Plans wanted for Carbide Tip inserts tool holders

[Jors]

I have seen one or two projects of fabricating your own Carbide Tip Inserts Tool Holders. Some of them was just flat (positive rake bit), but some of them specify for the tip to be on an angle (negative rake tip) to determine the rake.
I would like to get hold of some of these plans to make some myself.

Normally the tool holders are so expensive that a hobbyist can not afford them.

I have even welded the tips off some concrete drill bits and brazed them on square rods and that also seems to work as a cheap alternative.

I am also looking for info on boring bars.

I have even seen a plan how someone made a cut-off blade from a piece of saw blade on which there was a TCT, but I lost it.

[Dave J]

Hi Johan, and welcome to the forum.
It will depend on what tips you have. Have you tried CTC tools for your holders? they are reasonably cheap
CTC Tools Home Page (http://www.ctctools.biz/servlet/StoreFront)
I have not seen any plans but have seen some that guys have made. I remember seeing the saw blade used as a parting tool as well, though like you I am not sure whee I saw it.
From what I remember you just cut a part of the blade so the tip has little or no rake.

Dave

[Jors]

I have a cheap set, but the tips chip like butter.
I have used some better quality tips and no breakages in a very long time.
However they are quite expensive and the tool holders are even more expensive. I would rather use a certain amount for a couple of tips and make my own holders (different styles), than only buy one holder with a tip.
I am only looking for more ideas and will post my results and failures.

[Stustoys]

Hi Jors
Took me awhile but I found it.

http://www.cnccookbook.com/MTMillDovetail.htm (wlmailhtml:{39BAE3B7-E875-4F82-BDF9-3DD0A594E2BB}mid://00000431/!x-usc:http://www.cnccookbook.com/MTMillDovetail.htm)
You may want to read the least couple of paragraphs first under "Thoughts and Tidbits for Future Cutters and Other Would-be Cutter Makers..." It makes an interesting point about the accuracy needed if you choose to use more than one tip.
Good luck

Stuart

[eskimo]

here is one that I found following a link from another post

[19brendan81]

I made a boring bar which uses the triangle inserts. Works a treat and was an easy project. Im not sure if i fluked the angles or what but it cuts very well.

Does anyone know what the advantages of those diamond shaped carbide bits are? Seems strange to design a bit which wastes two cutting edges.

Brendan

[pipeclay]

If the Tip is in the TCMT family it will have 3 cutting edges.

Can you explain how your other 2 edges are wasted?

[19brendan81]

Diamond inserts (CCMT) have two 80 degree edges and two 100 degree edges. They only fit in the tool holders one way, so the 100 degree edges are wasted as you cant use them unless you insert them in a different tool holder.

Seems stupid when the Triangle and square inserts can be indexed in their respective tool holders for all their cutting edges.

[pipeclay]

Sorry I read that as Triangular.

[Blu_Rock]

Here is a link for making a TCMT holder - Steve Bedair's 9 x 20 Site (http://bedair.org/Carbide/tool2.html)

Also, an intersting post on making a tangental HSS tool holder - The Home Machinist! • View topic - Things were slow at work today. (http://www.chaski.org/homemachinist/viewtopic.php?t=80937)

[Jors]

Blu_Rock,
Thanks,
This was what I was looking for. I have bought 4 triangular bits (Seco, I think it was TPM3000 if my memory serves me still). They are bigger that the 12mm shafts I am going to use, but no problem. They are positive so I do not have to mount them at an angle. I choose them because of availability and because they can do various steels as well as interrupted cuts. Little expensive.

I am photographing everything and as soon as I get web space (still looking for free space) I will post everything in detail. I will also post an article to make your own cemented (brazed) TCT tool with a cheap source of durable tungsten tip.

[Dave J]

Blu_Rock,
I am photographing everything and as soon as I get web space (still looking for free space) I will post everything in detail. I will also post an article to make your own cemented (brazed) TCT tool with a cheap source of durable tungsten tip.

You can post them up here no problem, plenty of room:2tsup:

Dave