The ULTIMATE in lathe accuracy! A GRIP-TRU collet chuck. This Collet Chuck has a D4 mount and is to be fitted to a D8 spindle.

In this video I convert a faceplate into a mount for an ER40 Collet Chuck. The difference in spindle size is significant with the D4 spindle being 125mm and the D8 spindle is 220mm.

The objective is to create the most accurate Collet Chuck with the collet taper returning a 0.003mm (0.00018”) TIR.

Timestamps:
0:00 Introduction
1:10 Titles
1:20 Description
2:45 Machining set-up on the Mill
3:35 Trepanning the faceplate
5:20 Separating the centre from the outer rim
5:44 Turning the outer edge
6:25 Centering the plate on the Mill
7:45 The first plunge cut
8:04 Setting the DRO
8:50 Milling the dimples around the periphery of the plate
10:29 Machining the plate on the lathe
10:54 Changing the cutter
11:10 Turning the groove with a form tool
12;20 Facing the plate and machining the relief
13:55 Changing the insert
14:54 Test fit
15:10 Setting the DRO
15:51 Drilling and tapping the mounting holes
17:30 Drilling and tapping the set-tru holes
19:10 Set up the chuck on the Mill
20:12 Setting the DRO
20:40 Drill and counterbore the mounting holes in the chuck
23:05 Machining the push rods on the Colchester
23:45 Final assembly
25:15 Dealing the chuck in on the lathe
27:50 Final check
28:40 A new collet
29 20 Testing the accuracy with an arbor
30:15 Conclusions
30:50 End