Double diamond tool

Hi All

I stumbled on this post on You Tube **LINK**

Cam at battler is an Australian you tuber that does some pretty impressive work, in this case a slotter. It would make a great series for MEW

**LINK**

An interesting shop built lathe tool, easy to make too.

Regards
john

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

Apologies, but couldn't resist it. I'll get my coat!

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

Off to draw that up. Thanks

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...

If set up as he mentions with different tips it saves one quick change holder, It perhaps could be used as a way of doing quick changes itself. It would be a great way to interchange screwcutting tips without having to have a complete qctp holder for each one.

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

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It's worth watching the video that 'peak4' linked, Neil

MichaelG.

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! 😊

Hi All

Another variation on the theme
Ball indexing added, a kind of Hirth coupling it will be very accurate.

**LINK**

https://www.google.com.au/search?q=hirth+coupling&rlz=1C1ASUT_enAU791AU791&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi7up7-5bneAhUFNo8KHSIKAnIQ_AUIDigB&biw=838&bih=501

Regards
John

Edited By John McNamara on 04/11/2018 03:30:15

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

G'Day all, my name is Cam, just joined but look in from time to time as a casual observer. I posted the YouTube video on the multi angle tool holder that I purchased a number or years ago. I had some comments that there was interest asking for some more infomation so if you have any questions ping back to me.

Cam

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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.

How is a tool with Diamond Inserts a "Slotter" ?

For anyone with a big lathe having a tool-holder mounted on a tool-holder is a (very) limited alternative to a rear tool post, but a rear tool post is a far more useful and capable option, especially with matching front & rear QCTPs.

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

MichaelG.

Hi Cam. Welcome to the forum. I follow your channel. Very interesting. See you on Emma's live show chat sometimes.

regards

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.

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Thanks for the detail, Cam

MichaelG.

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

Nigel