Boring Question

[CirclipParticipant @circlip]

And that’s the present “Have a free look” issue at the moment on the front of the forum.

[mgjParticipant @mgj]

Well I shall certainly have a look. (with my vast experience of tangential holders. Ha!), the only hassle I can see is to set an offset for a milling cut, which is hardly the most stressing of tasks. Yes, its a compound angle, so the tilt is set with a tilting table and the front clearance either by putting the tilting table on a rotary table, of just drawing up a template in card. Card seems like a lot less hassle.

 

Back to Ramon and FC3 cutters.  I have been a bit cavalier about chucking them away- in any case I do resharpen. Buy new, use on brass, resharpen use on steel.

 

The question is how good quality HSS are they. They seem very good, and given some of the monkey metal that has been passed off as HSS, I might well be a bit more open with the old tobacco tins.

 

Which will gain me points with Circlip too.

Edited By meyrick griffith-jones on 11/02/2010 18:03:27

[Ramon WilsonParticipant @ramonwilson3]

What a lovely bunch of chaps you are.

 

Thanks a lot for your posts. I’ve studied Mikes pictures (thanks for your offer Mike) and can see what needs doing so will check out the freebie article too. I see that the tool needs to be trapezoidal (spelling?) so I guess these are available – I think that now I really will regret not having access to all those grinders – just think of the bits that could have been made in a lunch hour! One of the chaps I worked with does have a 540 so perhaps if I offer to do the holders he will do the tool bits???

 

Careful now Merrick – you’re weakening   Personally I’ve never found the quality lacking on FC3, but I know what you mean about the monkey metal though. We had a buyer who thought she knew better – Clarkson ordered – ended up with such a cheap alternative that 16mm end mills could be ‘sharpened’ with a file – honestly! Totally unhardened. They were ‘nice and shiny’ though and above all of course “they cost much less” – ‘we’ won that one though ! Happy days

 

Thanks again – Ramon

[chris stephensParticipant @chrisstephens63393]

Hi Ramon,

The tool holder that Meyrick has takes plain ordinary 1/4″ square Cobalt HSS.

For those with half an ounce of intelligence all you need to know is that the tool leans left 12 degrees and forward 12 degrees and the tool is ground at 30 (60 included angle) degrees from opposite to opposite corner.

There are plans on the net, try Google-ing “tangential tool holder”  that’s how I got the info to build my first one, some years ago. I have since redesigned the thing to hold the tool bit even more firmly, using my simple square hole technique, but that is for another time.

chriStephens

PS If Meyrick can be persuaded away ( even temporarily) from his beloved carbide tips, there must be something to these holders. 

PPS If you have been  thinking about making a Tangential holder, go ahead and spend the time to do it, you will not regret it. Ain’t that right MGJ?

Edited By chris stephens on 11/02/2010 19:32:34

[Michael Cox 1Participant @michaelcox1]

Ramon, the tool in the tangential holder is ordinary square tool steel. The tool is ground 30 degrees across the diagonal which makes the front face a right paralellogram.

Mike

[mgjParticipant @mgj]

I have them made for me. I shall be issuing a “By appoinment to” sticker.

 

Chris, you are quite right – once you have the 12 and 12 that is all you need to know, and that was what I was looking for. The only other wrinkle is the height for the clamp screw so it doesn’t foul a facing cut.

 

I use that holder exclusively on the big lathe. Apart from the occasional time I need a specific large nose radius, that’s the tool I use. I can vouch for the 1/4 square toolbit, which would be easier to come by than oblong – or trapezoidal to some.

 

(And for those who are going to have a go, don’t forget you are cutting the SPACE, so the blank has to be tipped such that the BOTTOM of the slot is UP by 12deg under the cutter. Then when you put it in the tool holder the TOP will be 12deg nearer the work.(thicker) No mirror images please. With apologies to the ancient and decayed Grannies)

[Ramon WilsonParticipant @ramonwilson3]

Yes “I can see clearly now” what you mean – it was that first image of Mikes plus the fact that I was visualising the tool being held vertically in both planes. The article in the sample issue gives all and as I do have some 1/4 square HSS and plenty of steel  theres no excuse. Back on this one (sooner, rather than) later!

 

My thanks again guys – Ramon

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