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Would you buy one of these collets?
| old mart | 12/10/2019 19:38:01 |
| 4655 forum posts 304 photos | The shank of an R8 toolholder is 15/16", (23.8mm) and the length of the tapered end is 1", if you use a standard collet for a 20mm cutter, the depth is limited, a 3/4" size is the biggest that gives a decent choice of fitted depth. I use up to 80mm shell mills regularly with R8, but don't bother with any solid cutters above 20mm, and 16mm with ER25 collets. The threaded shank cutters used in the small series Clarkson, Osborn and Acramill go up to 16mm shank with cutting diameters up to 20mm. The larger threaded shank holders in R8 go up to about 32mm. ER collets in 32 and 40 sizes are ok except, the limitations of the R8 only allow a relatively short amount of shank just the depth of the collet length. |
| Nigel Graham 2 | 12/10/2019 20:03:35 |
| 3293 forum posts 112 photos | I can't see that collet as illustrated having much holding power at all. The grip on an R8 collet is given by the portion of the taper within the spindle, and it's hard to see what that protruding section can really achieve. I prefer the Autolock for most work, keeping the R8 collets only for small diameter cutters, centre-drills and the wiggler. |
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All Forum Topics > Manual machine tools > Would you buy one of these collets?