with size in terms of 80×50 mm and a working site — 130×60 mm made of plywood 12 mm thick, connected to the groove-joint adhesive and further sealed to the sides of the squares made from 2 mm steel plate, and screws.

Edge corners slightly protrude relative to the back plane of the slide and serve as guides for the table when it is moved along the rack. Overhead angle brackets may be used and manufactured in the factory — those that serve to strengthen the window frames.

The lift table is held and moved on the rack by means of a pair of rollers — a series of ball bearings 23 located behind the flange on a common axis and fixed against axial displacement of the distance sleeve with a corresponding internal diameter. Here it would be possible to do a roller set in the middle of the axis, but then it needs to be wider. The axle is inserted into the holes of the rear ends of the Z-shaped halves of the bracket, bolted to the slide table, screws. The gaps between the RAM and shelf fixed spacers between the bracket and the slider.

Bracket connecting rod pivotally connected with the lever lifting mechanism of the table. The lever is mounted on the axis of the support, which is rigidly attached to the base. All axis — M4 screws with a thread only at the end. The connecting rod is made of steel sheet 2 mm thick in its lower hole tapped M4, which when connected with a lever screwed the axle bolt and lock nut. Support with lever matched ready, but they are easy to produce and push a lever from the same material as the rod, the prop — of the pair of segments dural area is 40×40 mm, slightly shortening the lower shelf, and as the axis to use, as in other connections, the bolt M4.

Due to the fact that the linkage provides a relatively small vertical travel of working table, the machine design provides two working positions of the table: with top location of the site relative to the slide, or from the bottom. For installation in the lower position the platform along a symmetry axis about the slide made the cut 20×3 mm for the passage of the connecting rod. To install the pad in the third, intermediate position in the connecting rod made an extra hole for the axle bracket.

Spindle Assembly of the second variant of the layout of the mini-machine

Spindle Assembly of the second variant of the layout of the mini-lathe:

1 — collet Chuck (brass LS59); 2 — a clamping nut (steel 20); 3 — driven pulley (aluminum); 4 — bearing housing; 5 — bearings 27; 6 — Bush (aluminium) 7 — the console (plywood s20)

circuit of the motor RD-09

Circuit of the motor KD-25

While working on stanochek I use two options for spindle Assembly. In the first embodiment, when it is required to drill small holes with a diameter of 1.0—1.5 mm, for clamping drills use a homemade collet made of brass stamps LS59. In contrast to conventional devices in which the clamping sleeve is usually divided into three sectors, cut my four. Technologically, it’s much simpler: it is necessary to drill the axial bore and two mutually indicate instead cutting strictly along the axis. Operation is best performed on a horizontal milling machine, but you can cut and hand — slizovskiy.

The rotation of the spindle with the collet is given by RD-09 via the lower belt drive with pulleys on the tape, “Dinah”. Below the belt is slipping when a relatively high load, is mounted between the pulleys tensioner pulley — ball bearing series 26 with an outer diameter of 19 mm (not illustrated). This top hole of the console insert the axle (bolt M6), and the bottom put on the sleeve remote from the bearing and secured with the nut.

The motor RD-09 is designed to operate from AC network with voltage of 127 V, however, if it’s included in the given scheme, it works reliably and from 220 V. in the absence of such engine it is possible to use motors of the type EDG from the gramophone player or tape recorder “Comet”.

In the second embodiment, in the node using a more powerful spindle motor type KD-25, the shaft is by using a plug baited with a standard three-jaw Chuck designed to clamp drill of diameter up to 6 mm. the Engine is mounted on a spindle console screws M4 distance bushings (nuts M5) for unimpeded passage of air for cooling. Circuit of the motor KD-25 are shown in Fig. The working condenser should be sealed with a cover, and the wiring connection is to isolate. You can also use a tape engines CD-3.5, CD-6-4, BP-5 and other with capacity of 25-40 watts. Some of these motors operate at a voltage of 127 V, however, it is possible to do without step-down transformer, using the circuit of the RD-09. Before installing the engine, you should check whether the shaft support, retaining it from shifting in the axial direction, as when it senses the drilling axial force. In the absence of support need to install a ball with a diameter of 3-4 mm at the end of the motor shaft.

Long-term operation of the machine showed that it can be used not only as a drill. Sufficient power of the engine of the second variant enables to adapt the machine for turning operations, securing it to the workbench on the side faces of the base and the console of the spindle. Small metal or plastic parts clamped in a cartridge, you can handle files and needle files. Thin axial holes in the material type of brass pervym successfully drilled with a drill made from guitar strings with a flattened and sharpened end. In this way I was able, for example, to produce a jet of idling of the carburettor VAZ. If from the machine to remove the table and lifting device, and the base and bracket of the spindle to connect the front area (or even rack), which will become a makeshift armrest for cutter and set on the base coaxially with the hub spindle spindle, with the pointed end serving as the tailstock, you can use a lathe and small lathe work on wood.

A. NIZOVTSEV

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