Mystery Super Small Carbide Cutters & Holder

Mystery Super Small Carbide Cutters & Holder

This topic has 7 replies, 4 voices, and was last updated 19 April 2023 at 22:18 by Martin King 2.

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19 April 2023 at 15:59 #641906
Martin King 2
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@martinking2
Hi All,

Just going through a pile of auction lots and came across this small tin of really small brazed carbide cutters and ONE holder or collet.

Each cutter has a spring at the back.

The back of the "collet" has 4 numbers as shown?

I am guessing watchmaking lathe or similar but no idea really?

Any help most welcome

Cheers, Martin
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19 April 2023 at 15:59 #34208
Martin King 2
Participant
@martinking2
19 April 2023 at 16:13 #641907
Martin Connelly
Participant
@martinconnelly55370
Drag engraving or vinyl cutting maybe?

Martin C
19 April 2023 at 16:14 #641908
JasonB
Moderator
@jasonb
Look similar to the microbore system which can be had with brazed or insert holders, I've a couple of the insert ones and use them for things a bit bigger than your average watch.
19 April 2023 at 17:51 #641918
bernard towers
Participant
@bernardtowers37738
I have some similar to that and came to the same conclusion as Jason, they are still in the drawer!
19 April 2023 at 18:11 #641921
Martin King 2
Participant
@martinking2
How are these held in the lathe and what is the spring for please?

Martin
19 April 2023 at 18:29 #641922
JasonB
Moderator
@jasonb
The boring bars have a suitably shaped socket with a couple of pockets to that the small lugs so that the tool does not rotate in the hole. You unlock the tool and turn the adjuster which looks to possibly be 10 divisions down the side so 40 divisions total so if a 25tpi thread one division on the sid eof the adjusting screw will advance the tool 1 thou. Put on the required cut and lock it back into position and take a cut. Spring ensures the cutter moves outwards as the adjusting nut is turned.

The Microbore ones that I have have the graduations on a square head flange nut and use spring washers on the opposite side to so the same job as the spring on your ones
19 April 2023 at 22:18 #641945
Martin King 2
Participant
@martinking2
Thanks Jason, all now crystal clear.

Cheers, Martin
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