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Shown is the manufacture of a collet chuck for the MN-80 lathe. The chuck is designed for clamping collets in accordance with GOST 2876-80.
A ramrod in the form of a pipe with threads at both ends is screwed into the cartridge. The chuck is inserted into the spindle cone of the machine. At the other end of the spindle, the cleaning rod is attracted by a special nut. Now that the collet is secured, the collets can be inserted into it.
How I made a nut and a rod of a ramrod, I will show in the following videos.
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Lathe MN-80. Modernization":
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I got a set of collets. I liked it because it has a lot of collets - 42 pieces, of which 19 are different and the maximum diameter of the part to be fixed is 16 mm. The collet did not fit my machine. When turning it, it broke. I had to make a new one. It is detailed and shown how I made this new cartridge.
To process the 1:20 taper, it was necessary to turn the upper part of the support by 1 ° 25´ 56 ", that is, with an accuracy of seconds. But it is impossible to set the slide with such accuracy, for such machines the counting scale has a division of 1 °. This is first And secondly, it is not known what the actual angle of the tapered hole in the spindle is.
Therefore, I set the upper slide with a running-in indicator along the tapered hole in the spindle. In my opinion, the method of aligning the upper slide along the taper into which this collet will be inserted during operation is the most accurate.
It is described in detail about grinding a landing cone for collet. In the old chuck, the inner cone was bored shallowly, therefore, the collets entered the chuck shallowly, and the compression force of the collet was applied only on the small diameter of the collet cone. And the collets should be crimped over the entire surface of the cone.
To do this, the cone in the chuck must be bored more so that the collets go deeper into the chuck and squeeze the parts evenly over the entire contact surface, and not only squeeze the tip.
Shown is a schematic drawing to illustrate the above.
And if the part is short, not for the entire length of the working part, then the collet will be weak. And when a lot of force is applied to still fix the part, the collet petals are deformed up to permanent deformation. On collets, this deformation is clearly visible.
This is how I made a collet chuck for clamping collets according to GOST 2876-80.