Author Topic: trepan tool?  (Read 587 times)

Offline celsoari

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trepan tool?
« on: May 24, 2020, 05:28:23 PM »
Hello friends, does anyone have experience in building (DIY) the trepan tool (drill)?
Greetings from Brazil

Offline WeldingRod

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Re: trepan tool?
« Reply #1 on: May 26, 2020, 05:46:06 PM »
I've got a val-cut and I've also ground tools to do it.  VERY useful!
Do you need photos?

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Offline BillTodd

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Re: trepan tool?
« Reply #2 on: May 31, 2020, 04:33:25 AM »
Here's a few pictures of a carbide trepanning insert , they may help with the cutting geometry.
Bill

Offline Joules

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Re: trepan tool?
« Reply #3 on: May 31, 2020, 06:49:29 AM »
Bill, does that tool have a tendency to dive towards the centre of the hole ?  Quite aggressive rakes on the tip, something I should really have a play with, what are the tip dimensions hard to judge scale from the pictures.
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Offline mattinker

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Re: trepan tool?
« Reply #4 on: May 31, 2020, 06:55:04 AM »
Celsoari,

How big a trepanning tool? https://www.youtube.com/user/userwl2850 does some amazing deep hole drilling!

Regards, Matthew

Offline BillTodd

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Re: trepan tool?
« Reply #5 on: May 31, 2020, 07:31:49 AM »
Bill, does that tool have a tendency to dive towards the centre of the hole ?  Quite aggressive rakes on the tip, something I should really have a play with, what are the tip dimensions hard to judge scale from the pictures.

It's about 3mm groove and about 30mm deep , total length about 65.

Can't say I've noticed it dive in any particular direction ,it is solid carbide.
Bill

Offline BillTodd

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Re: trepan tool?
« Reply #6 on: May 31, 2020, 07:45:23 AM »

Celsoari,

How big a trepanning tool? https://www.youtube.com/user/userwl2850 does some amazing deep hole drilling!

Regards, Matthew

Neat8-) remined me that broaching cutters are also trepanning tools and another useful option for making big holes
Bill

Offline Joules

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Re: trepan tool?
« Reply #7 on: May 31, 2020, 08:07:02 AM »
Cheers Bill, I thought just the tip was carbide.  Nice link Matthew, he was just down the road (a bit) from us, wish I could have seen his place before he wound it up, real shame.
Honour your mentors, and pay it forward.

Offline WeldingRod

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Re: trepan tool?
« Reply #8 on: June 01, 2020, 09:06:10 AM »
The fancy trepanning tools are run well below centerline, if I remember correctly, and the whole insert is slanted down a lot.  Very funny looking.  I didnt see any dig in issues, even on delrin.

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