Thread: Diamond Tool Holder

Originally Posted by bwal74

Hi,

I just bought my birthday present. A 12mm DTH set with a extra Cobalt piece. My missus had no objections as it was her birthday earlier this month and I spent up big on her (6 p's or something??).

Cheers Ben.

Happy birthday Ben, be good if you could give use some feedback on how you like the new tool.

Hi,

I received a email from Gary suggesting I measure my toolholders. Lucky I did, wouldn't of held a 12mm DTH Changed my order to a 9.5mm. Had a long day.

I am looking forward to posting some comparisons.

Cheers Ben.

Originally Posted by bwal74

Hi,

I received a email from Gary suggesting I measure my toolholders. Lucky I did, wouldn't of held a 12mm DTH Changed my order to a 9.5mm. Had a long day.

I am looking forward to posting some comparisons.

Cheers Ben.

But Bruce said 12mm fits his Hercus 260? - which is what you have?

Jordan

Fred I would suggest you buy the tool as its a good option to most others. I grind my own HSS stuff but this tool is great and as it uses 1/4" HSS its a cheap runner. I still use other HSS tooling but usually ground for specific jobs and my carbide stuff gets dragged out if I have some roughing deep cuts.
Pete

Originally Posted by nadroj

But Bruce said 12mm fits his Hercus 260?

Same here.

Hi,

I put a QCTP on my Hercus from AMWH, and the toolholder slot is 14mm so a 12mm DTH won't fit. This is what Gary emailed to me:

Usually owners of Hercus 260s purchase the 9.5mm tool holders but it does also depend on what type and size of tool post you are using. The 9.5mm tools have a shank that is 12.7mm (1/2”) high and the 12mm tools have a shank that is 15mm high. Just check that you can fit the bigger shank in your QCTP holders before I send your order.

When I was looking at some carbide tooling I did measure the slot but I guess I got mixed up in what I was buying etc. I'm glad I did recheck (you know when you hear that little voice in your head?).

Ben

As I said in my inital reply to you Ben, I was confused by the Eccentric website and put it in the "too hard" basket at the time.

The number of replies and differing opinions on the correct size so far indicates that I wasn't an orphan.

Your quote from Gary's email does clarify it to some extent, but it makes you wonder why you would call a tool 12mm if it is 16mm?

Originally Posted by jack620

Same here.

Reconfirming....
The Hercus 260 Square Toolpost (4 way indexable type that came with my new lathe) has a 25mm high gap to clamp various toolholders.
The Diamond Toolholder I have has a shank 15mm high & is called a 12 mm toolholder ( dont know the reason for this)
This 12mm Diamond Toolholder accepts a 1/4" square HSS or Crobalt toolbit.
Hope this is of assistance.
regards
Bruce

Hi boys,
12mm would refer to the optimal height from the bottom of the shank to the tip. Just like a carbide insert parting tool can be 25mm high but have a cutting height of 16mm.

Cheers,
Ew

Originally Posted by Abratool

Reconfirming....
The Hercus 260 Square Toolpost (4 way indexable type that came with my new lathe) has a 25mm high gap to clamp various toolholders.
The Diamond Toolholder I have has a shank 15mm high & is called a 12 mm toolholder ( dont know the reason for this)
This 12mm Diamond Toolholder accepts a 1/4" square HSS or Crobalt toolbit.

I assume its tool height. Its designed for lathes that are 12mm from the bottom of the shank to center height.
My 4 way has a 25mm slot with a 14mm tool height.

Originally Posted by Steamwhisperer

just love the speed and economy of resharpening tangential tools. Besides, tangential tools have been around for close to 100 years so they can't be too bad.

So if they are so good why don't you see them in industry?*(well ok "why didn't we?", time and cutters have moved on just a little in industry)

I can come up with a few ideas but only one seems a show stopper.

1. "That's the way we have always done it"
2. Two of the tool angles are fixed(though one could be made adjustable if it was really needed and if you had to have a couple of different holders industry wouldn't care so much)
3. They take up to much room?
4. They are more likely to slip above say 3hp?
5. They wouldnt be great for form cutters

Anyone got any better ideas?

Stuart

*p.s. I'm not having a go at them.... I'm just wondering if there is something I'm missing

Originally Posted by bwal74

Hi,

I put a QCTP on my Hercus from AMWH, and the toolholder slot is 14mm so a 12mm DTH won't fit.

Ben

OK, I lose track of what's fitted to who's lathe, so it didn't register that you had a non-standard toolpost.
So, the 12mm DTH won't fit in your 14mm slot, because 12mm refers to a different dimension than the shank, which is actually 15mm, if I got that right.

Having used an Indian made Dickson type toolpost for some time now, I think I'll try going back to the standard 4 position TP for this lathe. I want to be able to use a gooseneck parting tool holder, which comes with a tall shank. A diamond tool holder could partly compensate for the loss of shimless height adjustment.

Thanks,
Jordan

HI,

I went back and had another look at the Eccentric site, I totally missed the shank size. It's on the product info tab on the shop tab. It's easy to get confused by the DTH name. Also found this: Minimum tool height - 9.5mm (3/8") explains the naming. I'm just glad Gary was following this thread and I on my order I specified what machine I had. Good customer service.

I wish I had off ordered them on Monday though. Looking forward to using them.

Ben

Originally Posted by Stustoys

So if they are so good why don't you see them in industry?*(well ok "why didn't we?", time and cutters have moved on just a little in industry)

I can come up with a few ideas but only one seems a show stopper.

1. "That's the way we have always done it"
2. Two of the tool angles are fixed(though one could be made adjustable if it was really needed and if you had to have a couple of different holders industry wouldn't care so much)
3. They take up to much room?
4. They are more likely to slip above say 3hp?
5. They wouldnt be great for form cutters

Anyone got any better ideas?

Stuart

Hi Stuart,
have a look here
ISCAR Cutting Tools - Metal Working Tools - Iscar Catalog : ISO-Turning - Ext. 100° diamond, face 75°app

Phil

Originally Posted by Stustoys

................................................
I can come up with a few ideas but only one seems a show stopper.

1. "That's the way we have always done it"
2. Two of the tool angles are fixed(though one could be made adjustable if it was really needed and if you had to have a couple of different holders industry wouldn't care so much)
3. They take up to much room?
4. They are more likely to slip above say 3hp?
5. They wouldnt be great for form cutters

Anyone got any better ideas?

Stuart

*p.s. I'm not having a go at them.... I'm just wondering if there is something I'm missing

Stuart,

maybe
6. need constant re-adjustment of center height?
or
7. really too expensive just for a simple HSS tool holder?

On the plus side, I like that it is Australian made. And it looks well made.

It could have been a great success 50 years ago....

.... hmmm, maybe not, have a look at this from 1879:
http://vios1.rdg.ac.uk/olib/images/n...2_b657/005.jpg

or this from 1882:
http://vios1.rdg.ac.uk/olib/images/n...2_b648/004.jpg

They did all not succeed, they never really became the popular universal tool. Not in all the past 134 years. Why should the tangential tool now suddenly become popular? I think it has something to do with recent advertising in model engineering magazines.

Chris