The well-known technique of using limbs when turning several identical parts on a lathe is shown.
This technique simplifies and speeds up the production of identical parts on a lathe, but it can only be used if there is a fixation of the tool holder, as on this machine.
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When the tool holder is loosened with this handle, it can only rotate freely counterclockwise. When turned clockwise, the tool holder locks in four positions with good accuracy.
With this machine of mine, the spread in the positioning of the cutter when re-fastening the tool holder is 2 ... 3 hundred parts.
He worked on two limbs.
Along the longitudinal feed limb, measured the feed of the cutter in the axial direction. And along the transverse feed limb, it counted the feed of the cutter when turning diameters.
And most importantly, he remembered the position of this limb - that is, the number - with each grinding.
This is necessary so that when turning all subsequent parts, set the cutter in the same positions as when turning the first - exemplary - part. In order not to take measurements every time.
First, the technique is shown with an example.
This technique can be used when turning several parts, when you have to alternately use several cutters, that is, turn the tool holder.
Then it is shown how I used this technique with the example of turning bolts.
The cross feed limb must not be touched during the manufacture of this bolt lot.
All subsequent bolts, except the first, I have already made without measurements with a caliper and a micrometer, by limbs, by the same numbers, the same for all bolts of this batch.
This method of working on the limbs simplifies and speeds up the manufacture of identical parts on a lathe. In addition, this reduces the variation in the size of the part in the batch.