Making a mandrel for a lathe

Fixtures / Metal

Added 4 commentary

In this article, the wizard will show us how to make a simple aluminum adjustable mandrel for a metal lathe. With this mandrel, the master is going to make rings.

For its manufacture, the following

Tools and materials:
-Lathe;
-Aluminum billet;
-Screw;
-Screwdriver;
-Set of drills;
-Bandsaw machine;
-Calipers;
-Marker;
-Tap;
-Vise;

Step one: aluminum billet
For the manufacture of the mandrel, an aluminum billet of cylindrical shape is needed. The diameter of the workpiece does not matter, the main thing is that it is installed in the chuck of a lathe.

The master cuts off six centimeters of the workpiece.

Step Two: Hole
Sets the workpiece into the chuck of the lathe.

It processes the end face of the workpiece, making the plane perpendicular to the axis.

Makes a countersink in the center of the workpiece.

The first hole is through. His master drills with a 13/64 drill (5.15 mm).

The second hole is drilled with a 25/64 drill (9.13 mm) to a depth of 3.8 cm.

Step Three: Groove
Next, the master measures the diameter of his little finger, index, middle and ring fingers.

Next, you need to grind the workpiece along the diameter of the measured fingers. The first groove starts from the cartridge to the largest diameter. Then the master steps back a little and pumps it to the next diameter and so on to the end.

Step Four: Carving
Countersink screw hole.

Now you need to remove the workpiece from the cartridge, install in a vice and cut the thread.

Step Five: Cuts
Now the master makes cuts on the band saw machine.

Step Six: Verification
To check the mandrel, the master installs it in a lathe, puts a ring on the mandrel and fixes it by turning the screw.

Everything works.

The whole process of manufacturing such a mandrel can be seen in the video.

November 22, 2019 19:31 0

Reply To quote A complaint

No one makes a groove with a grooving cutter; for this, boring cutters exist.

And why did you decide that no one? And what is this cutting tool? Yes, theoretically there is one, only no one uses it. Didn’t you hear about the stubborn passage? Moreover, here there is a universal mandrel with a replaceable carbide plate, which can be sharpened and cut. Moreover, such a mandrel can be used as a boring tool.
The tool is good, only got crooked and stupid.

Guest alexander November 22, 2019 18:22 0

The author’s interesting drills 5.15 9.13 it’s interesting how later and what thread he cut there. And still all sizes are in normal turners in millimeters. Nobody makes cutting holes for this. The author learns the materiel and will inappropriately use a marker.

Guest ALEXANDR September 21, 2019 11:17 PM 0

Well, it’s not yet clear why marking all the sizes of the rings, then grind it to the last, removing all marks ...

September 21, 2019 00:51 +3

What kind of "master" is this-

on a band saw? Does he have a blank in the chuck (although the pictures show that this is not so) or is there no cutting tool?

This is not a countersink, but a combined centering drill, angle 60 degrees. specially under the cone for processing in centers.

And right on the machine does religion not allow cutting? Or the machine is so primitive that it does not have a scale of dimensions (I won’t rush with abstruse words such as “limb” and “nonius”) and gearboxes with reduced gear, or the “master” does not know how to use it, that he has to make markings with a marker, and thread into a vise?

puts a ring on the mandrel and fixes it by turning the screw. Everything works.

It will work, even if the mandrel is made of wood and wedged with a self-tapping screw. I would like to see how this mandrel splits when clamping the largest ring (at the cartridge itself).

Making a mandrel for a lathe

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