Diamond Tool Holder

The Diamond Tool Holder (AKA Tangential Tool Holder) by Eccentric Engineering is a great tool for the amateur metalworking enthusiast. It's extremely simple to use and produces exceptional results.

[@davidapp3730]

My Diamond tool holder arrived a few months ago and I must say I am very impressed with the quality of the finish it produces. I have been grinding HHS tool bits for years but as I age my hand eye coordination is not what it use to be so I find the grinding fixture a great hwlp. A diamond hone to touch it up works great.

[@ShevillMathers]

I have two of these diamond (square) and a round one. They have a choice of HSS or bits with a Cobalt mix, which makes the bit much more wear resistant for cutting steal etc. A big plus is that to sharpen it only grinds one surface which also is much easier and the tool shape does not alter. All that happens is the piece of square or round only very slowly gets shorter-and using the grinding jig, it is perfect sharpen every time. I do put a small radius on the cutting tip using a very fine diamond hone (very cheap from China), I also just give the top ground surface a light finish hone, again with a very fine diamond hone. I use mainly a marine grade aluminium alloy used in ship building, fantastic stuff to work with also brass stock. The surface finishes are superb, works very well with nylon and other plastic stock that needs a very sharp tool for a good finish. There is less tool pressure on the workpiece too, so fewer ‘spring’ passes needed on hard materials in a small hobby lathe. A great product from all aspects. On the square (diamond) tool bit, I have the opposite end ground to suit fine metric thread cutting -0.75 and 1.0mm pitch, as a lot of adapters I make are camera lens adapters for my various home built telescopes. Southern Cross Observatory-Tasmania 42 South.

[@not2fast4u2c]

I'm new to learning about lathes and cutting bits but seeing it cutting cast iron that well was awesome to see It's the first time I have seen no chipping or dust as you said looks like a great tool for me if I buy a Nano Lathe I have been looking at It is small almost like a watch makers lathe is what it's compared to

[@RustyInventions-wz6ir]

Just found your channel and Subscribed. Very interesting. Nice work

[@brazilli0n]

Bay-Com Enterprises, Inc. in Interlochen, MI, has all these Diamond Toolholders in North America. It's as good as he says! Yes!

[@justtim9767]

Excellent video I have two of tool holder's and love them but never knew the theory about cutting.

[@DimaProk]

Sharpening tool bit is NOT 12 degrees in all directions as you say at 5:00. I made my own tool holder and without sharpening jig I set grinder table to 12 degrees and the tool came up perpendicular to cutting edge, that's because the tool is also tilted 12 degrees, I measured angle in screenshot from still at 2:30 in Photoshop and it's about 27 degrees. (12+15), so before all that measuring I figured I needed to double my angle and used 30 degrees on my table and it worked out beautiful. It cost me $6 dollars in mild steel to make two of them, one for round bits and one for square. I love this tool!

[@Rocky1234732]

I have used this type tool holder atleast 8 years. I purchased it from the folks at village press. You can actually cut towards the tailstock with some learnings.

[@55chevytruck]

Thanks for the tip! I never heard of this before.

[@retrosurfer1959]

I bought there smallest toolholder and am running it in a Taig micro lathe with very similar result especially in brass which is pretty amazing with a 1/8 inch square cutting tool. Best money ive spent on a tool in a long time and o ne of the best part even if you get brave or stupid and decided to make to big of a cut the tool slides down and away saving both the tool and the project.

[@thermion7869]

Very interesting video. Thank you for your time, look forward to more!

[@pmaci56]

Hi i brought the diamond tool holder for my 280 X 760 lathe and i think it's very good i also use the old style tool holders for finishing and leave the tangental for roughing Thanks Paul

[@nikolaishriver7922]

Right now I'm in the middle of a project making a 9" rotary table out of some big pieces of iron and a 60-1 worm gearbox i found from some kind of machinery. To see you get that kind of chip from cast iron is incredible. Just facing them off is taking hours on my little 10" Atlas. Its just pass after pass across these 10" crooked iron discs I swear were cast by some Neanderthal. I NEED this kind of tool. Re sharpening the edge of a hss would take like a minute. And I can barely get one facing pass without dulling one of my hss sharpenings. These iron chunks are so bad ive considered and tried for a moment using my angle grinder against the lathe to just get the surfaces calmed down a little. But the best way is just micro pass after micro facing cut pass. They're out of dial by about 1/4" on some spots. Ive burned through 3 carbide cutters I have and I finally mounted my air compressor nozzle for air cooling and its just blowing dust everywhere, but the bits are holding now. Good video and I'm definitely going to look into this company or make one for myself

[@richardh1198]

Hi i made my tool holder and my grinding jig both work very good, sure do like the way it cuts. my jig is 15deg might change it. but still works fine very good video haenrr

[@daywalker627]

Very nice holder. Thanks for sharing...

[@sgtfoxhound]

Tyler at 4:34 you show the grinder and jig ,what I have done with my grinder is attach a small piece of flat metal to the edge of the grinding rest closest to you "where your thumbs are resting" his takes away the chance of the grinding jig moving off its proper path as you move it past the grinding wheel to sharpen the tool bit , if the back edge of the sharpening jig is held against it and it set up so that the tool only has a few thou removed each time you will guarantee a 12 degree angle on the tool bit

[@ProjectsInMetal]

Thanks! I thought how it cut cast iron was pretty impressive as well. EccentricEngineering (the guys that sell the tool holder) have a new smaller one for mini lathes. Perhaps it's small enough for your lathe? Or (with a fair amount of effort) you could always make your own.

[@ProjectsInMetal]

I really like my diamond tool holder. I've never had to regrind the tool despite having used the tool for several projects. All I've had to do is refresh the edge occasionally with a diamond hone. I liked my RH tool so much I actually ordered a LH tool as well (which I use much less frequently, as you'd expect). The only thing I might do differently is order the new CROBALT HSS tools that Eccentric Engineering sells. I've heard good things, but I can't comment myself yet on crobalt.

[@CMAenergy]

Chatter is usually caused by something to lose or not strong enough causing flexing. If you slow your work down, There is no reason you cannot take a couple hundred thousands off in one cut. high speed cutting is usually used for fine cutting.

[@maximkatkov1732]

I saw the type of the tools in old machinist text book (North America around 30-s). That why it is not a surprise. But with modern technologies - i think they are past or good for hobbyists. I prefer to use carbide inserts - less dust from grinding in the air and always sharp.

[@thisnicklldo]

Always blunt?

[@ProjectsInMetal]

@daywalker627 Thanks! I've been really happy with it. Once you use one you'll use it 10 times more often than a conventional cantilever style tool holder.

[@davebarcelon]

nice tool holder thank you!!!!!

[@robotmotor]

thank you .. you help me !! i really need information for this tool and i got it

[@robertsalser848]

I just acquired one of these tool holders, I didn't get the sharpening jig, it uses 1/4" square tool bits. Could someone give me the correct angles to build one or tell me a good place to buy one. Thanks in advance.

[@ProjectsInMetal]

@J800613 I don't have any 4140 or anything else that's tuff or gummy to work with. I avoid difficult materials. I also have a smaller hobby lathe with a 1hp motor. So a 0.050 cut is pushing the limits on my machine, but not the limits of the tool. So even if I had more difficult to machine material I couldn't really take a more aggressive cut without bogging down my lathe. There should be other videos online that show a heavier cut. If not, write to the manufacturer. They might have more info.

[@J800613]

Hello, Could you post a heavy roughing cut in some gnarley steel and also with some tougher stock (4140)? DOC as far as you can?

[@CMAenergy]

IF you want to cut brass always use a back rake, never use a bit that cuts into it, or you could have a disaster You will or should never get chatter with a back rake on brass

[@born2flyau]

Tyler, Is the cutting steel in the "Diamond Tool Holder" standard 1/4 or 3/8 inch square High speed steel. or is it some specially size & shaped steel.

[@kencroft7933]

Your description of why it is called a tangential tool is not correct. If the tool tip is at centre height, the only way it can be tangential to the work is if the front face is vertical. Simple geometry. If the tool face is tangential and it is not vertical, the tip cannot be at centre height. The cutting angles of a so-called tangential tool are just the same as a properly ground conventional tool. The advantages are that some tangential tools are more rigid than a normal overhung tool, the user does not have to be skilled in grinding angles, and the tool can be sharpened simply and needing no skill. There are too many myths surrounding the tangential tool, which is actually not tangential at all. I use one on my mini lathe simply for the convenience of it.

[@luisivancordanoallende2428]

Cómo comprar...Lima Peru

[@The_Unobtainium]

It IS significant investment. After 20 years of manofacturing these things it's a shame they still treat it as something new and thus expensive. These things are cheap to manofacture!

[@seafax]

carefully chosen bad examples of setup to make this tool look far better than it actually is