Carbide tips

This topic has 7 replies, 5 voices, and was last updated 6 July 2016 at 14:00 by Split Pin.

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6 July 2016 at 11:49 #245615
Graham Lewis 1
Participant
@grahamlewis1
Hi,>>

I am very much a beginner and I need some help please. I bought some carbide tips tools a few months ago and I would like to buy some spare tips.>>

The size of the shank of my index tools is 7.5 mm square and the tips are triangular. The tips measure 8.58 mm from the base of the triangle to the tip. >>

I was told by an Ebay seller that I needed tips reference number TCMT 09 02 08. When they arrived the tips measure 7.49 mm not 8.58>>

Could somebody please tell me what the correct reference is for tips that measure 8.58 mm please?>>

Thanks>>

Graham>>
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6 July 2016 at 11:49 #8203
Graham Lewis 1
Participant
@grahamlewis1
Tips sizes
6 July 2016 at 12:41 #245619
JasonB
Moderator
@jasonb
Bit of an odd one that, the tips are usually measured along the length of an edge so your 8.58mm would equate to about 10mm but the common sizes for triangles are 09 as you were supplied and the next size up is 11 which would seem to be too big. unless your original tips had a very small corner radius as that code is for a large 0.8mm radius, have you tried them in the holder?

Did you get them from one of the ME suppliers? any code numbers on the existing holders or tips

Edited By JasonB on 06/07/2016 13:01:44
6 July 2016 at 12:44 #245620
MW
Participant
@mw27036
Hi Graham,

A photo would be a wonderful reference. I'm sort of new myself to the referencing system so i couldn't tell you what it is from the top of my head. I can't find it online but it's an ISO system for the letters and numbers.

Michael W
6 July 2016 at 12:59 #245621
JasonB
Moderator
@jasonb
How certain are you of your 8.58mm dimension?

A TCMT 11 02 08 would measure 8.73 base to tip but these are not ideal on hobby lathes as the tip radius is large and they wont take a fine cut, TCMT 11 02 02 or 11 02 04 would be better.

Edited By JasonB on 06/07/2016 13:14:19
6 July 2016 at 13:06 #245622
Clive Foster
Participant
@clivefoster55965
Graham

You should be measuring the cutting edge length not from base to tip. By my maths 8.58 base to tip translates to 9.9 mm cutting edge length. Allowing for tip radius that would be 10 mm cutting edge length. So the ISO standard number insert would be TCMT 10 02 08. Which doesn't exist! Nearest ISO sizes are 9 mm and 11 mm cutting edge length. You have a non ISO standard tip and holder set so you have to go back to the orignal supplier.

ISO tips and holders of the same nominal size are essentially interchageable between makes.

ISO standard holders should have a type number on the shank of the holder(s). If so it can be decoded to identify the tips its supposed to take. Its usually easier to work back from the holder number to tip size than to try and measure the tip itself. Especially if you haven't got a decent chart showing what the tip numbers mean and exactly where to take measurements. I found a good one from the Iscar catalogue, not got the link tho'.

Clive
6 July 2016 at 13:11 #245624
JasonB
Moderator
@jasonb
Page 452 & 453 are my usual ref charts
6 July 2016 at 14:00 #245626
Split Pin
Participant
@splitpin
A better way to find the tip size is to work out the diameter of the inscribed circle.

then the radius of the cutting point is i-material.

Simply measure from the edge of the tip to the edge of the hole and add half the diameter of the hole.

more info here

**LINK**

Steve
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