Miniature Boring bits

[VicParticipant @vic]

Anyone used these? They were given to me so I thought I’d make a simple holder for them. I don’t want to waste too much time making it though as I suspect they won’t last long with me behind the feed handle 😂

[JasonBModerator @jasonb]

I was given a few similar ones though they have a different shank profile. Made a simple holder and they work well, I use the internal grooving ones quite a bit.

[PlasmaParticipant @plasma]

<p style=”text-align: left;”>I have a set of them and I’ll grab a snap in a bit to show the holders.</p>
Very good for the small boring jobs I get occasionally.

 

[bernard towersParticipant @bernardtowers37738]

yes they look like Horn bits and they work really well like Jason the recess ones are very handy. My holder is made by drilling/millig two holes at the correct distance then filing out most of thr excess and using a broken tool as broach clean out the rest and have a grubscrew at an angle to keep things still. sorry about the scarf but they get used.

[old martParticipant @oldmart]

We have hundreds of them at the museum, about 20 Iscar that I bought years ago and the rest were Sandvik, brought in by Gary, boring, grooving and threading. All the same style shanks as Jasons. I have added Densimet tungsten shanks to some to use in the mill boring head as well as in the lathes. We can bore down to about 4mm diameter.

[VicParticipant @vic]

Thanks for the replies, I’ll make something up for them.

[Wade BeattyParticipant @wadebeatty78296]

Here is a thread from a German forum with dimensions and various ways to hold the Horn 105 system bits. I have a couple hundred of them I bought used but re-sharpened, they are very handy

Most browsers have an autotranslate option that works quite well.

https://forum.zerspanungsbude.net/viewtopic.php?f=59&t=44478

and a .pdf of holders at:

http://herbert-schmitz.net/Zerspanungsbude/Horn.pdf

Wade

[Speedy Builder5Participant @speedybuilder5]

Peculiar dimensions on the inscribed diameter eg 2.467mm and 4.771mm ??

Bob

[JasonBModerator @jasonb]

The scaling of the photo is probably a bit off which gives those numbers, the second link gives 4.8mm and 2.5mm for the hole so may also be some clearance as it is the two flats that make contact. Had they been US made I might have said 3/32 and 3/16

[Pete RimmerParticipant @peterimmer30576]

I have a beautifulboring and facing head for my mill that takes 10mm shank tooling. I’ve yet to use it so if anyone has a source for 10mm boring head inserts please let me know.

[JasonBModerator @jasonb]

You can get these tools with round shanks which would then just need a simple sleeve. Possibly drill the sleeve side so the grub screw bears on the tool.

[jimmy bParticipant @jimmyb]

I have loads of these bits for boring, threading and grooving. We used stacks of these at work, the used ones found their way home, just needing a tickle up with a CBN wheel.

 

I milled the profile (badly but it worked OK…) in some holders.

I did a bit better job for some other inserts…

 

 

jimb

[Wade BeattyParticipant @wadebeatty78296]

Horn might also have made thier tooling with odd dimensions to make their tooling holders neccesary for big clients.

[Howard LewisParticipant @howardlewis46836]

Pete Rimmer, having had brazed carbide tip boring tools chip in my Boring head, (For 1/2″ shank tools)

I have bought an ordinary lathe 8 mm boring bar for replaceable carbide tips (CCMT0604)  and made a split sleeve to fit the shank into the head. having aligned the bar by eye, so far the results have been satisfactory,

Have yet to try out the 10mm one, but live in hopes.

At least , if I have a disaster, the tip is easily replaceable!

Howard

[old martParticipant @oldmart]

I took a picture of some that had been fitted to Densimet (tungsten) shanks to be used in the mill boring head, they are Loctited in so they will be easy to replace if needed. We have all the sizes of holder for the lathes, they use grub screws to hold the mini bars.

[Howard Lewis]

On Howard Lewis Said:

Pete Rimmer, having had brazed carbide tip boring tools chip in my Boring head, (For 1/2″ shank tools)

I have bought an ordinary lathe 8 mm boring bar for replaceable carbide tips (CCMT0604)  and made a split sleeve to fit the shank into the head. having aligned the bar by eye, so far the results have been satisfactory,

Have yet to try out the 10mm one, but live in hopes.

At least , if I have a disaster, the tip is easily replaceable!

Howard

Yes, I also use SCLCR boring bars (for 6mm inserts) in my BH, have a couple with varying amounts chopped of the shank with a disc cutter so that I can choke them up – historically I’ve had a couple of cheapy bars that were a bit ‘ringy’ and ideal for repurposing in this way.

There’s a huge range of CC**0602** inserts cheaply available including ones made specifically for boring – some of these give really good results..

[HollowpointParticipant @hollowpoint]

I have about a dozen of these. They are particularly useful for use on very small lathes. Such as my Cowells. 🙂

[Neil LickfoldParticipant @neillickfold44316]

The one with through coolant, you can hook up a small hose to the end and run some low pressure compressed air through it. It will make a difference to the life of the tool too.

 

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