Author Topic: Getting the most out of Carbide Inserts  (Read 21631 times)

Offline Darren

  • Madmodder Committee
  • Hero Member
  • *****
  • Posts: 3795
  • N/Wales
Re: Getting the most out of Carbide Inserts
« Reply #25 on: May 22, 2009, 01:29:26 PM »
Just can't rely on some peeps eh  :poke:

 :lol: :lol: :lol:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

bogstandard

  • Guest
Re: Getting the most out of Carbide Inserts
« Reply #26 on: May 22, 2009, 02:30:05 PM »
I have seen somewhere where a chap mounted a 4" diamond cutting disc sandwiched up with his normal off hand grinding wheel, you know the sort of thing, take the nut off, slip on the cutting disc, put the nut back on.

He could then use the grinding wheel almost as normal, and on the side he had a diamond disc for harder stuff.

John

Offline CrewCab

  • Madmodder Committee
  • Hero Member
  • *****
  • Posts: 851
Re: Getting the most out of Carbide Inserts
« Reply #27 on: May 22, 2009, 02:38:17 PM »
Does anyone sell larger ones, say 50mm dia?  :thumbup:

How about These

CC

Offline Darren

  • Madmodder Committee
  • Hero Member
  • *****
  • Posts: 3795
  • N/Wales
Re: Getting the most out of Carbide Inserts
« Reply #28 on: May 22, 2009, 02:45:05 PM »
I have seen somewhere where a chap mounted a 4" diamond cutting disc sandwiched up with his normal off hand grinding wheel, you know the sort of thing, take the nut off, slip on the cutting disc, put the nut back on.

He could then use the grinding wheel almost as normal, and on the side he had a diamond disc for harder stuff.

John

What a neat idea, I have a 9" one on my big angle grinder, amaizing what it will cut through. But I think I'd better not mount that one up  :lol:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

bogstandard

  • Guest
Re: Getting the most out of Carbide Inserts
« Reply #29 on: May 22, 2009, 02:51:29 PM »
Dave,

They are really specialist wheels, and need water really to do a good job. If used for hand grinding they will soon go out of shape and be ruined. Not really viable for what you are trying to achieve here.

I have a project for later, to use one of those for putting life back into carbide tips. But very specialised.


John

Offline Stilldrillin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4938
  • Country: gb
  • Staveley, Derbyshire. England.
Re: Getting the most out of Carbide Inserts
« Reply #30 on: May 23, 2009, 02:12:51 AM »
CC,

Thanks for the link. I have used that type of wheel, in a toolroom, long ago.  ::)

They`re now a little specialised for my present purposes....... 

My thoughts were for a disc on a mandrel, to be slipped into the chuck when necessary......

John`s grinder mounting idea is a good `un too........ Hmmmm......  :scratch:

David D

David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline kvom

  • Hero Member
  • *****
  • Posts: 520
Re: Getting the most out of Carbide Inserts
« Reply #31 on: May 23, 2009, 07:32:45 AM »
It so happens that in my current CNC lathe class we had a long discussion about carbide inserts.

The reversible type, with no rake, are generally held in a tool holder with a raked head giving a 3-5 degree angle.  If you were to mill your holder slots at a similar angle they might work even better.

The other important factor is that the insert must be clamped to the holder very securely.  Any movement while cutting will result in a chipped insert.  Your holders look very snug.

Offline klank

  • Full Member
  • ***
  • Posts: 128
  • Sunny East Devon
Re: Getting the most out of Carbide Inserts
« Reply #32 on: May 29, 2009, 12:28:54 PM »
I appreciate that this thread is a bit old now, but as still somewhat a novice, I wanted to say thanks to Darren and Boggy for their help in explaining how to do this and what materials to use.

I have wanted to extend my somewhat modest collection of replaceable tip carbide tools for some time, but funds do not permit buying them new.

I got a set of 10 X 11mm Sandvik tips (TNMG 11 03 08-QM) from fleebay (a bit more 'spensive than Darren's)



and some lengths of 10mm keysteel from the source that Boggy recommended - very reasonably priced.

The keysteel machines beautifully - excellent value.

The screw hole in the carbide tips is only 2mm and I felt it too weak to drill/tap the keysteel for this, so after milling out for the tip, I "pinned" the tip hard against the milled step with a flush stainless steel 2mm peg and fabricated a step clamp from a scrap of old black steel I had in the bin-box, using an M4 skt. head bolt. I machined a thin step on the back end of the clamp step so as to fit in a slot filed on the keysteel to stop the clamp swivelling when doing up the bolt.
The result is not pretty to look at, but as a sort of "trial" it works a treat.



I tried it on a length of rusty old 50mm bolt from a scrapyard - it cut cleanly with no judder - provided the speed was kept up (800rpm).

Thankyou for the info

Offline Stilldrillin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4938
  • Country: gb
  • Staveley, Derbyshire. England.
Re: Getting the most out of Carbide Inserts
« Reply #33 on: May 30, 2009, 10:13:08 AM »
Look what I got from Chesterfield market!

50mm dia diamond discs........  :ddb: :ddb:




The stallholder got them in special, after I had asked about them last week.  :clap:

That will do nicely!  :thumbup:

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline sbwhart

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 3522
  • Country: gb
  • Smile, Be Happy, Have Fun and Rock Until you Drop
Re: Getting the most out of Carbide Inserts
« Reply #34 on: May 31, 2009, 06:14:39 PM »
Look what I got from Chesterfield market!


Have they got that Spire untwisted yet  :lol:

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline Stilldrillin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4938
  • Country: gb
  • Staveley, Derbyshire. England.
Re: Getting the most out of Carbide Inserts
« Reply #35 on: June 01, 2009, 02:06:25 AM »
Have they got that Spire untwisted yet  :lol:

Stew

Nah!

We`ve given up on it now.......  :scratch: ::)

I have a regular smile at tourists with cameras. Groups of Orientals are very entertaining, and polite!

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline sbwhart

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 3522
  • Country: gb
  • Smile, Be Happy, Have Fun and Rock Until you Drop
Re: Getting the most out of Carbide Inserts
« Reply #36 on: June 02, 2009, 03:02:42 AM »
For those of you who are mistified about Chesterfield spire follow this link.

http://images.google.com/images?sourceid=navclient&rls=GGLG,GGLG:2006-51,GGLG:en&q=chesterfield+spire&um=1&ie=UTF-8&ei=As4kSti-Cpi6jAeXh-HfBw&sa=X&oi=image_result_group&resnum=1&ct=title

It would be real cool if they fitted a nut to it  :lol:

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline rleete

  • Madmodder Committee
  • Hero Member
  • *****
  • Posts: 534
  • Country: us
Re: Getting the most out of Carbide Inserts
« Reply #37 on: June 02, 2009, 07:05:00 AM »
It would be real cool if they fitted a nut to it 

Now that would be funny.
Creating scrap, one part at a time

Offline Stilldrillin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4938
  • Country: gb
  • Staveley, Derbyshire. England.
Re: Getting the most out of Carbide Inserts
« Reply #38 on: June 02, 2009, 08:18:57 AM »
It would be real cool if they fitted a nut to it 

Now that would be funny.

Not if you needed to drive past regularly. ::)  :wave:

Everyone looks upwards at it now..........  :scratch:  :D  :lol:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!