How do they?

Make these. I’m sure it’s obvious but how do they hold the sleeve whilst they make the cuts? Only asking because it might be handy to make odd sizes of these from time to time.

**LINK**

This should point you in the right direction, Vic

**LINK**

https://www.fingers-welt.de/info/Drehen/16erSpannzangen%20C8.pdf

MichaelG.

… and, if you want to see the John Moran version, don’t bother with the reference in that article

look here:instead : **LINK** : https://www.gadgetbuilder.com

MichaelG.

.

Quote: A holder is used to secure the collet for slitting

Edited By Michael Gilligan on 15/11/2021 08:45:06

Thanks for that Michael. Obvious when you think of it. In my defence, it was quite late when I posted the question.

Hi Vic, I made one 1/2 to 8mm earlier this year, sorry no pics of the job but I used 1/2" Silver steel held in a collet, bored and reamed the 8mm bore. I then mounted it on mandrel made from 1/2" BMS with an 8mm shank and threaded portion for a nut and thick "washer" to lock the item in place. This was then mounted in a square ER collet block for cutting the slots on the mill.

John

We used to wonder how they got the figs into the figrolls ?

Never did find out !

Thanks John, all useful info. At some point I need to grind a tiny boring tool for jobs like this!

Best way is use say 3/16” dia HSS and grind similar to the ones at the RH of this photo, more pics In my albums. You need to reduce the cutting end only to about half the diameter, grind some clearance behind this, simple to do free hand. The only reason for boring the collet after drilling was to ensure the hole was straight before reaming.

Edited By JohnF on 16/11/2021 09:49:48