Spindle for homemade CNC
The idea of assembling a homemade CNC machine appeared long ago. Lack of knowledge and necessary details. Today there is everything! This is the first article in which I will show how I assembled the spindle. Electronics and the frame will be described elsewhere.
First of all, I assembled a spindle with a brushless motor. It was certainly possible to buy a ready-made router, but it has its drawbacks:
My router does not know-how, there are already such constructions on the Internet, I just repeated it and the experiment turned out to be successful. I have not conducted any serious tests so far, but the first launch and the attempt to milled the plywood were successful.
Brushless motor Aeolian C5045 KV900 (35$)
Rotation speed: 900 (KV) rpm / volts
DC: 80 amperes
Max. Current: 90 Ampere
Input voltage: 6-28 volts
Max. Performance: 98%
No load current: 2.6 Amps
Internal resistance: 21 m (Omega)
Motor, dimensions (diameter x length): 50 mm x 45 mm
To the motor the regulator of turns MYSTERY Fire Dragon 100A
To adjust is still needed servotester
The power supply unit is at 24 volts at least 10 amperes . Update: My motor consumed about 4 amps under load. I do not know why so little, they write that the motor is at 80 amperes. The answer to this question I never found.
I bought a motor specially with a shaft diameter of 8 mm, here and the bearing is large (it will last longer) and the pulley is easy to find with the same diameter.
I bought a collet cartridge with a shank diameter of 10 mm, although probably now I would buy it with a diameter of 8 mm, it would be simpler, because it was not easy to find a pulley with a diameter of 10 mm and a suitable number and size of teeth. In addition, it is possible to pull out the motor shaft from the motor and insert the shank of the collet chuck, in this case the need for a belt transmission is completely eliminated. In other words, the flywheel of the motor is placed directly on the shank of the cartridge. Although in this case there are drawbacks.
I have a simple design, only a few details of plywood and an hour of time spent on assembly.
The first test was with a battery from a screw driver for 18 volts, the battery is inserted. The belt allows you to get rid of vibration, and if the motor is put on a rubber cushion, the noise will be minimal. From above to the motor it is possible to screw the blades, which will blow it during operation.
The result of the spindle test is positive, in the following articles I will show how I will build a frame for a homemade CNC machine.
Update: My first CNC
I decided to update the old, already charred stand for the soldering iron. Simple and does not take up much space on the table.
I need a tachometer to calculate some mechanisms. For example, to calculate the speed of a robot vacuum cleaner, you need to know the rotation speed of the electric motor and, based on this, calculate the gear ratio of the gearbox.
The 3D model of the fan is very simple, easily wound on a collet clamp. I put it on my CNC machine. The first launch proved to be very good, all the chips are scattered to the sides, clean under the cutter.
This is my first CNC machine assembled with my own hands from available materials. The cost price of the machine is about $170.
Today, instead of round guides, the printer received square, using a conventional aluminum profile tube with a cross section of 20 * 20 mm. Bearings roll along the pipe 623zz. All plastic parts were printed on the same printer before it was altered.