Double diamond tool

G'day Nigel, yep Robin is certainly a master of his art and does everything to the absolute degree. Amazing to watch his work, miles above anything I can do in my little show.

Cam

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

Hi

This is a slight digression from the Double Diamond tool however I did mention a Hirth Coupling. Below is a link to a calculator that gives the tool approach angle to umpteen decimal places and the height of the teeth for a given diameter and number of teeth.

A good video of making one with a fly cutter.
https://www.productionmachining.com/blog/post/video-making-a-hirth-coupling

I have not tried it yet but I think I will add this one to my list.

Regards
John
 

(Alpha version as noted by the Author)
>**LINK**

Edited By John McNamara on 05/11/2018 01:09:55

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

HI

Solid carbide is rather brittle it needs to be brazed to a softer steel support.

As it happens I have two of Gary's holders one is fitted with the standard high speed steel tool, the other is fitted with an insert made from a piece of key steel with a square cut out of one corner along its length. I made the cut out to match a small carbide shank drill, (it was a circuit board drill very hard fine grain carbide). I silver soldered this into the cut out. I also ground the sides down to reduce the nose radius.

This created a very positive rake tangential tool that fitted perfectly into the holder.

This tool is handy for turning hard materials that High speed steel can't handle.

Regards
John

I was thinking of, for instance, a solid cabide end mill shank for a round cutter. Holding, on what might well be contact points only, might be a problem as clearly they are more designed for clamping in the likes of ER collets?

As for square I dont know, but with cutting forces down the length of the cutter contiuous cuts would present little problem provided the cutter did not slip in the holder.

Perhaps not needed if the crobalt cutters are as good as Gary suggests?

Yes, Carbide works fine in a Tangential tool. They used to regularly snap carbide end mills where I used to work so I sharpened one for my Eccentric tool holder and it works well with hard stuff like the crust on cast iron.

Carbide do everything that HSS can.Almost

**LINK**