Would be interesting to know exactly how the double diamond fits onto the carrier bar. Screwed or spigoted or both?

And here's the link on his channel for the universal tool;

Looks like a smaller conventional diamond shaped insert at each end held with a screw.

Can't see what it does at the back that you can't do with ordinary tools at the front.

I suppose Double Diamond works wonders…

The commercial Impero tool-post system included similar double tool-tip devices albeit (apparently) more versatile in being capable of setting at different angles.

See **LINK** and **LINK**.

Doesn't look to be an inexpensive set-up but seems to have been on the market for at least a decade so there must have been sufficient practical virtue in the tooling set-ups for hard headed commercial shops to buy the sets. Especially as the system doesn't handle common square shank tooling and bits as well as more conventional QC systems. I imagine that, as usually with odd-ball equipment, you need to rethink the way you approach jobs to get the best out of the system.

Clive

Interesting. No longer available because few were sold says it all really. I can see it would be useful if you only use a four way tool post – it could save you quite a lot in tool holders. Not quite so useful if you use a QCTP. I’ve actually got a double sided insert tool holder for left and right cutting but must admit I’ve never turned it over! 😊

MEW November 2016 page 35

Fairly similar idea by a chap called Richard Smith documented over 2 issues. Have been wondering for a while now about having a go.

Bill

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Welcome, Cam

First question is about the post locking: There appears to be a flat-ended pushrod, locking a close-fitting post into its hole … so have you seen any probems with bruising of the post ?

Some comments on choice of materials and tolerances would probably be useful.

Thanks

MichaelG.

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It isn't … The tool is featured part way through episode 21 of a series

MichaelG.

Hi Michael, the tool is probably a chrome moly at around 30 RC. It doesn't look like it has had any heat treatment other than the blueing as I can touch it with a file. The post is a nominal 12mm in diameter with a 0.03mm clearance on the hole. The pin is a precision ground dowel at 3/8" diameter and 2 1/4" long. As I mentioned in the Video I've given this tool an absolute hammering over the years and has not failed me once. I cannot see any visible deformation of the "post" from the dowel locking onto it.

Hi Nick, no a diamond tool is certainly nothing like a slotter. I had a number of requests during the "Powered Lathe Slotter" build series to give a description of how it works and how it is put together. I included this description as part of episode 21. As I mentioned, it is extremely versatile and very quickly adapted to suit both left hand and right hand turning, facing, counter boring up to 5mm deep and even thread cutting, all without having to touch the tool post. I find that sometimes a build series like this can get a bit dry and even a bit boring at times, so its good to throw in some other content. I'll be putting a short session together on 3D modelling, coding and 3D machining shortly on a curved spoked flywheel for a small Stuart Turner engine Emma from Emma's Spare Room is building.

Here's another interesting variant by ROBRENZ a master at his art.

Nigel

Quite interested in this tool, might just draw one up and give it a go. Looks a simple-ish tool, nothing too tricky.  Thanks Cam, and I enjoyed your You-Tube stuff that I've watched so far.

Chris

Edited By ChrisH on 04/11/2018 22:23:23

Just guessing, here, that Gary (Eccentric Engineering) taken on the diamond tool holder from the same gentleman who originally developed the tool discussed in this thread?

Perhaps he considers the tangential tool holder is a more universal tool, cheaper on sharpening and with better geometry for transferring cutting forces? Would a lump of carbide work in Gary’s tool holder, now that solid carbide cutters are now cheap enough for hobbyists?

Edited By not done it yet on 05/11/2018 09:56:45