I tried to present it in as simple a language as possible.
Recently, a friend who was selling chocolate fountains in St. Petersburg came up with an unusual offer. The fountain was returned to him, where the screw that raised the chocolate did not spin. I love tasks like this, when few people can (or want to take on) repairing individual things and you need to rack your brains a little how to make rare spare parts with your own hands.
After disassembly it became clear that the problem was in the gearbox. One gear literally melted on the shaft (the quality of the components was simply excellent. Most likely, the gear slipped for a long time, then heated up. The fountain was turned off, the gear again stuck to the shaft with an offset center. Then it was turned on again and several teeth, unable to withstand the load, broke off) . It’s impossible to find the exact same gear, so I decided to make a new one from the equipment that was nearby.
Options creating gears there are a lot, I will tell you only about one of them. In my opinion, it is the simplest and most effective.
Step 1. Development of a gear drawing
You will need:
- any vector editor
- calipers
- gear generator (I used this online service)
So, we count the number of teeth of the broken gear. We enter all the parameters and take measurements.
Download the drawing file. I drew the inner star myself in Corel, because... I didn't find the required parameter.
When calculating the internal diameter of the gear, you need to maintain a delicate balance between spinning and cracking from strong tension.
Step 2. Making the gear
The material of the new gear is transparent plexiglass. Just search in a search engine laser cutting in your city and go there. It’s better to cut several with different parameters at once. I think one cut like mine shouldn’t cost more than $6.
Step 3. Launch and test the fountain
In general, adjacent gears are usually made from materials of slightly different densities. This way they will last longer. Most likely the manufacturer simply neglected this.
Lubricate, launch, rejoice!
Good luck in your work!
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Details for bodyboards
Busyboard consists of various small parts, details and Supplies:, watches, lacing - all this helps children effectively develop early age fine motor skills in a playful way, improve ingenuity, thinking, manual dexterity, attentiveness and intelligence.
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To make a business board correctly modern type, you need, firstly, to know that its elements are arranged in groups (blocks) next. purpose: Motor - for the development of initial motor skills. Motor-applied - to consolidate initial motor skills by handling small moving things of everyday use. Maria Montessori's busy board contained only this block. Associative - to accelerate the development of abstract thinking based on fixed motor skills. Colored, because Full development of color vision contributes to better success in all areas. points.
Manufacturing spur gears on a CNC machine is not particularly difficult. It is enough to set the contour of the workpiece and the cutter will repeat it. A much more complex problem is the calculation and design of the gears themselves, especially if they have a non-standard configuration. An example of these are gears whose geometry is different from a circle. There are known variants with a plan approaching a triangle, a square and some other shapes.
The desire to make such unusual gears came after browsing the Internet. A drawing of a square version was found on one of the foreign sites. After a little modification, which consisted of changing the scale, the prepared control file was loaded into the machine controller. The material used is 6 mm birch plywood, the tool is a milling cutter with a diameter of 1 mm. After manufacturing and assembly it turned out to be very unusual design. Until recently, I couldn’t believe that the gears would turn. However, they are spinning!
Finished square gears
The resulting design is well suited as a souvenir. Techies just go crazy over it. Some even use it as a calming element. It turned out that simply twirling them in your hands is enough to calm your psyche.
The vector file with gears is in the section. To ensure rotation, the gears have different shape, so it is necessary to produce both of them.
