Category: Machine conversion

Grinding device for the lathe

Builder: Wolfgang Lundelius

Creation time of the model: approx. 5 hours

Total cost: approx. 51€

Level of difficulty: Advanced

Close-up of a lathe with a grinding disc working on a golden drill. The disc rotates and produces grinding dust. Precision work with metalworking.

The project

In this customer project, a grinding device was built for a lathe to enable tools such as drills and milling cutters to be re-sharpened cheaply and easily without a graver.

Material used:

Diamond cup wheel Ø 100 with 20 mm mounting hole
ER16 collet chuck, cylindrical Ø 12 mm
Two M6 locking bolts
Clamping lever M6
Aluminium block 30 x 30 x 60 mm
Aluminium block 15 x 20 x 60 mm
VA shaft Ø 40 mm, approx. 60 mm long

For legal reasons, we must point out that the conversion or modification of a machine can lead to the loss of CE conformity and the manufacturer's product liability. Paulitschek Maschinen- und Warenvertriebsgesellschaft mbH accepts no responsibility if the machine is not operated as intended or has been significantly modified after the conversion.

Tool used

Milling machine F400-G
Lathe PM190-V
Dividing head
Corner turning tool
Centre drill
M8 and M6 taps
Core drill
countersink
rotating centre point
face milling cutter
Drill Ø 12mm
Edge finder

Step 1

Make the holder for the grinding wheel

The first step was to determine the length and diameter of the shaft for the lathe and the corresponding quick-change steel holder. In this case, a shaft with a diameter of 40 mm was first face-turned. The holder for the grinding wheel must be turned precisely (exactly to 20.00 mm). Next, the shaft was drilled with an M8 hole using a core drill and then the M8 thread was cut through. Both sides of the thread were then machined using countersinks. For better concentricity, the shaft was finally re-clamped and longitudinally turned once using a travelling centre point.

Close-up: Metal bar in lathe. Red machine part on the left, grey base. Metal chips visible. Blurred due to rotation.

Metalworking: A lathe with a clamped, cylindrical workpiece. Chips are visible. Focus on the machining process.

A lathe can be seen at work. A workpiece clamps between two tool heads, rotates quickly and is machined. Chips are lying around.

A digital caliper measures a round metal part with a hole. The display shows 20.00 mm.

A digital measuring gauge shows 20.00 mm, which measures a conical metal object. A drill and other small metal parts lie next to it.

Close-up of a mounted, conical, silver metal assembly with threaded connection. Two screws rest on a blue surface.

Close-up of a lathe with a clamped, reddish-brown grinding wheel. The machine is silver, the background is blurred.

Step 2

Create holder for quick-change steel holder

First, the two aluminium blocks were milled flat on all sides. The hole for the collet holder was then drilled into the 30 x 30 mm block. This was then machined with a countersink. The block including the collet holder was then clamped with the dividing head and the 3 mm holes for the locking bolts were drilled. Next, an M8 thread for the locking screw and the two threads for the locking bolts were cut in the centre. Finally, the M6 hole for the clamping lever was drilled into the 30 x 30 mm block and the M6 thread was cut into the other aluminium block.