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Gallery, Projects and General => How do I?? => Topic started by: celsoari on May 24, 2020, 05:28:23 PM

Title: trepan tool?
Post by: celsoari on May 24, 2020, 05:28:23 PM
Hello friends, does anyone have experience in building (DIY) the trepan tool (drill)?
Title: Re: trepan tool?
Post by: WeldingRod 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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Title: Re: trepan tool?
Post by: BillTodd 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.
Title: Re: trepan tool?
Post by: Joules 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.
Title: Re: trepan tool?
Post by: mattinker 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
Title: Re: trepan tool?
Post by: BillTodd 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.
Title: Re: trepan tool?
Post by: BillTodd 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
Title: Re: trepan tool?
Post by: Joules 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.
Title: Re: trepan tool?
Post by: WeldingRod 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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